<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:9ee7e5ec-3a64-4a11-91d6-027673f1fa5d,g:7c4f8b97-0956-4348-b44c-c2451f15fb0c-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.pnfp.com/role/DocumentandEntityInformation" xlink:type="simple" xlink:href="pnfp-20250930.xsd#DocumentandEntityInformation"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/DocumentandEntityInformation" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_abbd1f28-391d-4c1d-8594-d1358c0d8f05" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_ae5b5b26-b364-416a-ac0e-a595ff336d3e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_abbd1f28-391d-4c1d-8594-d1358c0d8f05" xlink:to="loc_dei_DocumentInformationTable_ae5b5b26-b364-416a-ac0e-a595ff336d3e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_e1bf6047-8c66-40d0-8dc6-bbdaaeebeeb4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_ae5b5b26-b364-416a-ac0e-a595ff336d3e" xlink:to="loc_us-gaap_StatementClassOfStockAxis_e1bf6047-8c66-40d0-8dc6-bbdaaeebeeb4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_e1bf6047-8c66-40d0-8dc6-bbdaaeebeeb4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_e1bf6047-8c66-40d0-8dc6-bbdaaeebeeb4" xlink:to="loc_us-gaap_ClassOfStockDomain_e1bf6047-8c66-40d0-8dc6-bbdaaeebeeb4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_7e87f9a1-956e-4839-a1c0-23ba604cb92b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_e1bf6047-8c66-40d0-8dc6-bbdaaeebeeb4" xlink:to="loc_us-gaap_ClassOfStockDomain_7e87f9a1-956e-4839-a1c0-23ba604cb92b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncumulativePreferredStockMember_1b98c69d-ea9a-457e-acb7-2c529a018ac3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncumulativePreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_7e87f9a1-956e-4839-a1c0-23ba604cb92b" xlink:to="loc_us-gaap_NoncumulativePreferredStockMember_1b98c69d-ea9a-457e-acb7-2c529a018ac3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_71088707-3cab-407b-ba58-cf2645c201b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_7e87f9a1-956e-4839-a1c0-23ba604cb92b" xlink:to="loc_us-gaap_CommonClassAMember_71088707-3cab-407b-ba58-cf2645c201b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_d4b651ef-6c60-453f-8daa-1ead175c19a9" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_abbd1f28-391d-4c1d-8594-d1358c0d8f05" xlink:to="loc_dei_Security12bTitle_d4b651ef-6c60-453f-8daa-1ead175c19a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_dc08f241-c26e-4948-9c2c-f381f216914c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_abbd1f28-391d-4c1d-8594-d1358c0d8f05" xlink:to="loc_dei_TradingSymbol_dc08f241-c26e-4948-9c2c-f381f216914c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_19191431-5f6a-4934-a145-4792a8287b24" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_abbd1f28-391d-4c1d-8594-d1358c0d8f05" xlink:to="loc_dei_SecurityExchangeName_19191431-5f6a-4934-a145-4792a8287b24" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_6aba09d0-60d7-47d9-864a-60590d4af1f0" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_abbd1f28-391d-4c1d-8594-d1358c0d8f05" xlink:to="loc_dei_EntityShellCompany_6aba09d0-60d7-47d9-864a-60590d4af1f0" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/CONSOLIDATEDSTATEMENTSOFINCOMEUnaudited" xlink:type="simple" xlink:href="pnfp-20250930.xsd#CONSOLIDATEDSTATEMENTSOFINCOMEUnaudited"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/CONSOLIDATEDSTATEMENTSOFINCOMEUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_b5286d85-6c1b-4906-8fff-1dc863f73533" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_676e7bc4-4cdc-4f33-8899-4ce2a833f4b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_b5286d85-6c1b-4906-8fff-1dc863f73533" xlink:to="loc_us-gaap_StatementTable_676e7bc4-4cdc-4f33-8899-4ce2a833f4b9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_7e233265-2be0-432a-a72f-a1645116b6a8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_676e7bc4-4cdc-4f33-8899-4ce2a833f4b9" xlink:to="loc_srt_ProductOrServiceAxis_7e233265-2be0-432a-a72f-a1645116b6a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_7e233265-2be0-432a-a72f-a1645116b6a8_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_7e233265-2be0-432a-a72f-a1645116b6a8" xlink:to="loc_srt_ProductsAndServicesDomain_7e233265-2be0-432a-a72f-a1645116b6a8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_c137faa1-1329-4475-b7d9-26c8a8440387" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_7e233265-2be0-432a-a72f-a1645116b6a8" xlink:to="loc_srt_ProductsAndServicesDomain_c137faa1-1329-4475-b7d9-26c8a8440387" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepositAccountMember_32c1063d-3f57-4e06-aca0-5d005000d465" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepositAccountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_c137faa1-1329-4475-b7d9-26c8a8440387" xlink:to="loc_us-gaap_DepositAccountMember_32c1063d-3f57-4e06-aca0-5d005000d465" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentAdvisoryManagementAndAdministrativeServiceMember_12a09ae6-73e1-465e-9b0a-8cf007325fcf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentAdvisoryManagementAndAdministrativeServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_c137faa1-1329-4475-b7d9-26c8a8440387" xlink:to="loc_us-gaap_InvestmentAdvisoryManagementAndAdministrativeServiceMember_12a09ae6-73e1-465e-9b0a-8cf007325fcf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_InsurancesalescommissionsMember_d42b4f43-a78a-4063-8455-8fbf9c11334e" xlink:href="pnfp-20250930.xsd#pnfp_InsurancesalescommissionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_c137faa1-1329-4475-b7d9-26c8a8440387" xlink:to="loc_pnfp_InsurancesalescommissionsMember_d42b4f43-a78a-4063-8455-8fbf9c11334e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBankingMember_478149c5-fdae-49fc-a534-7073f6bad3fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MortgageBankingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_c137faa1-1329-4475-b7d9-26c8a8440387" xlink:to="loc_us-gaap_MortgageBankingMember_478149c5-fdae-49fc-a534-7073f6bad3fd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_GainonsaleofinvestmentsecuritiesnetMember_9ff99c20-d888-4a82-ae99-5ff9307c62be" xlink:href="pnfp-20250930.xsd#pnfp_GainonsaleofinvestmentsecuritiesnetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_c137faa1-1329-4475-b7d9-26c8a8440387" xlink:to="loc_pnfp_GainonsaleofinvestmentsecuritiesnetMember_9ff99c20-d888-4a82-ae99-5ff9307c62be" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiduciaryAndTrustMember_582fd623-a9c4-4356-9cd7-143c67734963" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiduciaryAndTrustMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_c137faa1-1329-4475-b7d9-26c8a8440387" xlink:to="loc_us-gaap_FiduciaryAndTrustMember_582fd623-a9c4-4356-9cd7-143c67734963" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_IncomefromequitymethodinvestmentMember_5d847b12-d775-4d85-bb68-291a6557a42e" xlink:href="pnfp-20250930.xsd#pnfp_IncomefromequitymethodinvestmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_c137faa1-1329-4475-b7d9-26c8a8440387" xlink:to="loc_pnfp_IncomefromequitymethodinvestmentMember_5d847b12-d775-4d85-bb68-291a6557a42e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_GainLossOnSaleOfFixedAssetsMember_f3cd1f27-f054-4c36-9dcb-1f8edc160085" xlink:href="pnfp-20250930.xsd#pnfp_GainLossOnSaleOfFixedAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_c137faa1-1329-4475-b7d9-26c8a8440387" xlink:to="loc_pnfp_GainLossOnSaleOfFixedAssetsMember_f3cd1f27-f054-4c36-9dcb-1f8edc160085" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialServiceOtherMember_5763fdc6-caa8-4b0e-a28e-4999a03a6ca4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialServiceOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_c137faa1-1329-4475-b7d9-26c8a8440387" xlink:to="loc_us-gaap_FinancialServiceOtherMember_5763fdc6-caa8-4b0e-a28e-4999a03a6ca4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_b8430041-fb85-45be-a917-27a510eaa98b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestAndDividendIncomeOperatingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_b5286d85-6c1b-4906-8fff-1dc863f73533" xlink:to="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_b8430041-fb85-45be-a917-27a510eaa98b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndFeeIncomeLoansAndLeases_468f8f9d-6b45-4607-ac30-cea2b0a1fabf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestAndFeeIncomeLoansAndLeases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_b8430041-fb85-45be-a917-27a510eaa98b" xlink:to="loc_us-gaap_InterestAndFeeIncomeLoansAndLeases_468f8f9d-6b45-4607-ac30-cea2b0a1fabf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeSecuritiesByTaxableStatusAbstract_5eac40e7-94d9-401a-9997-451cf91692c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestAndDividendIncomeSecuritiesByTaxableStatusAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_b8430041-fb85-45be-a917-27a510eaa98b" xlink:to="loc_us-gaap_InterestAndDividendIncomeSecuritiesByTaxableStatusAbstract_5eac40e7-94d9-401a-9997-451cf91692c5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeSecuritiesTaxable_358eb2a1-cab6-4c76-bbbd-18f615532185" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestIncomeSecuritiesTaxable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeSecuritiesByTaxableStatusAbstract_5eac40e7-94d9-401a-9997-451cf91692c5" xlink:to="loc_us-gaap_InterestIncomeSecuritiesTaxable_358eb2a1-cab6-4c76-bbbd-18f615532185" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeSecuritiesTaxExempt_61b4f0f6-cf60-4794-94d3-b5db448b810a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestIncomeSecuritiesTaxExempt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeSecuritiesByTaxableStatusAbstract_5eac40e7-94d9-401a-9997-451cf91692c5" xlink:to="loc_us-gaap_InterestIncomeSecuritiesTaxExempt_61b4f0f6-cf60-4794-94d3-b5db448b810a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeFederalFundsSold_940bb266-5ddc-4b73-a0c6-e72120cd7801" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestIncomeFederalFundsSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeSecuritiesByTaxableStatusAbstract_5eac40e7-94d9-401a-9997-451cf91692c5" xlink:to="loc_us-gaap_InterestIncomeFederalFundsSold_940bb266-5ddc-4b73-a0c6-e72120cd7801" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperating_d4716ac0-d3e3-4949-a03b-80d97e6bd85f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestAndDividendIncomeOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeSecuritiesByTaxableStatusAbstract_5eac40e7-94d9-401a-9997-451cf91692c5" xlink:to="loc_us-gaap_InterestAndDividendIncomeOperating_d4716ac0-d3e3-4949-a03b-80d97e6bd85f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseAbstract_5bd43d3c-0c09-46d3-98b7-eef8947c1334" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_b5286d85-6c1b-4906-8fff-1dc863f73533" xlink:to="loc_us-gaap_InterestExpenseAbstract_5bd43d3c-0c09-46d3-98b7-eef8947c1334" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDeposits_450fc2ea-3739-45ec-b35a-5a641b4b6788" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseDeposits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestExpenseAbstract_5bd43d3c-0c09-46d3-98b7-eef8947c1334" xlink:to="loc_us-gaap_InterestExpenseDeposits_450fc2ea-3739-45ec-b35a-5a641b4b6788" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase_f4cbdbbd-92a7-45bf-ae3d-dbdc4f902382" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestExpenseAbstract_5bd43d3c-0c09-46d3-98b7-eef8947c1334" xlink:to="loc_us-gaap_InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase_f4cbdbbd-92a7-45bf-ae3d-dbdc4f902382" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesShortTerm_e8ed6c56-0799-4a7c-ad28-e495314872c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesShortTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestExpenseAbstract_5bd43d3c-0c09-46d3-98b7-eef8947c1334" xlink:to="loc_us-gaap_InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesShortTerm_e8ed6c56-0799-4a7c-ad28-e495314872c7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOperating_731f154f-8878-42a2-9840-2b677e749690" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestExpenseAbstract_5bd43d3c-0c09-46d3-98b7-eef8947c1334" xlink:to="loc_us-gaap_InterestExpenseOperating_731f154f-8878-42a2-9840-2b677e749690" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_cb3b7952-68ec-4eb2-b06c-48656675f79a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_b5286d85-6c1b-4906-8fff-1dc863f73533" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_cb3b7952-68ec-4eb2-b06c-48656675f79a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForLoanLeaseAndOtherLosses_ff037f51-db41-4243-9a24-33a3209a3011" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProvisionForLoanLeaseAndOtherLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_b5286d85-6c1b-4906-8fff-1dc863f73533" xlink:to="loc_us-gaap_ProvisionForLoanLeaseAndOtherLosses_ff037f51-db41-4243-9a24-33a3209a3011" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_e3152230-da80-4590-a05b-3e75ddba5d51" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_b5286d85-6c1b-4906-8fff-1dc863f73533" xlink:to="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_e3152230-da80-4590-a05b-3e75ddba5d51" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncomeAbstract_92c6bf29-cbef-44c1-85a7-8565a42818f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoninterestIncomeAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_b5286d85-6c1b-4906-8fff-1dc863f73533" xlink:to="loc_us-gaap_NoninterestIncomeAbstract_92c6bf29-cbef-44c1-85a7-8565a42818f7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncome_066604a2-090d-4c02-8c5b-3e02583a6f78" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoninterestIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_92c6bf29-cbef-44c1-85a7-8565a42818f7" xlink:to="loc_us-gaap_NoninterestIncome_066604a2-090d-4c02-8c5b-3e02583a6f78" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpenseAbstract_63f692f4-c9ca-4a07-948e-42a7c3b3b732" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoninterestExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_b5286d85-6c1b-4906-8fff-1dc863f73533" xlink:to="loc_us-gaap_NoninterestExpenseAbstract_63f692f4-c9ca-4a07-948e-42a7c3b3b732" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_9d9c3caf-e791-4333-9db7-85e4c984e247" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_63f692f4-c9ca-4a07-948e-42a7c3b3b732" xlink:to="loc_us-gaap_LaborAndRelatedExpense_9d9c3caf-e791-4333-9db7-85e4c984e247" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OccupancyNet_c84c70b8-2fc1-4264-8c1d-1f233194ca18" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OccupancyNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_63f692f4-c9ca-4a07-948e-42a7c3b3b732" xlink:to="loc_us-gaap_OccupancyNet_c84c70b8-2fc1-4264-8c1d-1f233194ca18" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnSalesOfOtherRealEstate_50b28614-1991-43d5-aa56-c0f96f83d59b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainsLossesOnSalesOfOtherRealEstate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_63f692f4-c9ca-4a07-948e-42a7c3b3b732" xlink:to="loc_us-gaap_GainsLossesOnSalesOfOtherRealEstate_50b28614-1991-43d5-aa56-c0f96f83d59b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessDevelopment_003e3962-c55c-4d60-b21d-5f292cd6301c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessDevelopment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_63f692f4-c9ca-4a07-948e-42a7c3b3b732" xlink:to="loc_us-gaap_BusinessDevelopment_003e3962-c55c-4d60-b21d-5f292cd6301c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SuppliesAndPostageExpense_d4f2a264-dd26-4cda-af5c-4034494262aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SuppliesAndPostageExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_63f692f4-c9ca-4a07-948e-42a7c3b3b732" xlink:to="loc_us-gaap_SuppliesAndPostageExpense_d4f2a264-dd26-4cda-af5c-4034494262aa" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_a693f57e-fe80-4953-a384-9fb099c4b906" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_63f692f4-c9ca-4a07-948e-42a7c3b3b732" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_a693f57e-fe80-4953-a384-9fb099c4b906" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_85539055-c20e-40a6-9356-91eed53c9d86" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_63f692f4-c9ca-4a07-948e-42a7c3b3b732" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_85539055-c20e-40a6-9356-91eed53c9d86" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoninterestExpense_b7a2e7f0-785f-46a8-9aec-263cce457f94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNoninterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_63f692f4-c9ca-4a07-948e-42a7c3b3b732" xlink:to="loc_us-gaap_OtherNoninterestExpense_b7a2e7f0-785f-46a8-9aec-263cce457f94" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpense_65d34c94-4385-4253-bc64-a0b3bc1ad500" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoninterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_63f692f4-c9ca-4a07-948e-42a7c3b3b732" xlink:to="loc_us-gaap_NoninterestExpense_65d34c94-4385-4253-bc64-a0b3bc1ad500" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_ed8a5c1c-0809-4553-89f6-25064b41d01f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_b5286d85-6c1b-4906-8fff-1dc863f73533" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_ed8a5c1c-0809-4553-89f6-25064b41d01f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_9cc7f355-c932-454f-a3f5-3df624e6a109" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_b5286d85-6c1b-4906-8fff-1dc863f73533" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_9cc7f355-c932-454f-a3f5-3df624e6a109" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_18e35c43-0a6e-4cbc-944c-d26ec7fad8b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_b5286d85-6c1b-4906-8fff-1dc863f73533" xlink:to="loc_us-gaap_NetIncomeLoss_18e35c43-0a6e-4cbc-944c-d26ec7fad8b5" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_a47eed59-abca-427e-866d-058ce591a33c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockDividendsIncomeStatementImpact"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_b5286d85-6c1b-4906-8fff-1dc863f73533" xlink:to="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_a47eed59-abca-427e-866d-058ce591a33c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_30ee8543-f1ff-4e13-addf-9280b10dce79" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_b5286d85-6c1b-4906-8fff-1dc863f73533" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_30ee8543-f1ff-4e13-addf-9280b10dce79" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract_87343cd0-3865-49c9-90d4-aed6c7efa00b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_b5286d85-6c1b-4906-8fff-1dc863f73533" xlink:to="loc_us-gaap_EarningsPerShareAbstract_87343cd0-3865-49c9-90d4-aed6c7efa00b" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_781e0bb1-9f43-40fa-9341-201b6d1c59f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_87343cd0-3865-49c9-90d4-aed6c7efa00b" xlink:to="loc_us-gaap_EarningsPerShareBasic_781e0bb1-9f43-40fa-9341-201b6d1c59f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_d7f50b2d-0121-4e55-b359-5f0dff3eb341" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_87343cd0-3865-49c9-90d4-aed6c7efa00b" xlink:to="loc_us-gaap_EarningsPerShareDiluted_d7f50b2d-0121-4e55-b359-5f0dff3eb341" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_7ec0e132-d8ee-459b-8d08-5cfee3aa88d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_b5286d85-6c1b-4906-8fff-1dc863f73533" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_7ec0e132-d8ee-459b-8d08-5cfee3aa88d0" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_8525bb0b-38b9-424e-99bb-35088f6123e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_7ec0e132-d8ee-459b-8d08-5cfee3aa88d0" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_8525bb0b-38b9-424e-99bb-35088f6123e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_1401426e-9000-41ba-acba-6de2078bb3d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_7ec0e132-d8ee-459b-8d08-5cfee3aa88d0" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_1401426e-9000-41ba-acba-6de2078bb3d8" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYUnaudited" xlink:type="simple" xlink:href="pnfp-20250930.xsd#CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYUnaudited"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_4f738aeb-77a2-427a-8137-823812d0dc1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_215aedfc-34b3-4d55-8e70-da295b42f92b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_4f738aeb-77a2-427a-8137-823812d0dc1d" xlink:to="loc_us-gaap_StatementTable_215aedfc-34b3-4d55-8e70-da295b42f92b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_ec6c7a49-f4b1-4622-b001-096a9c51c19b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_215aedfc-34b3-4d55-8e70-da295b42f92b" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_ec6c7a49-f4b1-4622-b001-096a9c51c19b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_ec6c7a49-f4b1-4622-b001-096a9c51c19b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_ec6c7a49-f4b1-4622-b001-096a9c51c19b" xlink:to="loc_us-gaap_EquityComponentDomain_ec6c7a49-f4b1-4622-b001-096a9c51c19b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_2ec31a79-8857-4dea-94a8-d791c3347cbb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_ec6c7a49-f4b1-4622-b001-096a9c51c19b" xlink:to="loc_us-gaap_EquityComponentDomain_2ec31a79-8857-4dea-94a8-d791c3347cbb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_5c07c832-68ee-4b73-b9d3-21683bcf2422" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_2ec31a79-8857-4dea-94a8-d791c3347cbb" xlink:to="loc_us-gaap_PreferredStockMember_5c07c832-68ee-4b73-b9d3-21683bcf2422" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_5a4f0bde-6d55-4811-9c89-4db515e037ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_2ec31a79-8857-4dea-94a8-d791c3347cbb" xlink:to="loc_us-gaap_CommonStockMember_5a4f0bde-6d55-4811-9c89-4db515e037ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_358a2f03-7d5e-4db6-a9d1-fa1faaebf181" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_2ec31a79-8857-4dea-94a8-d791c3347cbb" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_358a2f03-7d5e-4db6-a9d1-fa1faaebf181" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_4e1723de-d3f1-410f-a68e-cf9299cfe4c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_2ec31a79-8857-4dea-94a8-d791c3347cbb" xlink:to="loc_us-gaap_RetainedEarningsMember_4e1723de-d3f1-410f-a68e-cf9299cfe4c8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_05a6f167-acaa-448f-b1d7-6c62b96eb0a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_2ec31a79-8857-4dea-94a8-d791c3347cbb" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_05a6f167-acaa-448f-b1d7-6c62b96eb0a2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareCashPaid_8e4da354-81b7-4921-b788-84a95900f445" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockDividendsPerShareCashPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4f738aeb-77a2-427a-8137-823812d0dc1d" xlink:to="loc_us-gaap_CommonStockDividendsPerShareCashPaid_8e4da354-81b7-4921-b788-84a95900f445" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsPerShareCashPaid_71e0509f-af46-47e9-ae1d-3deb647102de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockDividendsPerShareCashPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4f738aeb-77a2-427a-8137-823812d0dc1d" xlink:to="loc_us-gaap_PreferredStockDividendsPerShareCashPaid_71e0509f-af46-47e9-ae1d-3deb647102de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8a805cc2-5246-4150-9b44-679909cafd66" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4f738aeb-77a2-427a-8137-823812d0dc1d" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8a805cc2-5246-4150-9b44-679909cafd66" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_571a065c-cb8b-4520-98dd-426327f71da1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8a805cc2-5246-4150-9b44-679909cafd66" xlink:to="loc_us-gaap_StockholdersEquity_571a065c-cb8b-4520-98dd-426327f71da1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_daf87af5-2947-44aa-bb88-4a4243b7ece5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8a805cc2-5246-4150-9b44-679909cafd66" xlink:to="loc_us-gaap_SharesOutstanding_daf87af5-2947-44aa-bb88-4a4243b7ece5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense_49dca74e-0d79-42e4-8345-3cd57de189e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8a805cc2-5246-4150-9b44-679909cafd66" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense_49dca74e-0d79-42e4-8345-3cd57de189e5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_61ee74cb-4683-4a6c-b90d-06c795080c79" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8a805cc2-5246-4150-9b44-679909cafd66" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_61ee74cb-4683-4a6c-b90d-06c795080c79" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPreferredStockCash_f36cdc63-27a7-403d-945a-69e3585f8e73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsPreferredStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8a805cc2-5246-4150-9b44-679909cafd66" xlink:to="loc_us-gaap_DividendsPreferredStockCash_f36cdc63-27a7-403d-945a-69e3585f8e73" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_79ee0c31-548b-43aa-92cf-677a7afb71d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsCommonStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8a805cc2-5246-4150-9b44-679909cafd66" xlink:to="loc_us-gaap_DividendsCommonStockCash_79ee0c31-548b-43aa-92cf-677a7afb71d9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_e47e5e29-691e-439d-9961-ea513d979817" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8a805cc2-5246-4150-9b44-679909cafd66" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_e47e5e29-691e-439d-9961-ea513d979817" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_a098a0f0-e026-40fd-875e-00143d38ae4a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8a805cc2-5246-4150-9b44-679909cafd66" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_a098a0f0-e026-40fd-875e-00143d38ae4a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_90767784-87e2-4b28-95e1-461bf7ab2536" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8a805cc2-5246-4150-9b44-679909cafd66" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_90767784-87e2-4b28-95e1-461bf7ab2536" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_40025880-09fd-47fc-b861-b648fd2a2e3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8a805cc2-5246-4150-9b44-679909cafd66" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_40025880-09fd-47fc-b861-b648fd2a2e3a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueOther_d2081290-f220-43ac-a4a0-cccdafc3f362" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8a805cc2-5246-4150-9b44-679909cafd66" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueOther_d2081290-f220-43ac-a4a0-cccdafc3f362" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesOther_a2ba8675-9c3d-4e8d-9a75-c457b4248b23" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8a805cc2-5246-4150-9b44-679909cafd66" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesOther_a2ba8675-9c3d-4e8d-9a75-c457b4248b23" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_1125e652-d4f9-4ffb-b37b-897b2d16c3cb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8a805cc2-5246-4150-9b44-679909cafd66" xlink:to="loc_us-gaap_ShareBasedCompensation_1125e652-d4f9-4ffb-b37b-897b2d16c3cb" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_93e12383-8d54-45c2-bb35-031598c47092" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8a805cc2-5246-4150-9b44-679909cafd66" xlink:to="loc_us-gaap_NetIncomeLoss_93e12383-8d54-45c2-bb35-031598c47092" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_3b6a11d2-cd11-4859-8d81-070941a201d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8a805cc2-5246-4150-9b44-679909cafd66" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_3b6a11d2-cd11-4859-8d81-070941a201d4" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_b618ed2f-592a-4409-9748-cf67ad7d6275" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_72c6d44b-3439-4e62-be81-3587a4839491" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesOutstanding"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWSUnaudited" xlink:type="simple" xlink:href="pnfp-20250930.xsd#CONSOLIDATEDSTATEMENTSOFCASHFLOWSUnaudited"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWSUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_27601f76-362d-40c9-98d2-cc92717fc1eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_d7839fe4-b338-41c9-add7-6485d97c3b6a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_27601f76-362d-40c9-98d2-cc92717fc1eb" xlink:to="loc_us-gaap_StatementTable_d7839fe4-b338-41c9-add7-6485d97c3b6a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_01dbc705-2d2c-4e64-9b12-c8f5a54618de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_d7839fe4-b338-41c9-add7-6485d97c3b6a" xlink:to="loc_us-gaap_FinancialInstrumentAxis_01dbc705-2d2c-4e64-9b12-c8f5a54618de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01dbc705-2d2c-4e64-9b12-c8f5a54618de_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01dbc705-2d2c-4e64-9b12-c8f5a54618de" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01dbc705-2d2c-4e64-9b12-c8f5a54618de_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_5f69f0a8-a6a4-42bc-893e-c70149a21e62" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01dbc705-2d2c-4e64-9b12-c8f5a54618de" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_5f69f0a8-a6a4-42bc-893e-c70149a21e62" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialLoanMember_45ac5ad2-6a8f-494a-a5dd-01138ef02e31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_5f69f0a8-a6a4-42bc-893e-c70149a21e62" xlink:to="loc_us-gaap_CommercialLoanMember_45ac5ad2-6a8f-494a-a5dd-01138ef02e31" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerLoanMember_6b39f469-e090-408a-8e6a-9540e201e6cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConsumerLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_5f69f0a8-a6a4-42bc-893e-c70149a21e62" xlink:to="loc_us-gaap_ConsumerLoanMember_6b39f469-e090-408a-8e6a-9540e201e6cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_d08d673b-9225-4994-a99b-db68426c5579" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_27601f76-362d-40c9-98d2-cc92717fc1eb" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_d08d673b-9225-4994-a99b-db68426c5579" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_4150dcbb-d99c-40a0-b62b-8fe24f176528" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_d08d673b-9225-4994-a99b-db68426c5579" xlink:to="loc_us-gaap_NetIncomeLoss_4150dcbb-d99c-40a0-b62b-8fe24f176528" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_91693782-ffe7-4977-b9c9-977fb5934932" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_d08d673b-9225-4994-a99b-db68426c5579" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_91693782-ffe7-4977-b9c9-977fb5934932" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_65ad30c8-0e15-4658-9c38-4a7dbf1d2fe1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_91693782-ffe7-4977-b9c9-977fb5934932" xlink:to="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_65ad30c8-0e15-4658-9c38-4a7dbf1d2fe1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAmortizationAndAccretionNet_ca3d4bcb-6f66-4777-8cb6-a6a14b60eec4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationAmortizationAndAccretionNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_91693782-ffe7-4977-b9c9-977fb5934932" xlink:to="loc_us-gaap_DepreciationAmortizationAndAccretionNet_ca3d4bcb-6f66-4777-8cb6-a6a14b60eec4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForLoanLeaseAndOtherLosses_8bb620e1-9197-4239-b9b7-5f78f34aabf0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProvisionForLoanLeaseAndOtherLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_91693782-ffe7-4977-b9c9-977fb5934932" xlink:to="loc_us-gaap_ProvisionForLoanLeaseAndOtherLosses_8bb620e1-9197-4239-b9b7-5f78f34aabf0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfMortgageLoans_4af249af-558d-4e75-84ee-6b7e9b1943d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnSaleOfMortgageLoans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_91693782-ffe7-4977-b9c9-977fb5934932" xlink:to="loc_us-gaap_GainLossOnSaleOfMortgageLoans_4af249af-558d-4e75-84ee-6b7e9b1943d3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfInvestments_26fc785c-1046-4c6a-bf56-f2ef35c40cf9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnSaleOfInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_91693782-ffe7-4977-b9c9-977fb5934932" xlink:to="loc_us-gaap_GainLossOnSaleOfInvestments_26fc785c-1046-4c6a-bf56-f2ef35c40cf9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInEquitySecuritiesFvNi_3d34e429-0e7e-4360-8797-fd306656bf8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInEquitySecuritiesFvNi"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_91693782-ffe7-4977-b9c9-977fb5934932" xlink:to="loc_us-gaap_IncreaseDecreaseInEquitySecuritiesFvNi_3d34e429-0e7e-4360-8797-fd306656bf8a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_471e1ab6-b187-401b-9e2b-368d496a9803" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_91693782-ffe7-4977-b9c9-977fb5934932" xlink:to="loc_us-gaap_ShareBasedCompensation_471e1ab6-b187-401b-9e2b-368d496a9803" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_ee3de2d1-3e88-4442-921e-5b44124bfc5d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_91693782-ffe7-4977-b9c9-977fb5934932" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_ee3de2d1-3e88-4442-921e-5b44124bfc5d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_GainsLossesOnSalesOfOtherRealEstateAndOtherInvestments_ab702926-150d-46e8-97df-7a36180efb30" xlink:href="pnfp-20250930.xsd#pnfp_GainsLossesOnSalesOfOtherRealEstateAndOtherInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_91693782-ffe7-4977-b9c9-977fb5934932" xlink:to="loc_pnfp_GainsLossesOnSalesOfOtherRealEstateAndOtherInvestments_ab702926-150d-46e8-97df-7a36180efb30" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_e79f11fd-4718-4656-b058-14b6f58a7f2c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_91693782-ffe7-4977-b9c9-977fb5934932" xlink:to="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_e79f11fd-4718-4656-b058-14b6f58a7f2c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain_68e363c2-ab23-4a5c-a7ca-6965bdf1f534" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_91693782-ffe7-4977-b9c9-977fb5934932" xlink:to="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain_68e363c2-ab23-4a5c-a7ca-6965bdf1f534" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_27dac170-0445-4960-a815-46000a61c79c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_91693782-ffe7-4977-b9c9-977fb5934932" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_27dac170-0445-4960-a815-46000a61c79c" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentDividendsOrDistributions_e817a5aa-3d58-4365-a4d0-5d68362eb766" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentDividendsOrDistributions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_91693782-ffe7-4977-b9c9-977fb5934932" xlink:to="loc_us-gaap_EquityMethodInvestmentDividendsOrDistributions_e817a5aa-3d58-4365-a4d0-5d68362eb766" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_ExcessTaxBenefitFromStockCompensation_addc11c6-b080-4d2f-8539-47396436503c" xlink:href="pnfp-20250930.xsd#pnfp_ExcessTaxBenefitFromStockCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_91693782-ffe7-4977-b9c9-977fb5934932" xlink:to="loc_pnfp_ExcessTaxBenefitFromStockCompensation_addc11c6-b080-4d2f-8539-47396436503c" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfLoansAndLeases_3b34a937-4595-4168-825d-8c473fffc3c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnSaleOfLoansAndLeases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_91693782-ffe7-4977-b9c9-977fb5934932" xlink:to="loc_us-gaap_GainLossOnSaleOfLoansAndLeases_3b34a937-4595-4168-825d-8c473fffc3c1" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForOriginationAndPurchasesOfLoansHeldForSale_6745555a-0e8f-4483-8f6b-77fcfa8d2174" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForOriginationAndPurchasesOfLoansHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_91693782-ffe7-4977-b9c9-977fb5934932" xlink:to="loc_us-gaap_PaymentsForOriginationAndPurchasesOfLoansHeldForSale_6745555a-0e8f-4483-8f6b-77fcfa8d2174" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfLoansHeldForSale_45d0e9da-28de-4802-a53a-b55d82b59862" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromSaleOfLoansHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_91693782-ffe7-4977-b9c9-977fb5934932" xlink:to="loc_us-gaap_ProceedsFromSaleOfLoansHeldForSale_45d0e9da-28de-4802-a53a-b55d82b59862" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_4dce346d-ee44-4904-91af-0ca44107e0e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_91693782-ffe7-4977-b9c9-977fb5934932" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_4dce346d-ee44-4904-91af-0ca44107e0e6" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_bebcb200-e92e-414a-b539-4459a2d53819" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_91693782-ffe7-4977-b9c9-977fb5934932" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_bebcb200-e92e-414a-b539-4459a2d53819" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d43cbafb-c502-4c19-b95f-ecb62ebf8ab4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_d08d673b-9225-4994-a99b-db68426c5579" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d43cbafb-c502-4c19-b95f-ecb62ebf8ab4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_b2987c53-3689-47c4-a07a-182bd660728d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_27601f76-362d-40c9-98d2-cc92717fc1eb" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_b2987c53-3689-47c4-a07a-182bd660728d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_ActivitiesInSecuritiesAvailableForSaleAbstract_2adffe22-8b51-4a25-a18c-5f210410eb9d" xlink:href="pnfp-20250930.xsd#pnfp_ActivitiesInSecuritiesAvailableForSaleAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_b2987c53-3689-47c4-a07a-182bd660728d" xlink:to="loc_pnfp_ActivitiesInSecuritiesAvailableForSaleAbstract_2adffe22-8b51-4a25-a18c-5f210410eb9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_63c8159b-01fc-4f13-b349-408ea3579052" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_ActivitiesInSecuritiesAvailableForSaleAbstract_2adffe22-8b51-4a25-a18c-5f210410eb9d" xlink:to="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_63c8159b-01fc-4f13-b349-408ea3579052" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt_09ebca77-c7ca-4c85-8541-686b8b70164d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_ActivitiesInSecuritiesAvailableForSaleAbstract_2adffe22-8b51-4a25-a18c-5f210410eb9d" xlink:to="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt_09ebca77-c7ca-4c85-8541-686b8b70164d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_8257594c-c431-4f46-a0f9-62d710540664" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_ActivitiesInSecuritiesAvailableForSaleAbstract_2adffe22-8b51-4a25-a18c-5f210410eb9d" xlink:to="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_8257594c-c431-4f46-a0f9-62d710540664" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_ActivitiesInSecuritiesHeldToMaturityAbstract_591ff026-c2c1-4480-a9d8-9f733f34141e" xlink:href="pnfp-20250930.xsd#pnfp_ActivitiesInSecuritiesHeldToMaturityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_b2987c53-3689-47c4-a07a-182bd660728d" xlink:to="loc_pnfp_ActivitiesInSecuritiesHeldToMaturityAbstract_591ff026-c2c1-4480-a9d8-9f733f34141e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireHeldToMaturitySecurities_d9d3f39d-c289-4094-9610-8e2e875cf365" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireHeldToMaturitySecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_ActivitiesInSecuritiesHeldToMaturityAbstract_591ff026-c2c1-4480-a9d8-9f733f34141e" xlink:to="loc_us-gaap_PaymentsToAcquireHeldToMaturitySecurities_d9d3f39d-c289-4094-9610-8e2e875cf365" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities_ebebc951-d447-4cea-b707-51b485d8cccc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_ActivitiesInSecuritiesHeldToMaturityAbstract_591ff026-c2c1-4480-a9d8-9f733f34141e" xlink:to="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities_ebebc951-d447-4cea-b707-51b485d8cccc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsForSecuritiesPurchasedUnderAgreementsToResell_628140f2-71ed-4033-bf46-135cdf889bb4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromPaymentsForSecuritiesPurchasedUnderAgreementsToResell"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_ActivitiesInSecuritiesHeldToMaturityAbstract_591ff026-c2c1-4480-a9d8-9f733f34141e" xlink:to="loc_us-gaap_ProceedsFromPaymentsForSecuritiesPurchasedUnderAgreementsToResell_628140f2-71ed-4033-bf46-135cdf889bb4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherLoansAndLeases_c982d67f-832a-4c71-8252-121068d02136" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForProceedsFromOtherLoansAndLeases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_ActivitiesInSecuritiesHeldToMaturityAbstract_591ff026-c2c1-4480-a9d8-9f733f34141e" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherLoansAndLeases_c982d67f-832a-4c71-8252-121068d02136" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfLoansAndLeasesHeldForInvestment_48de9eea-4b76-41c4-a9ad-9e8cd6a52606" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromSaleOfLoansAndLeasesHeldForInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_b2987c53-3689-47c4-a07a-182bd660728d" xlink:to="loc_us-gaap_ProceedsFromSaleOfLoansAndLeasesHeldForInvestment_48de9eea-4b76-41c4-a9ad-9e8cd6a52606" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_6058dd3b-542b-4d86-9f47-50e1a760d49b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_b2987c53-3689-47c4-a07a-182bd660728d" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_6058dd3b-542b-4d86-9f47-50e1a760d49b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_eb86a95d-154e-4cc7-9754-78443b5aec3c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_b2987c53-3689-47c4-a07a-182bd660728d" xlink:to="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_eb86a95d-154e-4cc7-9754-78443b5aec3c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfOtherRealEstate_c48ae773-b105-4b63-b226-3473d62dbb2c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromSaleOfOtherRealEstate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_b2987c53-3689-47c4-a07a-182bd660728d" xlink:to="loc_us-gaap_ProceedsFromSaleOfOtherRealEstate_c48ae773-b105-4b63-b226-3473d62dbb2c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireLifeInsurancePolicies_0bc76533-0f8a-4dc0-beae-ccacdbe3a280" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireLifeInsurancePolicies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_b2987c53-3689-47c4-a07a-182bd660728d" xlink:to="loc_us-gaap_PaymentsToAcquireLifeInsurancePolicies_0bc76533-0f8a-4dc0-beae-ccacdbe3a280" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromInsuranceSettlementInvestingActivities_108c6121-18ee-4543-808a-0b43107e7d1b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromInsuranceSettlementInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_b2987c53-3689-47c4-a07a-182bd660728d" xlink:to="loc_us-gaap_ProceedsFromInsuranceSettlementInvestingActivities_108c6121-18ee-4543-808a-0b43107e7d1b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLifeInsurancePolicies_e2c47d13-e488-4877-969e-bc89c67e6ec6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromLifeInsurancePolicies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_b2987c53-3689-47c4-a07a-182bd660728d" xlink:to="loc_us-gaap_ProceedsFromLifeInsurancePolicies_e2c47d13-e488-4877-969e-bc89c67e6ec6" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities_d707ee13-0744-4a62-83e0-534b65eefa86" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_b2987c53-3689-47c4-a07a-182bd660728d" xlink:to="loc_us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities_d707ee13-0744-4a62-83e0-534b65eefa86" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfFederalHomeLoanBankStock_6b4b3329-0e10-4a9c-938c-467f820c6d63" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromSaleOfFederalHomeLoanBankStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_b2987c53-3689-47c4-a07a-182bd660728d" xlink:to="loc_us-gaap_ProceedsFromSaleOfFederalHomeLoanBankStock_6b4b3329-0e10-4a9c-938c-467f820c6d63" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_8fb4a117-f876-424c-bc9c-7c7c184d82ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_b2987c53-3689-47c4-a07a-182bd660728d" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_8fb4a117-f876-424c-bc9c-7c7c184d82ea" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireIntangibleAssets_c7d2cc68-7987-4310-9f2c-ba3814f34e8f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_b2987c53-3689-47c4-a07a-182bd660728d" xlink:to="loc_us-gaap_PaymentsToAcquireIntangibleAssets_c7d2cc68-7987-4310-9f2c-ba3814f34e8f" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_3914c62f-426c-40f0-9587-d80504d401cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_b2987c53-3689-47c4-a07a-182bd660728d" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_3914c62f-426c-40f0-9587-d80504d401cc" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_042390aa-259d-4fe0-a545-b0c18a180a89" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_b2987c53-3689-47c4-a07a-182bd660728d" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_042390aa-259d-4fe0-a545-b0c18a180a89" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_f8ff2f19-b792-43dc-a60b-8ffc9eb2a91a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_27601f76-362d-40c9-98d2-cc92717fc1eb" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_f8ff2f19-b792-43dc-a60b-8ffc9eb2a91a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInDeposits_b14045c8-9135-4342-a18d-d7c835fa4a2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInDeposits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_f8ff2f19-b792-43dc-a60b-8ffc9eb2a91a" xlink:to="loc_us-gaap_IncreaseDecreaseInDeposits_b14045c8-9135-4342-a18d-d7c835fa4a2a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase_a78e10fa-7bc8-4a44-9604-281283631e80" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_f8ff2f19-b792-43dc-a60b-8ffc9eb2a91a" xlink:to="loc_us-gaap_ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase_a78e10fa-7bc8-4a44-9604-281283631e80" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromFederalHomeLoanBankBorrowings_36358b20-d7bf-4686-934c-157bdd94fb13" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromFederalHomeLoanBankBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_f8ff2f19-b792-43dc-a60b-8ffc9eb2a91a" xlink:to="loc_us-gaap_ProceedsFromFederalHomeLoanBankBorrowings_36358b20-d7bf-4686-934c-157bdd94fb13" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfFederalHomeLoanBankBorrowings_085e8d41-7d9e-4fc8-9f07-1285fa012afe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfFederalHomeLoanBankBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_f8ff2f19-b792-43dc-a60b-8ffc9eb2a91a" xlink:to="loc_us-gaap_RepaymentsOfFederalHomeLoanBankBorrowings_085e8d41-7d9e-4fc8-9f07-1285fa012afe" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfNotesPayable_c49afd2b-8bbb-4415-bda8-75eedffbd081" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfNotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_f8ff2f19-b792-43dc-a60b-8ffc9eb2a91a" xlink:to="loc_us-gaap_RepaymentsOfNotesPayable_c49afd2b-8bbb-4415-bda8-75eedffbd081" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations_e566c0ff-551a-4be0-b5a8-6ecb7f7b9724" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_f8ff2f19-b792-43dc-a60b-8ffc9eb2a91a" xlink:to="loc_us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations_e566c0ff-551a-4be0-b5a8-6ecb7f7b9724" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_83522ea8-c6f7-495d-8f06-92ac5f05a25e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_f8ff2f19-b792-43dc-a60b-8ffc9eb2a91a" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_83522ea8-c6f7-495d-8f06-92ac5f05a25e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_ProceedsFromStockOptionsExercisedNetOfRepurchaseOfRestrictedShares_34aada7d-300b-4320-9956-29b1e05924a8" xlink:href="pnfp-20250930.xsd#pnfp_ProceedsFromStockOptionsExercisedNetOfRepurchaseOfRestrictedShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_f8ff2f19-b792-43dc-a60b-8ffc9eb2a91a" xlink:to="loc_pnfp_ProceedsFromStockOptionsExercisedNetOfRepurchaseOfRestrictedShares_34aada7d-300b-4320-9956-29b1e05924a8" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_7dcfddfb-29ad-405e-a43d-7115fcd939ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsOfDividendsCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_f8ff2f19-b792-43dc-a60b-8ffc9eb2a91a" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_7dcfddfb-29ad-405e-a43d-7115fcd939ba" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_14031b8b-510a-4dc8-9e77-b0c079b90a2c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_f8ff2f19-b792-43dc-a60b-8ffc9eb2a91a" xlink:to="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_14031b8b-510a-4dc8-9e77-b0c079b90a2c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_51f97dce-db7a-47e1-aaa6-3e1035a2f366" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_f8ff2f19-b792-43dc-a60b-8ffc9eb2a91a" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_51f97dce-db7a-47e1-aaa6-3e1035a2f366" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_805d087a-1be4-457b-9954-cda7c0da1150" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_27601f76-362d-40c9-98d2-cc92717fc1eb" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_805d087a-1be4-457b-9954-cda7c0da1150" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_2dff8c05-f363-4965-9b8e-e8ba9d64d914" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_27601f76-362d-40c9-98d2-cc92717fc1eb" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_2dff8c05-f363-4965-9b8e-e8ba9d64d914" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_92f2c0fd-cca8-428b-8baf-68922d7aecf2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareCashPaid_e942fbe3-80a6-4305-8513-2c0087ab06b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockDividendsPerShareCashPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_27601f76-362d-40c9-98d2-cc92717fc1eb" xlink:to="loc_us-gaap_CommonStockDividendsPerShareCashPaid_e942fbe3-80a6-4305-8513-2c0087ab06b8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsPerShareCashPaid_5c26f156-203d-4603-8efe-683f956eb185" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockDividendsPerShareCashPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_27601f76-362d-40c9-98d2-cc92717fc1eb" xlink:to="loc_us-gaap_PreferredStockDividendsPerShareCashPaid_5c26f156-203d-4603-8efe-683f956eb185" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/SummaryofSignificantAccountingPoliciesNarrativeDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#SummaryofSignificantAccountingPoliciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/SummaryofSignificantAccountingPoliciesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_07f7f4f2-6ae2-41cd-8bcc-6bbc21518765" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_456ac59b-4b5c-44ed-92ca-5a2c3e36513b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_07f7f4f2-6ae2-41cd-8bcc-6bbc21518765" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_456ac59b-4b5c-44ed-92ca-5a2c3e36513b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1c58c6d7-3453-4d2a-99b3-c09992089377" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_456ac59b-4b5c-44ed-92ca-5a2c3e36513b" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1c58c6d7-3453-4d2a-99b3-c09992089377" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_1c58c6d7-3453-4d2a-99b3-c09992089377_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1c58c6d7-3453-4d2a-99b3-c09992089377" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_1c58c6d7-3453-4d2a-99b3-c09992089377_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_e689f234-98b3-4bad-bef1-93c6526e6ea1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1c58c6d7-3453-4d2a-99b3-c09992089377" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_e689f234-98b3-4bad-bef1-93c6526e6ea1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_BankersHealthcareGroupLLCMember_dff165b1-ab59-4f6e-9126-7cf9d5494367" xlink:href="pnfp-20250930.xsd#pnfp_BankersHealthcareGroupLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_e689f234-98b3-4bad-bef1-93c6526e6ea1" xlink:to="loc_pnfp_BankersHealthcareGroupLLCMember_dff165b1-ab59-4f6e-9126-7cf9d5494367" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_4ea59dfa-bf02-4bd4-a526-cf8d0de356a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_456ac59b-4b5c-44ed-92ca-5a2c3e36513b" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_4ea59dfa-bf02-4bd4-a526-cf8d0de356a6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4ea59dfa-bf02-4bd4-a526-cf8d0de356a6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_4ea59dfa-bf02-4bd4-a526-cf8d0de356a6" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4ea59dfa-bf02-4bd4-a526-cf8d0de356a6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_096ac828-b4f9-4748-85ee-aa8b00efe06a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_4ea59dfa-bf02-4bd4-a526-cf8d0de356a6" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_096ac828-b4f9-4748-85ee-aa8b00efe06a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_c2ba37d2-8d31-49da-a27e-efe0de08bf5a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_07f7f4f2-6ae2-41cd-8bcc-6bbc21518765" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_c2ba37d2-8d31-49da-a27e-efe0de08bf5a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/EquitymethodinvestmentFinancialPositionandResultsofOperationsDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#EquitymethodinvestmentFinancialPositionandResultsofOperationsDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/EquitymethodinvestmentFinancialPositionandResultsofOperationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_cafa3e93-2dff-4fcd-ac2d-21c4522299ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_8a004bc3-de11-4d21-9476-77f6bb69e538" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_cafa3e93-2dff-4fcd-ac2d-21c4522299ef" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_8a004bc3-de11-4d21-9476-77f6bb69e538" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_5aa83512-d805-4686-bdcc-21e5b1b5cdbf" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_8a004bc3-de11-4d21-9476-77f6bb69e538" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_5aa83512-d805-4686-bdcc-21e5b1b5cdbf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_5aa83512-d805-4686-bdcc-21e5b1b5cdbf_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_5aa83512-d805-4686-bdcc-21e5b1b5cdbf" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_5aa83512-d805-4686-bdcc-21e5b1b5cdbf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_774c76b6-999e-44b4-98e4-1173ffde7099" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_5aa83512-d805-4686-bdcc-21e5b1b5cdbf" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_774c76b6-999e-44b4-98e4-1173ffde7099" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_BankersHealthcareGroupLLCMember_dbe8b922-2079-49db-af82-489b8c48b9de" xlink:href="pnfp-20250930.xsd#pnfp_BankersHealthcareGroupLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_774c76b6-999e-44b4-98e4-1173ffde7099" xlink:to="loc_pnfp_BankersHealthcareGroupLLCMember_dbe8b922-2079-49db-af82-489b8c48b9de" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_631cd125-b801-4ad4-b1f8-86e9bcef09a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_8a004bc3-de11-4d21-9476-77f6bb69e538" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_631cd125-b801-4ad4-b1f8-86e9bcef09a1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_631cd125-b801-4ad4-b1f8-86e9bcef09a1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_631cd125-b801-4ad4-b1f8-86e9bcef09a1" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_631cd125-b801-4ad4-b1f8-86e9bcef09a1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_e3427747-66a0-4136-9789-21e57933daaa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_631cd125-b801-4ad4-b1f8-86e9bcef09a1" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_e3427747-66a0-4136-9789-21e57933daaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_BankersHealthcareGroupLLCMember_3a38abea-523d-4ad6-a102-1c42f453d9c1" xlink:href="pnfp-20250930.xsd#pnfp_BankersHealthcareGroupLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_e3427747-66a0-4136-9789-21e57933daaa" xlink:to="loc_pnfp_BankersHealthcareGroupLLCMember_3a38abea-523d-4ad6-a102-1c42f453d9c1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_b6531eaf-8967-45ed-b0f3-767a2fb7abdd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_cafa3e93-2dff-4fcd-ac2d-21c4522299ef" xlink:to="loc_us-gaap_Assets_b6531eaf-8967-45ed-b0f3-767a2fb7abdd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_a05b9ed7-c07b-499f-8541-b313c85cb5c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_cafa3e93-2dff-4fcd-ac2d-21c4522299ef" xlink:to="loc_us-gaap_Liabilities_a05b9ed7-c07b-499f-8541-b313c85cb5c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_1eabb097-2729-4cb0-8958-de476b4a2147" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_cafa3e93-2dff-4fcd-ac2d-21c4522299ef" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_1eabb097-2729-4cb0-8958-de476b4a2147" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_8e196702-e511-4225-b54a-2c9664c2583f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_cafa3e93-2dff-4fcd-ac2d-21c4522299ef" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_8e196702-e511-4225-b54a-2c9664c2583f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_a57ba3e7-d489-4fc9-8090-164810905d97" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_cafa3e93-2dff-4fcd-ac2d-21c4522299ef" xlink:to="loc_us-gaap_Revenues_a57ba3e7-d489-4fc9-8090-164810905d97" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_941a696c-0f1a-4eb0-aebb-d4e10ccdab83" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_cafa3e93-2dff-4fcd-ac2d-21c4522299ef" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_941a696c-0f1a-4eb0-aebb-d4e10ccdab83" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/EquitymethodinvestmentNarrativeDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#EquitymethodinvestmentNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/EquitymethodinvestmentNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_196144b4-99c9-4316-b62b-2d48ba1bdf06" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_548bd7ec-7a13-431f-88d7-cd33d791f0a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_196144b4-99c9-4316-b62b-2d48ba1bdf06" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_548bd7ec-7a13-431f-88d7-cd33d791f0a2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_20438722-d28c-4a2f-a8c3-9f2016b65b2a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_548bd7ec-7a13-431f-88d7-cd33d791f0a2" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_20438722-d28c-4a2f-a8c3-9f2016b65b2a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_20438722-d28c-4a2f-a8c3-9f2016b65b2a_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_20438722-d28c-4a2f-a8c3-9f2016b65b2a" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_20438722-d28c-4a2f-a8c3-9f2016b65b2a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_8d343a82-600c-4adf-86a2-9110850ed796" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_20438722-d28c-4a2f-a8c3-9f2016b65b2a" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_8d343a82-600c-4adf-86a2-9110850ed796" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_BankersHealthcareGroupLLCMember_bf50f00c-d451-4d46-868d-87b53fe77dcb" xlink:href="pnfp-20250930.xsd#pnfp_BankersHealthcareGroupLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_8d343a82-600c-4adf-86a2-9110850ed796" xlink:to="loc_pnfp_BankersHealthcareGroupLLCMember_bf50f00c-d451-4d46-868d-87b53fe77dcb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_0a7d2177-527a-41df-9ae8-3d05ca7422b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_196144b4-99c9-4316-b62b-2d48ba1bdf06" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_0a7d2177-527a-41df-9ae8-3d05ca7422b1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_3902df21-00e0-4766-9fc2-756138105ba6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_196144b4-99c9-4316-b62b-2d48ba1bdf06" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_3902df21-00e0-4766-9fc2-756138105ba6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_AccretionIncome_f88ac9d8-2104-4975-b05e-b61898f9b343" xlink:href="pnfp-20250930.xsd#pnfp_AccretionIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_196144b4-99c9-4316-b62b-2d48ba1bdf06" xlink:to="loc_pnfp_AccretionIncome_f88ac9d8-2104-4975-b05e-b61898f9b343" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentDividendsOrDistributions_3e16a03b-b62a-4ddd-b17c-56dc72149783" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentDividendsOrDistributions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_196144b4-99c9-4316-b62b-2d48ba1bdf06" xlink:to="loc_us-gaap_EquityMethodInvestmentDividendsOrDistributions_3e16a03b-b62a-4ddd-b17c-56dc72149783" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireLoansHeldForInvestment_1071e6a4-5c61-4961-bc6c-bf4f71bb2697" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireLoansHeldForInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_196144b4-99c9-4316-b62b-2d48ba1bdf06" xlink:to="loc_us-gaap_PaymentsToAcquireLoansHeldForInvestment_1071e6a4-5c61-4961-bc6c-bf4f71bb2697" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome_85850112-38d3-4ce3-82d1-ee98d2c684a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_196144b4-99c9-4316-b62b-2d48ba1bdf06" xlink:to="loc_us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome_85850112-38d3-4ce3-82d1-ee98d2c684a9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfLoansAndLeasesHeldForInvestment_bb8381b9-0f1a-4e78-86a1-ec8c6bbf2cd6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromSaleOfLoansAndLeasesHeldForInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_196144b4-99c9-4316-b62b-2d48ba1bdf06" xlink:to="loc_us-gaap_ProceedsFromSaleOfLoansAndLeasesHeldForInvestment_bb8381b9-0f1a-4e78-86a1-ec8c6bbf2cd6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableGross_5e8b7d34-4ee4-46ef-89e0-9cbc9b48aa2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesReceivableGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_196144b4-99c9-4316-b62b-2d48ba1bdf06" xlink:to="loc_us-gaap_NotesReceivableGross_5e8b7d34-4ee4-46ef-89e0-9cbc9b48aa2a" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/SecuritiesSecuritiesNarrativeDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#SecuritiesSecuritiesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/SecuritiesSecuritiesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_a654f952-0405-4cb8-89b2-74a4507912f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_67ffefa1-9eb5-43ac-b415-eb60ad59bce2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_a654f952-0405-4cb8-89b2-74a4507912f5" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_67ffefa1-9eb5-43ac-b415-eb60ad59bce2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_4ae5ff56-055d-4471-8cb1-53423335ac33" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_67ffefa1-9eb5-43ac-b415-eb60ad59bce2" xlink:to="loc_us-gaap_FinancialInstrumentAxis_4ae5ff56-055d-4471-8cb1-53423335ac33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_4ae5ff56-055d-4471-8cb1-53423335ac33_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_4ae5ff56-055d-4471-8cb1-53423335ac33" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_4ae5ff56-055d-4471-8cb1-53423335ac33_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f0844bc7-132e-444c-b4f6-187ea2e42790" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_4ae5ff56-055d-4471-8cb1-53423335ac33" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f0844bc7-132e-444c-b4f6-187ea2e42790" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetPledgedAsCollateralMember_cece92ef-c101-405b-a99f-382de22fde29" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetPledgedAsCollateralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f0844bc7-132e-444c-b4f6-187ea2e42790" xlink:to="loc_us-gaap_AssetPledgedAsCollateralMember_cece92ef-c101-405b-a99f-382de22fde29" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusAxis_f3dbb249-b237-4d65-812d-8e9884ab9023" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_67ffefa1-9eb5-43ac-b415-eb60ad59bce2" xlink:to="loc_us-gaap_PledgedStatusAxis_f3dbb249-b237-4d65-812d-8e9884ab9023" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusDomain_f3dbb249-b237-4d65-812d-8e9884ab9023_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PledgedStatusAxis_f3dbb249-b237-4d65-812d-8e9884ab9023" xlink:to="loc_us-gaap_PledgedStatusDomain_f3dbb249-b237-4d65-812d-8e9884ab9023_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusDomain_f39c4f75-74d1-4466-8f2e-42dbd10e780a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PledgedStatusAxis_f3dbb249-b237-4d65-812d-8e9884ab9023" xlink:to="loc_us-gaap_PledgedStatusDomain_f39c4f75-74d1-4466-8f2e-42dbd10e780a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetPledgedAsCollateralMember_34c95db5-38e2-4f53-8ed9-d239e6a47436" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetPledgedAsCollateralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PledgedStatusDomain_f39c4f75-74d1-4466-8f2e-42dbd10e780a" xlink:to="loc_us-gaap_AssetPledgedAsCollateralMember_34c95db5-38e2-4f53-8ed9-d239e6a47436" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_AvailableforsalesecuritiestransferredtoHeldtoMaturity_ee95c54e-693d-4a64-a749-b043b5478a6c" xlink:href="pnfp-20250930.xsd#pnfp_AvailableforsalesecuritiestransferredtoHeldtoMaturity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_a654f952-0405-4cb8-89b2-74a4507912f5" xlink:to="loc_pnfp_AvailableforsalesecuritiestransferredtoHeldtoMaturity_ee95c54e-693d-4a64-a749-b043b5478a6c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_UnrealizedAfterTaxGainLossOnAvailableForSaleSecuritiesTransferredToTheHeldToMaturityPortfolio_c39a749c-dd00-4b00-af1e-acf2f1ab4e37" xlink:href="pnfp-20250930.xsd#pnfp_UnrealizedAfterTaxGainLossOnAvailableForSaleSecuritiesTransferredToTheHeldToMaturityPortfolio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_a654f952-0405-4cb8-89b2-74a4507912f5" xlink:to="loc_pnfp_UnrealizedAfterTaxGainLossOnAvailableForSaleSecuritiesTransferredToTheHeldToMaturityPortfolio_c39a749c-dd00-4b00-af1e-acf2f1ab4e37" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesLoanedAndSecuritiesSoldUnderAgreementToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement_5a641946-3e93-4206-8389-cfe1ab316a0d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuritiesLoanedAndSecuritiesSoldUnderAgreementToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_a654f952-0405-4cb8-89b2-74a4507912f5" xlink:to="loc_us-gaap_SecuritiesLoanedAndSecuritiesSoldUnderAgreementToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement_5a641946-3e93-4206-8389-cfe1ab316a0d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_0cde35fe-0ddf-4322-805f-a6e49df22f33" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_a654f952-0405-4cb8-89b2-74a4507912f5" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_0cde35fe-0ddf-4322-805f-a6e49df22f33" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_254a93fa-ad02-4c15-9e06-32dc2de39fbc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_a654f952-0405-4cb8-89b2-74a4507912f5" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_254a93fa-ad02-4c15-9e06-32dc2de39fbc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt_c7964973-2b7e-4803-a91b-abb8af14be77" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_a654f952-0405-4cb8-89b2-74a4507912f5" xlink:to="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt_c7964973-2b7e-4803-a91b-abb8af14be77" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGain_ed889018-fe88-4110-9b50-1ec8a1870fe9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleRealizedGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_a654f952-0405-4cb8-89b2-74a4507912f5" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGain_ed889018-fe88-4110-9b50-1ec8a1870fe9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss_e550550a-40af-435f-96e4-eaddc5ad21d7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_a654f952-0405-4cb8-89b2-74a4507912f5" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss_e550550a-40af-435f-96e4-eaddc5ad21d7" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsOwnedAtFairValue_b8e143fe-694a-4615-a541-71321eccccdb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentsOwnedAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_a654f952-0405-4cb8-89b2-74a4507912f5" xlink:to="loc_us-gaap_FinancialInstrumentsOwnedAtFairValue_b8e143fe-694a-4615-a541-71321eccccdb" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss_b86f7b7a-c0df-48d4-be1c-b66a0b75fd08" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_a654f952-0405-4cb8-89b2-74a4507912f5" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss_b86f7b7a-c0df-48d4-be1c-b66a0b75fd08" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/SecuritiesAmortizedCostandFairValueofSecuritiesDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#SecuritiesAmortizedCostandFairValueofSecuritiesDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/SecuritiesAmortizedCostandFairValueofSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_7eaa939d-296c-4f9a-ab8d-8f5c52945243" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_d64bd74e-6142-43a2-b03a-ba55af218b27" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_7eaa939d-296c-4f9a-ab8d-8f5c52945243" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_d64bd74e-6142-43a2-b03a-ba55af218b27" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_c1f640f2-90bc-4f6d-8756-6edcc788cd0c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_d64bd74e-6142-43a2-b03a-ba55af218b27" xlink:to="loc_us-gaap_FinancialInstrumentAxis_c1f640f2-90bc-4f6d-8756-6edcc788cd0c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_c1f640f2-90bc-4f6d-8756-6edcc788cd0c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_c1f640f2-90bc-4f6d-8756-6edcc788cd0c" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_c1f640f2-90bc-4f6d-8756-6edcc788cd0c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3d337b9e-a38c-4987-8f8e-bb08a66a704f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_c1f640f2-90bc-4f6d-8756-6edcc788cd0c" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3d337b9e-a38c-4987-8f8e-bb08a66a704f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasurySecuritiesMember_2744a431-1483-43f2-a509-ff754a6fa9ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USTreasurySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3d337b9e-a38c-4987-8f8e-bb08a66a704f" xlink:to="loc_us-gaap_USTreasurySecuritiesMember_2744a431-1483-43f2-a509-ff754a6fa9ee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_98677802-73f4-4c89-9afb-2aaa484e9cc0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USGovernmentAgenciesDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3d337b9e-a38c-4987-8f8e-bb08a66a704f" xlink:to="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_98677802-73f4-4c89-9afb-2aaa484e9cc0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_533dc0c1-55c6-46b7-8790-869ae4cf2ce8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3d337b9e-a38c-4987-8f8e-bb08a66a704f" xlink:to="loc_us-gaap_MortgageBackedSecuritiesMember_533dc0c1-55c6-46b7-8790-869ae4cf2ce8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_0a61ae03-d663-4070-9d3c-4a5ea29d4004" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3d337b9e-a38c-4987-8f8e-bb08a66a704f" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_0a61ae03-d663-4070-9d3c-4a5ea29d4004" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_7e5f98ff-ca08-4bde-919c-e5f42ee697f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3d337b9e-a38c-4987-8f8e-bb08a66a704f" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_7e5f98ff-ca08-4bde-919c-e5f42ee697f5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_25a20056-f97f-4a76-adae-0fd46c6baada" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3d337b9e-a38c-4987-8f8e-bb08a66a704f" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_25a20056-f97f-4a76-adae-0fd46c6baada" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_51672a3e-9be6-45c4-a1dd-a7dc9c6fa819" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_7eaa939d-296c-4f9a-ab8d-8f5c52945243" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_51672a3e-9be6-45c4-a1dd-a7dc9c6fa819" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesAbstract_fe99f676-ebf8-4f47-a5e4-6835d2524ec3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_51672a3e-9be6-45c4-a1dd-a7dc9c6fa819" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesAbstract_fe99f676-ebf8-4f47-a5e4-6835d2524ec3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_b851319f-dbf1-40ad-9a8d-db989c538b18" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_fe99f676-ebf8-4f47-a5e4-6835d2524ec3" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_b851319f-dbf1-40ad-9a8d-db989c538b18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_f9623f4f-1518-46b2-a5f9-cd6d77635b08" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_fe99f676-ebf8-4f47-a5e4-6835d2524ec3" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_f9623f4f-1518-46b2-a5f9-cd6d77635b08" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_3b4bea27-da06-459f-af0b-2be05e31d27e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_fe99f676-ebf8-4f47-a5e4-6835d2524ec3" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_3b4bea27-da06-459f-af0b-2be05e31d27e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_100e728d-c22b-426f-ae98-d2a158274cd5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_fe99f676-ebf8-4f47-a5e4-6835d2524ec3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_100e728d-c22b-426f-ae98-d2a158274cd5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_03df012c-d6ef-4097-8b64-76d2cc29a0b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_51672a3e-9be6-45c4-a1dd-a7dc9c6fa819" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_03df012c-d6ef-4097-8b64-76d2cc29a0b3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_cbf0f0b5-9fac-4cbf-bddc-a886290e42da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_03df012c-d6ef-4097-8b64-76d2cc29a0b3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_cbf0f0b5-9fac-4cbf-bddc-a886290e42da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_f7e0d109-0038-4950-9b1a-ea203deea447" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_03df012c-d6ef-4097-8b64-76d2cc29a0b3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_f7e0d109-0038-4950-9b1a-ea203deea447" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_b7682596-9ce4-43eb-9f5d-5b8b8159d2b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_03df012c-d6ef-4097-8b64-76d2cc29a0b3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_b7682596-9ce4-43eb-9f5d-5b8b8159d2b5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost_8a3bb2b1-7eff-4cb4-9df5-024ac6dc8e1b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_03df012c-d6ef-4097-8b64-76d2cc29a0b3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost_8a3bb2b1-7eff-4cb4-9df5-024ac6dc8e1b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_2767e5de-1285-4273-9d38-ad89389a52bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_03df012c-d6ef-4097-8b64-76d2cc29a0b3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_2767e5de-1285-4273-9d38-ad89389a52bf" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_AvailableForSaleSecuritiesDebtMaturitiesAssetsBackedSecuritiesAmortizedCost_d79f91cc-5f02-4cac-8141-683a5d094997" xlink:href="pnfp-20250930.xsd#pnfp_AvailableForSaleSecuritiesDebtMaturitiesAssetsBackedSecuritiesAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_03df012c-d6ef-4097-8b64-76d2cc29a0b3" xlink:to="loc_pnfp_AvailableForSaleSecuritiesDebtMaturitiesAssetsBackedSecuritiesAmortizedCost_d79f91cc-5f02-4cac-8141-683a5d094997" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_94f8ce53-0bba-4a26-bf43-63d7fa4dda41" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_76216193-54c9-450e-9c0b-2f024313d536" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_51672a3e-9be6-45c4-a1dd-a7dc9c6fa819" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_76216193-54c9-450e-9c0b-2f024313d536" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_dbfd9d7f-30cd-4576-a7da-2ec0e36ee9b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_76216193-54c9-450e-9c0b-2f024313d536" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_dbfd9d7f-30cd-4576-a7da-2ec0e36ee9b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_6431c75e-895f-4aa6-870c-5730e470923a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_76216193-54c9-450e-9c0b-2f024313d536" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_6431c75e-895f-4aa6-870c-5730e470923a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_93805c20-413d-4f38-8ea7-c98ee5ec4122" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_76216193-54c9-450e-9c0b-2f024313d536" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_93805c20-413d-4f38-8ea7-c98ee5ec4122" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_b78290df-c8f0-4715-b03a-4cf682f60544" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_76216193-54c9-450e-9c0b-2f024313d536" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_b78290df-c8f0-4715-b03a-4cf682f60544" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_21102739-d347-4138-91e3-e8b6f360a6ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_76216193-54c9-450e-9c0b-2f024313d536" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_21102739-d347-4138-91e3-e8b6f360a6ad" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_AvailableForSaleSecuritiesDebtMaturitiesAssetBackedSecuritiesFairValue_c4fe0852-9b72-4557-b496-64b4035ef37a" xlink:href="pnfp-20250930.xsd#pnfp_AvailableForSaleSecuritiesDebtMaturitiesAssetBackedSecuritiesFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_76216193-54c9-450e-9c0b-2f024313d536" xlink:to="loc_pnfp_AvailableForSaleSecuritiesDebtMaturitiesAssetBackedSecuritiesFairValue_c4fe0852-9b72-4557-b496-64b4035ef37a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_52259df9-bff6-495b-a737-56187698fb96" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_7bb0c57a-0d6d-448b-b95c-dc6c11600de0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesTable_47a8303e-12b2-4e4e-ae04-21487d76173d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfHeldToMaturitySecuritiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_7bb0c57a-0d6d-448b-b95c-dc6c11600de0" xlink:to="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesTable_47a8303e-12b2-4e4e-ae04-21487d76173d" xlink:type="arc" order="2" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_e8ea8dd1-e12d-4acb-8bb4-e9b1c3e7e633" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesTable_47a8303e-12b2-4e4e-ae04-21487d76173d" xlink:to="loc_us-gaap_FinancialInstrumentAxis_e8ea8dd1-e12d-4acb-8bb4-e9b1c3e7e633" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_e8ea8dd1-e12d-4acb-8bb4-e9b1c3e7e633_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_307fe821-f299-4d34-ad11-4ac2201d4b39" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasurySecuritiesMember_9e2a42bd-43be-45e6-983f-0e950cd2035d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USTreasurySecuritiesMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_d705cd59-e712-4e0d-b977-62882b04977d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USGovernmentAgenciesDebtSecuritiesMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_245173ef-c008-47c7-b807-423a0416dfed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MortgageBackedSecuritiesMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_cafff106-501c-412a-867e-7f31e18b497b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_bf13d08c-1d6e-4e11-aa02-870b97ab8e24" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_7ae650cb-b744-424c-9ee0-d9716d4f8b1b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesAbstract_881065d2-5311-4c57-a2d8-39a82d60e305" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_7bb0c57a-0d6d-448b-b95c-dc6c11600de0" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesAbstract_881065d2-5311-4c57-a2d8-39a82d60e305" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecurities_b1b5594c-b05d-4f6d-b15f-21e7455f22f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesAbstract_881065d2-5311-4c57-a2d8-39a82d60e305" xlink:to="loc_us-gaap_HeldToMaturitySecurities_b1b5594c-b05d-4f6d-b15f-21e7455f22f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain_597f1b8d-a055-4501-841d-fe7c4c2bb41e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesAbstract_881065d2-5311-4c57-a2d8-39a82d60e305" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain_597f1b8d-a055-4501-841d-fe7c4c2bb41e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_1db049ce-9f6c-4f59-8ba1-7d5045cdf0d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesAbstract_881065d2-5311-4c57-a2d8-39a82d60e305" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_1db049ce-9f6c-4f59-8ba1-7d5045cdf0d5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesFairValue_f90f60c2-9822-47dd-8b7b-1c33b095fd27" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesAbstract_881065d2-5311-4c57-a2d8-39a82d60e305" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesFairValue_f90f60c2-9822-47dd-8b7b-1c33b095fd27" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAllowanceForCreditLoss_a484cc3a-0b6b-4a4e-8a76-7334338318bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesHeldToMaturityAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesAbstract_881065d2-5311-4c57-a2d8-39a82d60e305" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAllowanceForCreditLoss_a484cc3a-0b6b-4a4e-8a76-7334338318bd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss_14b0a26f-08e9-44bb-8ea6-f6135ca34106" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesAbstract_881065d2-5311-4c57-a2d8-39a82d60e305" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAmortizedCostAfterAllowanceForCreditLoss_14b0a26f-08e9-44bb-8ea6-f6135ca34106" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNetCarryingAmountAbstract_5a7b4288-c12f-4879-a3a3-11c888c4c46b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNetCarryingAmountAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_7bb0c57a-0d6d-448b-b95c-dc6c11600de0" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNetCarryingAmountAbstract_5a7b4288-c12f-4879-a3a3-11c888c4c46b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount_54de83ea-63fa-4faf-b317-0c008bbdd468" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNetCarryingAmountAbstract_5a7b4288-c12f-4879-a3a3-11c888c4c46b" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount_54de83ea-63fa-4faf-b317-0c008bbdd468" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount_76875eac-9458-43e9-bbc1-affce8adb9c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNetCarryingAmountAbstract_5a7b4288-c12f-4879-a3a3-11c888c4c46b" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount_76875eac-9458-43e9-bbc1-affce8adb9c7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount_51da265c-1f89-4874-abd9-5aa81b37ab26" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNetCarryingAmountAbstract_5a7b4288-c12f-4879-a3a3-11c888c4c46b" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount_51da265c-1f89-4874-abd9-5aa81b37ab26" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount_07a4ff80-e8d9-4874-ad8d-4a7c57a7724f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNetCarryingAmountAbstract_5a7b4288-c12f-4879-a3a3-11c888c4c46b" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount_07a4ff80-e8d9-4874-ad8d-4a7c57a7724f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount_a31c6e1d-ad4e-4ed7-b089-00a5ecf5713c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNetCarryingAmountAbstract_5a7b4288-c12f-4879-a3a3-11c888c4c46b" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount_a31c6e1d-ad4e-4ed7-b089-00a5ecf5713c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_HeldToMaturitySecuritiesDebtMaturitiesAssetBackedSecuritiesAmortizedCost_c6045418-d38c-46eb-85fe-32d097ce2b40" xlink:href="pnfp-20250930.xsd#pnfp_HeldToMaturitySecuritiesDebtMaturitiesAssetBackedSecuritiesAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNetCarryingAmountAbstract_5a7b4288-c12f-4879-a3a3-11c888c4c46b" xlink:to="loc_pnfp_HeldToMaturitySecuritiesDebtMaturitiesAssetBackedSecuritiesAmortizedCost_c6045418-d38c-46eb-85fe-32d097ce2b40" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecurities_d51974b9-b28f-4e35-845f-39398d35626a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecurities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesFairValueAbstract_45204dcf-7c70-445b-876e-5721e1b87157" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesFairValueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfHeldToMaturitySecuritiesLineItems_7bb0c57a-0d6d-448b-b95c-dc6c11600de0" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesFairValueAbstract_45204dcf-7c70-445b-876e-5721e1b87157" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue_0ed0e6f1-f98a-42cc-88dc-914f87f2b945" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesFairValueAbstract_45204dcf-7c70-445b-876e-5721e1b87157" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue_0ed0e6f1-f98a-42cc-88dc-914f87f2b945" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_a3edad73-8e94-4861-b41b-155cd9febf83" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesFairValueAbstract_45204dcf-7c70-445b-876e-5721e1b87157" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_a3edad73-8e94-4861-b41b-155cd9febf83" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_b2212eea-e1bc-4426-b9e9-49909c28ac51" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesFairValueAbstract_45204dcf-7c70-445b-876e-5721e1b87157" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_b2212eea-e1bc-4426-b9e9-49909c28ac51" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue_acc58de2-dcbd-4048-bbf9-a9069233b1cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesFairValueAbstract_45204dcf-7c70-445b-876e-5721e1b87157" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue_acc58de2-dcbd-4048-bbf9-a9069233b1cf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_56e45c9b-551e-4b60-b0e7-8dee21df967e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesFairValueAbstract_45204dcf-7c70-445b-876e-5721e1b87157" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_56e45c9b-551e-4b60-b0e7-8dee21df967e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_HeldToMaturitySecuritiesDebtMaturitiesAssetBackedSecuritiesFairValue_bbbbdd22-af09-4526-b331-4739aba47306" xlink:href="pnfp-20250930.xsd#pnfp_HeldToMaturitySecuritiesDebtMaturitiesAssetBackedSecuritiesFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesDebtMaturitiesFairValueAbstract_45204dcf-7c70-445b-876e-5721e1b87157" xlink:to="loc_pnfp_HeldToMaturitySecuritiesDebtMaturitiesAssetBackedSecuritiesFairValue_bbbbdd22-af09-4526-b331-4739aba47306" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesFairValue_250870ec-91a5-428c-839e-cec30b6c7e29" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/SecuritiesUnrealizedLossesDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#SecuritiesUnrealizedLossesDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/SecuritiesUnrealizedLossesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_86b4e6d5-e9aa-4b05-a1db-68b3bb2a6f90" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_d5cdc476-e69e-482e-9ee1-f663d8f3baa5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_86b4e6d5-e9aa-4b05-a1db-68b3bb2a6f90" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_d5cdc476-e69e-482e-9ee1-f663d8f3baa5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_b4ec4e18-4c95-4bee-a2a3-419fcd9b43ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_d5cdc476-e69e-482e-9ee1-f663d8f3baa5" xlink:to="loc_us-gaap_FinancialInstrumentAxis_b4ec4e18-4c95-4bee-a2a3-419fcd9b43ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_b4ec4e18-4c95-4bee-a2a3-419fcd9b43ac_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_b4ec4e18-4c95-4bee-a2a3-419fcd9b43ac" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_b4ec4e18-4c95-4bee-a2a3-419fcd9b43ac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3325e6b2-bad1-4895-85fa-ff9c44e074a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_b4ec4e18-4c95-4bee-a2a3-419fcd9b43ac" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3325e6b2-bad1-4895-85fa-ff9c44e074a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasurySecuritiesMember_e145a3a1-eef5-44c9-90ac-4a22b3aea6f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USTreasurySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3325e6b2-bad1-4895-85fa-ff9c44e074a5" xlink:to="loc_us-gaap_USTreasurySecuritiesMember_e145a3a1-eef5-44c9-90ac-4a22b3aea6f8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_2933585c-3c76-47a4-8de6-c1db1320a0b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USGovernmentAgenciesDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3325e6b2-bad1-4895-85fa-ff9c44e074a5" xlink:to="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_2933585c-3c76-47a4-8de6-c1db1320a0b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesMember_9c298ae5-f6b8-4be9-ba61-60d6b83d9ca9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3325e6b2-bad1-4895-85fa-ff9c44e074a5" xlink:to="loc_us-gaap_MortgageBackedSecuritiesMember_9c298ae5-f6b8-4be9-ba61-60d6b83d9ca9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_251555f0-2d07-41a5-ad0c-bd2678d05a55" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3325e6b2-bad1-4895-85fa-ff9c44e074a5" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_251555f0-2d07-41a5-ad0c-bd2678d05a55" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_6fa91386-cf0a-49fc-9067-7a7d870e9a95" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3325e6b2-bad1-4895-85fa-ff9c44e074a5" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_6fa91386-cf0a-49fc-9067-7a7d870e9a95" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_8c90a07b-8eb0-485c-8f7d-f4bbe86df42c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3325e6b2-bad1-4895-85fa-ff9c44e074a5" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_8c90a07b-8eb0-485c-8f7d-f4bbe86df42c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_5e30796c-0676-4dfc-a6d4-16771886a3b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_86b4e6d5-e9aa-4b05-a1db-68b3bb2a6f90" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_5e30796c-0676-4dfc-a6d4-16771886a3b3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_4bf46ebc-7206-4900-85ce-6af68ea74f76" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_86b4e6d5-e9aa-4b05-a1db-68b3bb2a6f90" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_4bf46ebc-7206-4900-85ce-6af68ea74f76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_ca58c9ae-b0f8-4389-9297-09dacefef963" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_86b4e6d5-e9aa-4b05-a1db-68b3bb2a6f90" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_ca58c9ae-b0f8-4389-9297-09dacefef963" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_0deb7d96-0da4-46ea-bca3-3d412a12ae4d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_86b4e6d5-e9aa-4b05-a1db-68b3bb2a6f90" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_0deb7d96-0da4-46ea-bca3-3d412a12ae4d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_9fa7cc5f-e42c-4761-8812-4c7906d8bb9f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_86b4e6d5-e9aa-4b05-a1db-68b3bb2a6f90" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_9fa7cc5f-e42c-4761-8812-4c7906d8bb9f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_b5807c31-f7ed-4c54-886a-70c27ab3ed92" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_86b4e6d5-e9aa-4b05-a1db-68b3bb2a6f90" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_b5807c31-f7ed-4c54-886a-70c27ab3ed92" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/LoansandAllowanceforCreditLossesNarrativeDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#LoansandAllowanceforCreditLossesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/LoansandAllowanceforCreditLossesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_7b9340b8-415f-4977-b2e0-005dce4ea435" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_03cf9087-8e66-429c-b11f-c25c4bf47c9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_7b9340b8-415f-4977-b2e0-005dce4ea435" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_03cf9087-8e66-429c-b11f-c25c4bf47c9b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_06741bb8-89e6-4553-a7e1-cfd1a6054b49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_03cf9087-8e66-429c-b11f-c25c4bf47c9b" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_06741bb8-89e6-4553-a7e1-cfd1a6054b49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_06741bb8-89e6-4553-a7e1-cfd1a6054b49_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_06741bb8-89e6-4553-a7e1-cfd1a6054b49" xlink:to="loc_us-gaap_SegmentDomain_06741bb8-89e6-4553-a7e1-cfd1a6054b49_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_31568311-f85c-46ac-aa20-0a95217893fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_06741bb8-89e6-4553-a7e1-cfd1a6054b49" xlink:to="loc_us-gaap_SegmentDomain_31568311-f85c-46ac-aa20-0a95217893fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember_53da5a53-3de4-4ac1-b0bf-c605f68c9951" xlink:href="pnfp-20250930.xsd#pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_31568311-f85c-46ac-aa20-0a95217893fc" xlink:to="loc_pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember_53da5a53-3de4-4ac1-b0bf-c605f68c9951" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_NonowneroccupiedcommercialrealestateandmultifamilyloansMember_0007e39d-6ad9-4b03-b425-7dfd95a651a8" xlink:href="pnfp-20250930.xsd#pnfp_NonowneroccupiedcommercialrealestateandmultifamilyloansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_31568311-f85c-46ac-aa20-0a95217893fc" xlink:to="loc_pnfp_NonowneroccupiedcommercialrealestateandmultifamilyloansMember_0007e39d-6ad9-4b03-b425-7dfd95a651a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_aec43687-4ff7-4b6f-8117-4d37a2542070" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_03cf9087-8e66-429c-b11f-c25c4bf47c9b" xlink:to="loc_srt_ProductOrServiceAxis_aec43687-4ff7-4b6f-8117-4d37a2542070" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_aec43687-4ff7-4b6f-8117-4d37a2542070_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_aec43687-4ff7-4b6f-8117-4d37a2542070" xlink:to="loc_srt_ProductsAndServicesDomain_aec43687-4ff7-4b6f-8117-4d37a2542070_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_08140735-aaac-4be6-b9d7-06c4e8201832" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_aec43687-4ff7-4b6f-8117-4d37a2542070" xlink:to="loc_srt_ProductsAndServicesDomain_08140735-aaac-4be6-b9d7-06c4e8201832" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBankingMember_619ee1ba-26b9-4799-9ed0-f6d5051940c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MortgageBankingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_08140735-aaac-4be6-b9d7-06c4e8201832" xlink:to="loc_us-gaap_MortgageBankingMember_619ee1ba-26b9-4799-9ed0-f6d5051940c0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome_4a832e3a-306f-48ce-a7ce-1a43aff3b22f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_7b9340b8-415f-4977-b2e0-005dce4ea435" xlink:to="loc_us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome_4a832e3a-306f-48ce-a7ce-1a43aff3b22f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_PercentageOfLoanPortfolioAsCommercialLoan_f503530f-2b22-49f8-8eb5-8c8aabe206ac" xlink:href="pnfp-20250930.xsd#pnfp_PercentageOfLoanPortfolioAsCommercialLoan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_7b9340b8-415f-4977-b2e0-005dce4ea435" xlink:to="loc_pnfp_PercentageOfLoanPortfolioAsCommercialLoan_f503530f-2b22-49f8-8eb5-8c8aabe206ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_RiskRatedLoans_2b584973-4586-4274-ba56-1ffc55144aa5" xlink:href="pnfp-20250930.xsd#pnfp_RiskRatedLoans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_7b9340b8-415f-4977-b2e0-005dce4ea435" xlink:to="loc_pnfp_RiskRatedLoans_2b584973-4586-4274-ba56-1ffc55144aa5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_PercentageOfCreditExposureToRiskBasedCapital_b63f1410-52d1-4f60-8b59-2baec8c85442" xlink:href="pnfp-20250930.xsd#pnfp_PercentageOfCreditExposureToRiskBasedCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_7b9340b8-415f-4977-b2e0-005dce4ea435" xlink:to="loc_pnfp_PercentageOfCreditExposureToRiskBasedCapital_b63f1410-52d1-4f60-8b59-2baec8c85442" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_LoansAndLeasesMaximumPermissibleReceivableRelatedParties_1a6c5aeb-ad9f-4616-a961-061713f3c70a" xlink:href="pnfp-20250930.xsd#pnfp_LoansAndLeasesMaximumPermissibleReceivableRelatedParties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_7b9340b8-415f-4977-b2e0-005dce4ea435" xlink:to="loc_pnfp_LoansAndLeasesMaximumPermissibleReceivableRelatedParties_1a6c5aeb-ad9f-4616-a961-061713f3c70a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableRelatedParties_a3132dd3-5e4c-4c05-9865-196ed74cd9da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansAndLeasesReceivableRelatedParties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_7b9340b8-415f-4977-b2e0-005dce4ea435" xlink:to="loc_us-gaap_LoansAndLeasesReceivableRelatedParties_a3132dd3-5e4c-4c05-9865-196ed74cd9da" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableHeldForSaleAmount_b21005c0-61cb-477e-bdc1-5059207bd405" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansReceivableHeldForSaleAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_7b9340b8-415f-4977-b2e0-005dce4ea435" xlink:to="loc_us-gaap_LoansReceivableHeldForSaleAmount_b21005c0-61cb-477e-bdc1-5059207bd405" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_Mortgageloansheldforsale_0d3f82fe-7069-4af8-ae5f-9f1f1f1c0855" xlink:href="pnfp-20250930.xsd#pnfp_Mortgageloansheldforsale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_7b9340b8-415f-4977-b2e0-005dce4ea435" xlink:to="loc_pnfp_Mortgageloansheldforsale_0d3f82fe-7069-4af8-ae5f-9f1f1f1c0855" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale_49c6fdb5-d5c1-4541-8663-07e26a59dcad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_7b9340b8-415f-4977-b2e0-005dce4ea435" xlink:to="loc_us-gaap_ProceedsFromSaleOfMortgageLoansHeldForSale_49c6fdb5-d5c1-4541-8663-07e26a59dcad" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfMortgageLoans_9697501b-8ea6-47ff-ad44-0736aa145250" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnSaleOfMortgageLoans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_7b9340b8-415f-4977-b2e0-005dce4ea435" xlink:to="loc_us-gaap_GainLossOnSaleOfMortgageLoans_9697501b-8ea6-47ff-ad44-0736aa145250" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_ConsumerLoansHeldForSaleExcludingMortgageLoans_953f9aad-ba3e-48c4-91cf-c1b91ed63c0f" xlink:href="pnfp-20250930.xsd#pnfp_ConsumerLoansHeldForSaleExcludingMortgageLoans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_7b9340b8-415f-4977-b2e0-005dce4ea435" xlink:to="loc_pnfp_ConsumerLoansHeldForSaleExcludingMortgageLoans_953f9aad-ba3e-48c4-91cf-c1b91ed63c0f" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/LoansandAllowanceforCreditLossesDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#LoansandAllowanceforCreditLossesDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/LoansandAllowanceforCreditLossesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_de202357-6d61-4205-8836-804a2ee704b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_7658634d-bbda-4a08-a638-b1b65b554813" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_de202357-6d61-4205-8836-804a2ee704b4" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_7658634d-bbda-4a08-a638-b1b65b554813" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_b3268a5b-1db2-459d-ae0a-4731e4107ed5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_7658634d-bbda-4a08-a638-b1b65b554813" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_b3268a5b-1db2-459d-ae0a-4731e4107ed5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_b3268a5b-1db2-459d-ae0a-4731e4107ed5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_b3268a5b-1db2-459d-ae0a-4731e4107ed5" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_b3268a5b-1db2-459d-ae0a-4731e4107ed5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_5d3b8ffd-9c5c-4767-96e9-dc54e447d15a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_b3268a5b-1db2-459d-ae0a-4731e4107ed5" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_5d3b8ffd-9c5c-4767-96e9-dc54e447d15a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CommercialRealEstateOwnerOccupiedMember_15c77348-b7d4-44a9-8a30-812409c8cf24" xlink:href="pnfp-20250930.xsd#pnfp_CommercialRealEstateOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_5d3b8ffd-9c5c-4767-96e9-dc54e447d15a" xlink:to="loc_pnfp_CommercialRealEstateOwnerOccupiedMember_15c77348-b7d4-44a9-8a30-812409c8cf24" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CommercialRealEstateNonOwnerOccupiedMember_5a4d2276-d66a-4bd8-946a-043ba229e1ae" xlink:href="pnfp-20250930.xsd#pnfp_CommercialRealEstateNonOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_5d3b8ffd-9c5c-4767-96e9-dc54e447d15a" xlink:to="loc_pnfp_CommercialRealEstateNonOwnerOccupiedMember_5a4d2276-d66a-4bd8-946a-043ba229e1ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialRealEstateMember_a5435732-940b-4eff-b979-1631140bec01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_5d3b8ffd-9c5c-4767-96e9-dc54e447d15a" xlink:to="loc_us-gaap_ResidentialRealEstateMember_a5435732-940b-4eff-b979-1631140bec01" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember_2a96f2f1-6595-403b-b8c2-0e62d1ff2778" xlink:href="pnfp-20250930.xsd#pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_5d3b8ffd-9c5c-4767-96e9-dc54e447d15a" xlink:to="loc_pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember_2a96f2f1-6595-403b-b8c2-0e62d1ff2778" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CommercialandIndustrialPortfolioSegmentMember_0faefd84-5ba5-4b8a-ae00-552366352d03" xlink:href="pnfp-20250930.xsd#pnfp_CommercialandIndustrialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_5d3b8ffd-9c5c-4767-96e9-dc54e447d15a" xlink:to="loc_pnfp_CommercialandIndustrialPortfolioSegmentMember_0faefd84-5ba5-4b8a-ae00-552366352d03" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_a0b01723-e1ff-4041-9641-98f438291b31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_5d3b8ffd-9c5c-4767-96e9-dc54e447d15a" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_a0b01723-e1ff-4041-9641-98f438291b31" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageMember_65d847ef-7f95-4661-b7ca-b62f5cc3331a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_5d3b8ffd-9c5c-4767-96e9-dc54e447d15a" xlink:to="loc_us-gaap_ResidentialMortgageMember_65d847ef-7f95-4661-b7ca-b62f5cc3331a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome_26203220-e7ef-49b4-bf80-d23906ec2644" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_de202357-6d61-4205-8836-804a2ee704b4" xlink:to="loc_us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome_26203220-e7ef-49b4-bf80-d23906ec2644" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableAllowance_fc2e2d7a-b7a3-423b-a95a-491da628f401" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansAndLeasesReceivableAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_de202357-6d61-4205-8836-804a2ee704b4" xlink:to="loc_us-gaap_LoansAndLeasesReceivableAllowance_fc2e2d7a-b7a3-423b-a95a-491da628f401" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableGross_248a5101-93e5-4793-8807-d6b480cfafb6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesReceivableGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_de202357-6d61-4205-8836-804a2ee704b4" xlink:to="loc_us-gaap_NotesReceivableGross_248a5101-93e5-4793-8807-d6b480cfafb6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_6bfa6683-0756-4713-849f-018c6960567b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_de202357-6d61-4205-8836-804a2ee704b4" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_6bfa6683-0756-4713-849f-018c6960567b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableNet_dbe040ad-af60-485b-a459-fd82d3ecb763" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesReceivableNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_de202357-6d61-4205-8836-804a2ee704b4" xlink:to="loc_us-gaap_NotesReceivableNet_dbe040ad-af60-485b-a459-fd82d3ecb763" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/LoansandAllowanceforCreditLossesLoanClassificationbyRiskRatingCategoryDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#LoansandAllowanceforCreditLossesLoanClassificationbyRiskRatingCategoryDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/LoansandAllowanceforCreditLossesLoanClassificationbyRiskRatingCategoryDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_aef3fc49-9839-4a70-a272-ad293577f2aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_e44313f8-33dd-4ef2-bbf0-ef26773907ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_aef3fc49-9839-4a70-a272-ad293577f2aa" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_e44313f8-33dd-4ef2-bbf0-ef26773907ac" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_e49bd81e-5d6c-4a96-8c1e-6bc1ccb3331c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_e44313f8-33dd-4ef2-bbf0-ef26773907ac" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_e49bd81e-5d6c-4a96-8c1e-6bc1ccb3331c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_e49bd81e-5d6c-4a96-8c1e-6bc1ccb3331c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_e49bd81e-5d6c-4a96-8c1e-6bc1ccb3331c" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_e49bd81e-5d6c-4a96-8c1e-6bc1ccb3331c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_4ef9a59b-4da1-4cf4-bb32-2955925aa7ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_e49bd81e-5d6c-4a96-8c1e-6bc1ccb3331c" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_4ef9a59b-4da1-4cf4-bb32-2955925aa7ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CommercialRealEstateOwnerOccupiedMember_e493696c-ada8-4b95-a713-5fb308f4ff4c" xlink:href="pnfp-20250930.xsd#pnfp_CommercialRealEstateOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_4ef9a59b-4da1-4cf4-bb32-2955925aa7ce" xlink:to="loc_pnfp_CommercialRealEstateOwnerOccupiedMember_e493696c-ada8-4b95-a713-5fb308f4ff4c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CommercialRealEstateNonOwnerOccupiedMember_20674638-dfde-41cb-a223-f8579730efe8" xlink:href="pnfp-20250930.xsd#pnfp_CommercialRealEstateNonOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_4ef9a59b-4da1-4cf4-bb32-2955925aa7ce" xlink:to="loc_pnfp_CommercialRealEstateNonOwnerOccupiedMember_20674638-dfde-41cb-a223-f8579730efe8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialRealEstateMember_39fe16f2-4b0e-425d-b5e0-303fa43df096" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_4ef9a59b-4da1-4cf4-bb32-2955925aa7ce" xlink:to="loc_us-gaap_ResidentialRealEstateMember_39fe16f2-4b0e-425d-b5e0-303fa43df096" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember_01764936-8554-440a-a748-a9f95abf91c5" xlink:href="pnfp-20250930.xsd#pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_4ef9a59b-4da1-4cf4-bb32-2955925aa7ce" xlink:to="loc_pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember_01764936-8554-440a-a748-a9f95abf91c5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CommercialandIndustrialPortfolioSegmentMember_811b5195-e1d3-4e2e-a1d5-e4d62cb82a63" xlink:href="pnfp-20250930.xsd#pnfp_CommercialandIndustrialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_4ef9a59b-4da1-4cf4-bb32-2955925aa7ce" xlink:to="loc_pnfp_CommercialandIndustrialPortfolioSegmentMember_811b5195-e1d3-4e2e-a1d5-e4d62cb82a63" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_048d98a3-fe76-41eb-bffe-2f1046649868" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_4ef9a59b-4da1-4cf4-bb32-2955925aa7ce" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_048d98a3-fe76-41eb-bffe-2f1046649868" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageMember_cb08ffb7-cd80-4cf9-84ee-fb1930849c85" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_4ef9a59b-4da1-4cf4-bb32-2955925aa7ce" xlink:to="loc_us-gaap_ResidentialMortgageMember_cb08ffb7-cd80-4cf9-84ee-fb1930849c85" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentAxis_1d3da67e-01db-493b-b161-85333d342666" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InternalCreditAssessmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_e44313f8-33dd-4ef2-bbf0-ef26773907ac" xlink:to="loc_us-gaap_InternalCreditAssessmentAxis_1d3da67e-01db-493b-b161-85333d342666" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_1d3da67e-01db-493b-b161-85333d342666_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InternalCreditAssessmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InternalCreditAssessmentAxis_1d3da67e-01db-493b-b161-85333d342666" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_1d3da67e-01db-493b-b161-85333d342666_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_ee265981-62fb-4684-9ada-6e3bdbbbae33" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InternalCreditAssessmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InternalCreditAssessmentAxis_1d3da67e-01db-493b-b161-85333d342666" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_ee265981-62fb-4684-9ada-6e3bdbbbae33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PassMember_49d6a883-e78c-4b16-9e43-0888d443e5ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PassMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_ee265981-62fb-4684-9ada-6e3bdbbbae33" xlink:to="loc_us-gaap_PassMember_49d6a883-e78c-4b16-9e43-0888d443e5ef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SpecialMentionMember_e4768aaa-fb8f-4065-bd36-02181ca48b0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SpecialMentionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_ee265981-62fb-4684-9ada-6e3bdbbbae33" xlink:to="loc_us-gaap_SpecialMentionMember_e4768aaa-fb8f-4065-bd36-02181ca48b0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_SubstandardAccrualMember_9cd4cc74-7e07-4414-8ee6-89aa16bdf06d" xlink:href="pnfp-20250930.xsd#pnfp_SubstandardAccrualMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_ee265981-62fb-4684-9ada-6e3bdbbbae33" xlink:to="loc_pnfp_SubstandardAccrualMember_9cd4cc74-7e07-4414-8ee6-89aa16bdf06d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_SubstandardNonacrrualMember_68ac9420-500f-4447-912a-2e5387283f53" xlink:href="pnfp-20250930.xsd#pnfp_SubstandardNonacrrualMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_ee265981-62fb-4684-9ada-6e3bdbbbae33" xlink:to="loc_pnfp_SubstandardNonacrrualMember_68ac9420-500f-4447-912a-2e5387283f53" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_DoubtfulNonaccrualMember_5143320e-fe9b-4545-a14c-95d2c478c5e1" xlink:href="pnfp-20250930.xsd#pnfp_DoubtfulNonaccrualMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_ee265981-62fb-4684-9ada-6e3bdbbbae33" xlink:to="loc_pnfp_DoubtfulNonaccrualMember_5143320e-fe9b-4545-a14c-95d2c478c5e1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_SubstandardNonaccrualMember_f2755b65-da99-41db-aaa5-af9886b77c9d" xlink:href="pnfp-20250930.xsd#pnfp_SubstandardNonaccrualMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_ee265981-62fb-4684-9ada-6e3bdbbbae33" xlink:to="loc_pnfp_SubstandardNonaccrualMember_f2755b65-da99-41db-aaa5-af9886b77c9d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralAxis_7270eb5a-2b58-4570-9254-beee30a73ca5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_e44313f8-33dd-4ef2-bbf0-ef26773907ac" xlink:to="loc_us-gaap_CollateralAxis_7270eb5a-2b58-4570-9254-beee30a73ca5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralDomain_7270eb5a-2b58-4570-9254-beee30a73ca5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CollateralAxis_7270eb5a-2b58-4570-9254-beee30a73ca5" xlink:to="loc_us-gaap_CollateralDomain_7270eb5a-2b58-4570-9254-beee30a73ca5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralDomain_6862b488-06b9-454f-b11e-d77f2d94228f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CollateralAxis_7270eb5a-2b58-4570-9254-beee30a73ca5" xlink:to="loc_us-gaap_CollateralDomain_6862b488-06b9-454f-b11e-d77f2d94228f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateMember_d230c7e8-e8ad-496f-af74-ba92c9ccb1c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CollateralDomain_6862b488-06b9-454f-b11e-d77f2d94228f" xlink:to="loc_us-gaap_RealEstateMember_d230c7e8-e8ad-496f-af74-ba92c9ccb1c0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_BusinessAssetsMember_fbb41509-4101-4acc-8925-211d9274ee96" xlink:href="pnfp-20250930.xsd#pnfp_BusinessAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CollateralDomain_6862b488-06b9-454f-b11e-d77f2d94228f" xlink:to="loc_pnfp_BusinessAssetsMember_fbb41509-4101-4acc-8925-211d9274ee96" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_OtherMember_2c75d6bb-54d3-444c-9b83-85b7639a5537" xlink:href="pnfp-20250930.xsd#pnfp_OtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CollateralDomain_6862b488-06b9-454f-b11e-d77f2d94228f" xlink:to="loc_pnfp_OtherMember_2c75d6bb-54d3-444c-9b83-85b7639a5537" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_YearOfOriginationAxis_2ad4929a-5fcb-4fc5-9fe0-cdcb2e0253f0" xlink:href="pnfp-20250930.xsd#pnfp_YearOfOriginationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_e44313f8-33dd-4ef2-bbf0-ef26773907ac" xlink:to="loc_pnfp_YearOfOriginationAxis_2ad4929a-5fcb-4fc5-9fe0-cdcb2e0253f0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_YearOfOriginationDomain_2ad4929a-5fcb-4fc5-9fe0-cdcb2e0253f0_default" xlink:href="pnfp-20250930.xsd#pnfp_YearOfOriginationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_pnfp_YearOfOriginationAxis_2ad4929a-5fcb-4fc5-9fe0-cdcb2e0253f0" xlink:to="loc_pnfp_YearOfOriginationDomain_2ad4929a-5fcb-4fc5-9fe0-cdcb2e0253f0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_YearOfOriginationDomain_2bd48814-bc6a-468e-815e-17a2eeda6dee" xlink:href="pnfp-20250930.xsd#pnfp_YearOfOriginationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_pnfp_YearOfOriginationAxis_2ad4929a-5fcb-4fc5-9fe0-cdcb2e0253f0" xlink:to="loc_pnfp_YearOfOriginationDomain_2bd48814-bc6a-468e-815e-17a2eeda6dee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_A2024Member_d84693f3-697a-458a-9cb4-aefb020cd6b9" xlink:href="pnfp-20250930.xsd#pnfp_A2024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_YearOfOriginationDomain_2bd48814-bc6a-468e-815e-17a2eeda6dee" xlink:to="loc_pnfp_A2024Member_d84693f3-697a-458a-9cb4-aefb020cd6b9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_A2023Member_cabadb06-fcc8-434d-ae61-e4b892c9330a" xlink:href="pnfp-20250930.xsd#pnfp_A2023Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_YearOfOriginationDomain_2bd48814-bc6a-468e-815e-17a2eeda6dee" xlink:to="loc_pnfp_A2023Member_cabadb06-fcc8-434d-ae61-e4b892c9330a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_A2022Member_429822ed-20f2-4234-b7e4-4cf70a063924" xlink:href="pnfp-20250930.xsd#pnfp_A2022Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_YearOfOriginationDomain_2bd48814-bc6a-468e-815e-17a2eeda6dee" xlink:to="loc_pnfp_A2022Member_429822ed-20f2-4234-b7e4-4cf70a063924" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_A2021Member_c21c1441-d940-4587-9848-b8909eba1168" xlink:href="pnfp-20250930.xsd#pnfp_A2021Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_YearOfOriginationDomain_2bd48814-bc6a-468e-815e-17a2eeda6dee" xlink:to="loc_pnfp_A2021Member_c21c1441-d940-4587-9848-b8909eba1168" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_A2020Member_11608c5d-1b63-4b4f-9c37-d1218247d386" xlink:href="pnfp-20250930.xsd#pnfp_A2020Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_YearOfOriginationDomain_2bd48814-bc6a-468e-815e-17a2eeda6dee" xlink:to="loc_pnfp_A2020Member_11608c5d-1b63-4b4f-9c37-d1218247d386" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_A2019Member_5f67eb41-3631-4f95-a7f5-9fdb405f96aa" xlink:href="pnfp-20250930.xsd#pnfp_A2019Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_YearOfOriginationDomain_2bd48814-bc6a-468e-815e-17a2eeda6dee" xlink:to="loc_pnfp_A2019Member_5f67eb41-3631-4f95-a7f5-9fdb405f96aa" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_PriorMember_de5f353f-c6f3-4ea1-9e9a-b7cb49c303dd" xlink:href="pnfp-20250930.xsd#pnfp_PriorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_YearOfOriginationDomain_2bd48814-bc6a-468e-815e-17a2eeda6dee" xlink:to="loc_pnfp_PriorMember_de5f353f-c6f3-4ea1-9e9a-b7cb49c303dd" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_RevolvingLoansMember_48fd1612-2324-4819-8f97-51394e0e6e38" xlink:href="pnfp-20250930.xsd#pnfp_RevolvingLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_YearOfOriginationDomain_2bd48814-bc6a-468e-815e-17a2eeda6dee" xlink:to="loc_pnfp_RevolvingLoansMember_48fd1612-2324-4819-8f97-51394e0e6e38" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_A2025Member_c66fbf1c-5145-4ef0-9d9e-2b9a96b5221d" xlink:href="pnfp-20250930.xsd#pnfp_A2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_pnfp_YearOfOriginationAxis_2ad4929a-5fcb-4fc5-9fe0-cdcb2e0253f0" xlink:to="loc_pnfp_A2025Member_c66fbf1c-5145-4ef0-9d9e-2b9a96b5221d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear_705ceecc-cb34-4330-a233-5793ee6a37e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_aef3fc49-9839-4a70-a272-ad293577f2aa" xlink:to="loc_us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear_705ceecc-cb34-4330-a233-5793ee6a37e7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear_50dd1235-d71f-4a64-b8da-373c2e62239f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_aef3fc49-9839-4a70-a272-ad293577f2aa" xlink:to="loc_us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear_50dd1235-d71f-4a64-b8da-373c2e62239f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear_3abd3c18-0ef9-413f-bba4-c1782154772f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_aef3fc49-9839-4a70-a272-ad293577f2aa" xlink:to="loc_us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear_3abd3c18-0ef9-413f-bba4-c1782154772f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear_c0a01da8-66a8-40ea-81be-eafce016dc2e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_aef3fc49-9839-4a70-a272-ad293577f2aa" xlink:to="loc_us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear_c0a01da8-66a8-40ea-81be-eafce016dc2e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear_02a718b6-1a41-412b-95a6-86701b95e290" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_aef3fc49-9839-4a70-a272-ad293577f2aa" xlink:to="loc_us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear_02a718b6-1a41-412b-95a6-86701b95e290" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear_874c8f73-260a-461e-834e-88262e48571f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_aef3fc49-9839-4a70-a272-ad293577f2aa" xlink:to="loc_us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear_874c8f73-260a-461e-834e-88262e48571f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRevolving_5784b1a7-dca3-41b2-8c85-2c38fa95dc5e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRevolving"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_aef3fc49-9839-4a70-a272-ad293577f2aa" xlink:to="loc_us-gaap_FinancingReceivableRevolving_5784b1a7-dca3-41b2-8c85-2c38fa95dc5e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome_770a3263-cb4e-486a-a739-0bd2a83face8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_aef3fc49-9839-4a70-a272-ad293577f2aa" xlink:to="loc_us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome_770a3263-cb4e-486a-a739-0bd2a83face8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs_918d0c2e-4bc0-4bc3-a52c-c7e69ce0a465" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_aef3fc49-9839-4a70-a272-ad293577f2aa" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs_918d0c2e-4bc0-4bc3-a52c-c7e69ce0a465" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_PotentialProblemLoans_49849dbc-d0b2-4de8-996e-b23a585c697c" xlink:href="pnfp-20250930.xsd#pnfp_PotentialProblemLoans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_aef3fc49-9839-4a70-a272-ad293577f2aa" xlink:to="loc_pnfp_PotentialProblemLoans_49849dbc-d0b2-4de8-996e-b23a585c697c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableGross_6bf28ebd-d108-419b-958b-4508f302b072" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesReceivableGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_aef3fc49-9839-4a70-a272-ad293577f2aa" xlink:to="loc_us-gaap_NotesReceivableGross_6bf28ebd-d108-419b-958b-4508f302b072" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/LoansandAllowanceforCreditLossesFinancingReceivablesPastDueDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#LoansandAllowanceforCreditLossesFinancingReceivablesPastDueDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/LoansandAllowanceforCreditLossesFinancingReceivablesPastDueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_544ac6d9-56f2-43f6-8508-50a7ce323c94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_77d6ca9d-f281-4483-83c3-5ebb3b8e37a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivablesPastDueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_544ac6d9-56f2-43f6-8508-50a7ce323c94" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_77d6ca9d-f281-4483-83c3-5ebb3b8e37a9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_4f805333-321b-44b1-99f0-8f19d7dd042a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_77d6ca9d-f281-4483-83c3-5ebb3b8e37a9" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_4f805333-321b-44b1-99f0-8f19d7dd042a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_4f805333-321b-44b1-99f0-8f19d7dd042a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_4f805333-321b-44b1-99f0-8f19d7dd042a" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_4f805333-321b-44b1-99f0-8f19d7dd042a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_bc8e019f-c2bb-4c1e-97e7-c14994e3ca89" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_4f805333-321b-44b1-99f0-8f19d7dd042a" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_bc8e019f-c2bb-4c1e-97e7-c14994e3ca89" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_59906dc1-3c2b-410d-87ac-3947d7bf7c4b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivables30To59DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_bc8e019f-c2bb-4c1e-97e7-c14994e3ca89" xlink:to="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_59906dc1-3c2b-410d-87ac-3947d7bf7c4b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_e1ec5fc8-bbcd-4164-8046-a0452c340dd2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivables60To89DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_bc8e019f-c2bb-4c1e-97e7-c14994e3ca89" xlink:to="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_e1ec5fc8-bbcd-4164-8046-a0452c340dd2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_ebf3a359-89e1-437c-8416-0594e7a6c3db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_bc8e019f-c2bb-4c1e-97e7-c14994e3ca89" xlink:to="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_ebf3a359-89e1-437c-8416-0594e7a6c3db" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetPastDueMember_58b655fd-4049-46e3-98da-4f0c52a9e41f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialAssetPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_bc8e019f-c2bb-4c1e-97e7-c14994e3ca89" xlink:to="loc_us-gaap_FinancialAssetPastDueMember_58b655fd-4049-46e3-98da-4f0c52a9e41f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetNotPastDueMember_c66656fe-bc3d-4c0c-b719-f865bad341f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialAssetNotPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_bc8e019f-c2bb-4c1e-97e7-c14994e3ca89" xlink:to="loc_us-gaap_FinancialAssetNotPastDueMember_c66656fe-bc3d-4c0c-b719-f865bad341f7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_cc64f4ea-2236-43bb-8ea2-4bee20eb2ca5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_77d6ca9d-f281-4483-83c3-5ebb3b8e37a9" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_cc64f4ea-2236-43bb-8ea2-4bee20eb2ca5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_cc64f4ea-2236-43bb-8ea2-4bee20eb2ca5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_cc64f4ea-2236-43bb-8ea2-4bee20eb2ca5" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_cc64f4ea-2236-43bb-8ea2-4bee20eb2ca5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_440a5332-fa02-4952-945d-c70d897d4021" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_cc64f4ea-2236-43bb-8ea2-4bee20eb2ca5" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_440a5332-fa02-4952-945d-c70d897d4021" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CommercialRealEstateOwnerOccupiedMember_d88da998-2ece-4eeb-ac49-f8983a24fa46" xlink:href="pnfp-20250930.xsd#pnfp_CommercialRealEstateOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_440a5332-fa02-4952-945d-c70d897d4021" xlink:to="loc_pnfp_CommercialRealEstateOwnerOccupiedMember_d88da998-2ece-4eeb-ac49-f8983a24fa46" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CommercialRealEstateNonOwnerOccupiedMember_56a8544b-867b-4de9-85ba-3c8bdb115c53" xlink:href="pnfp-20250930.xsd#pnfp_CommercialRealEstateNonOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_440a5332-fa02-4952-945d-c70d897d4021" xlink:to="loc_pnfp_CommercialRealEstateNonOwnerOccupiedMember_56a8544b-867b-4de9-85ba-3c8bdb115c53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialRealEstateMember_7b27457e-d953-4ba8-ba9d-b89e6ed049f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_440a5332-fa02-4952-945d-c70d897d4021" xlink:to="loc_us-gaap_ResidentialRealEstateMember_7b27457e-d953-4ba8-ba9d-b89e6ed049f0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember_834b5f40-f017-4c02-9659-2adac7472a81" xlink:href="pnfp-20250930.xsd#pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_440a5332-fa02-4952-945d-c70d897d4021" xlink:to="loc_pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember_834b5f40-f017-4c02-9659-2adac7472a81" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CommercialandIndustrialPortfolioSegmentMember_9567c3fc-e446-4f8c-81a6-e7e7b1af119d" xlink:href="pnfp-20250930.xsd#pnfp_CommercialandIndustrialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_440a5332-fa02-4952-945d-c70d897d4021" xlink:to="loc_pnfp_CommercialandIndustrialPortfolioSegmentMember_9567c3fc-e446-4f8c-81a6-e7e7b1af119d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_985a668d-5a95-4459-96be-3609fd19c6f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_440a5332-fa02-4952-945d-c70d897d4021" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_985a668d-5a95-4459-96be-3609fd19c6f2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageMember_c83b9918-fc82-495f-a1d0-47436caf25dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_440a5332-fa02-4952-945d-c70d897d4021" xlink:to="loc_us-gaap_ResidentialMortgageMember_c83b9918-fc82-495f-a1d0-47436caf25dd" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome_f422db0d-cf10-4a99-af96-f7b37b70f676" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_544ac6d9-56f2-43f6-8508-50a7ce323c94" xlink:to="loc_us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome_f422db0d-cf10-4a99-af96-f7b37b70f676" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableGross_f04e8949-b1ca-41c6-8b3d-6d9c776be728" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesReceivableGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_544ac6d9-56f2-43f6-8508-50a7ce323c94" xlink:to="loc_us-gaap_NotesReceivableGross_f04e8949-b1ca-41c6-8b3d-6d9c776be728" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/LoansandAllowanceforCreditLossesAllowanceforCreditLossesDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#LoansandAllowanceforCreditLossesAllowanceforCreditLossesDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/LoansandAllowanceforCreditLossesAllowanceforCreditLossesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_7ab94ce5-d758-48ec-ac0b-10707c8a96e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_c3f669b6-a7fb-4bf4-a3d6-d341c262029b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_7ab94ce5-d758-48ec-ac0b-10707c8a96e2" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_c3f669b6-a7fb-4bf4-a3d6-d341c262029b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_ddc929cf-ba1c-41ed-bb4a-0a361e454282" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_c3f669b6-a7fb-4bf4-a3d6-d341c262029b" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_ddc929cf-ba1c-41ed-bb4a-0a361e454282" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_ddc929cf-ba1c-41ed-bb4a-0a361e454282_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_ddc929cf-ba1c-41ed-bb4a-0a361e454282" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_ddc929cf-ba1c-41ed-bb4a-0a361e454282_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_74d87a92-05e0-4dda-9061-d69de83ce1d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_ddc929cf-ba1c-41ed-bb4a-0a361e454282" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_74d87a92-05e0-4dda-9061-d69de83ce1d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CommercialRealEstateOwnerOccupiedMember_b7937b91-7914-40bd-9956-bdce67f0633f" xlink:href="pnfp-20250930.xsd#pnfp_CommercialRealEstateOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_74d87a92-05e0-4dda-9061-d69de83ce1d5" xlink:to="loc_pnfp_CommercialRealEstateOwnerOccupiedMember_b7937b91-7914-40bd-9956-bdce67f0633f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CommercialandIndustrialPortfolioSegmentMember_4e37e0c9-d62f-4b3a-961e-be2d939b23f4" xlink:href="pnfp-20250930.xsd#pnfp_CommercialandIndustrialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_74d87a92-05e0-4dda-9061-d69de83ce1d5" xlink:to="loc_pnfp_CommercialandIndustrialPortfolioSegmentMember_4e37e0c9-d62f-4b3a-961e-be2d939b23f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialRealEstateMember_c59a790d-ac69-484b-808a-9c8beb6f5318" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_74d87a92-05e0-4dda-9061-d69de83ce1d5" xlink:to="loc_us-gaap_ResidentialRealEstateMember_c59a790d-ac69-484b-808a-9c8beb6f5318" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember_f1b7078e-daf5-4071-b6c5-14898e24fa94" xlink:href="pnfp-20250930.xsd#pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_74d87a92-05e0-4dda-9061-d69de83ce1d5" xlink:to="loc_pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember_f1b7078e-daf5-4071-b6c5-14898e24fa94" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_844ac7e3-be21-4b82-85cb-fdd508fe283a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_74d87a92-05e0-4dda-9061-d69de83ce1d5" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_844ac7e3-be21-4b82-85cb-fdd508fe283a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CommercialRealEstateNonOwnerOccupiedMember_de4b97dc-5232-47f7-8fd8-f394fb4e161c" xlink:href="pnfp-20250930.xsd#pnfp_CommercialRealEstateNonOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_74d87a92-05e0-4dda-9061-d69de83ce1d5" xlink:to="loc_pnfp_CommercialRealEstateNonOwnerOccupiedMember_de4b97dc-5232-47f7-8fd8-f394fb4e161c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageMember_124b0e6b-9ab7-45ab-947b-dc1f35af2b42" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_74d87a92-05e0-4dda-9061-d69de83ce1d5" xlink:to="loc_us-gaap_ResidentialMortgageMember_124b0e6b-9ab7-45ab-947b-dc1f35af2b42" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_6f4342f5-4359-418f-8fa1-3c43b3d2942b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_7ab94ce5-d758-48ec-ac0b-10707c8a96e2" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_6f4342f5-4359-418f-8fa1-3c43b3d2942b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_302ef4c2-fd4e-4535-9171-645e5fd8127c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_6f4342f5-4359-418f-8fa1-3c43b3d2942b" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_302ef4c2-fd4e-4535-9171-645e5fd8127c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs_944ea5ac-cd9a-4e72-add9-c427821ca463" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_6f4342f5-4359-418f-8fa1-3c43b3d2942b" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs_944ea5ac-cd9a-4e72-add9-c427821ca463" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery_cce2889f-65e5-4e07-9dea-6541efb969c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_6f4342f5-4359-418f-8fa1-3c43b3d2942b" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery_cce2889f-65e5-4e07-9dea-6541efb969c5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForLoanAndLeaseLosses_55f73fc8-201b-41e9-b649-8330ee16e3f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProvisionForLoanAndLeaseLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_6f4342f5-4359-418f-8fa1-3c43b3d2942b" xlink:to="loc_us-gaap_ProvisionForLoanAndLeaseLosses_55f73fc8-201b-41e9-b649-8330ee16e3f4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForLoanLossesExpensed_af04ea8d-cf43-4b7c-80e0-17cd1807f35b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProvisionForLoanLossesExpensed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_6f4342f5-4359-418f-8fa1-3c43b3d2942b" xlink:to="loc_us-gaap_ProvisionForLoanLossesExpensed_af04ea8d-cf43-4b7c-80e0-17cd1807f35b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_4533a2d2-aa8d-4c83-bbc5-549a13daaf10" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLosses"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/LoansandAllowanceforCreditLossesDetailsonAllowanceforLoanLossesandRecordedInvestmentbyLoanClassificationandImpairmentEvaluationMethodDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#LoansandAllowanceforCreditLossesDetailsonAllowanceforLoanLossesandRecordedInvestmentbyLoanClassificationandImpairmentEvaluationMethodDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/LoansandAllowanceforCreditLossesDetailsonAllowanceforLoanLossesandRecordedInvestmentbyLoanClassificationandImpairmentEvaluationMethodDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_ff9b73d4-33f7-45be-8e3b-b0d431786dc4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_d7de6441-6c85-4e63-96de-c77a788c9bdf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_ff9b73d4-33f7-45be-8e3b-b0d431786dc4" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_d7de6441-6c85-4e63-96de-c77a788c9bdf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_2a3f4b5d-1819-44be-b813-592c1ccf8b4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_d7de6441-6c85-4e63-96de-c77a788c9bdf" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_2a3f4b5d-1819-44be-b813-592c1ccf8b4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_2a3f4b5d-1819-44be-b813-592c1ccf8b4f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_2a3f4b5d-1819-44be-b813-592c1ccf8b4f" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_2a3f4b5d-1819-44be-b813-592c1ccf8b4f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_ddcf7a78-d1f5-4b0e-aca6-9ffa2bd3ef07" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_2a3f4b5d-1819-44be-b813-592c1ccf8b4f" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_ddcf7a78-d1f5-4b0e-aca6-9ffa2bd3ef07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CommercialRealEstateOwnerOccupiedMember_b2b7ead8-8158-4723-8523-38f72240f605" xlink:href="pnfp-20250930.xsd#pnfp_CommercialRealEstateOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_ddcf7a78-d1f5-4b0e-aca6-9ffa2bd3ef07" xlink:to="loc_pnfp_CommercialRealEstateOwnerOccupiedMember_b2b7ead8-8158-4723-8523-38f72240f605" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CommercialRealEstateNonOwnerOccupiedMember_9097a064-0f00-401c-acb7-e9c01ba92fef" xlink:href="pnfp-20250930.xsd#pnfp_CommercialRealEstateNonOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_ddcf7a78-d1f5-4b0e-aca6-9ffa2bd3ef07" xlink:to="loc_pnfp_CommercialRealEstateNonOwnerOccupiedMember_9097a064-0f00-401c-acb7-e9c01ba92fef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialRealEstateMember_5f944517-9a5c-4539-ab5e-691f21611c7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_ddcf7a78-d1f5-4b0e-aca6-9ffa2bd3ef07" xlink:to="loc_us-gaap_ResidentialRealEstateMember_5f944517-9a5c-4539-ab5e-691f21611c7c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember_d0837f02-addf-4a4c-bf0e-89f6b7ab838c" xlink:href="pnfp-20250930.xsd#pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_ddcf7a78-d1f5-4b0e-aca6-9ffa2bd3ef07" xlink:to="loc_pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember_d0837f02-addf-4a4c-bf0e-89f6b7ab838c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CommercialandIndustrialPortfolioSegmentMember_b5b61dbd-b36b-4975-a366-0c6044368b72" xlink:href="pnfp-20250930.xsd#pnfp_CommercialandIndustrialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_ddcf7a78-d1f5-4b0e-aca6-9ffa2bd3ef07" xlink:to="loc_pnfp_CommercialandIndustrialPortfolioSegmentMember_b5b61dbd-b36b-4975-a366-0c6044368b72" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_3835dee6-ed21-4680-9c8e-49eaa5669bbc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_ddcf7a78-d1f5-4b0e-aca6-9ffa2bd3ef07" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_3835dee6-ed21-4680-9c8e-49eaa5669bbc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditLossStatusAxis_784bf15a-c1a7-4d2c-8794-2529c0802eb9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditLossStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_d7de6441-6c85-4e63-96de-c77a788c9bdf" xlink:to="loc_us-gaap_CreditLossStatusAxis_784bf15a-c1a7-4d2c-8794-2529c0802eb9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditLossStatusDomain_784bf15a-c1a7-4d2c-8794-2529c0802eb9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditLossStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditLossStatusAxis_784bf15a-c1a7-4d2c-8794-2529c0802eb9" xlink:to="loc_us-gaap_CreditLossStatusDomain_784bf15a-c1a7-4d2c-8794-2529c0802eb9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditLossStatusDomain_db0fccc8-d1da-47b7-a5cb-32b7fc99a997" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditLossStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditLossStatusAxis_784bf15a-c1a7-4d2c-8794-2529c0802eb9" xlink:to="loc_us-gaap_CreditLossStatusDomain_db0fccc8-d1da-47b7-a5cb-32b7fc99a997" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralAxis_b6a8bde7-8c59-4ba6-a7b8-add5bab796cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_d7de6441-6c85-4e63-96de-c77a788c9bdf" xlink:to="loc_us-gaap_CollateralAxis_b6a8bde7-8c59-4ba6-a7b8-add5bab796cc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralDomain_b6a8bde7-8c59-4ba6-a7b8-add5bab796cc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CollateralAxis_b6a8bde7-8c59-4ba6-a7b8-add5bab796cc" xlink:to="loc_us-gaap_CollateralDomain_b6a8bde7-8c59-4ba6-a7b8-add5bab796cc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralDomain_df685300-3fd8-42a6-ab5e-4eb7808eab86" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CollateralAxis_b6a8bde7-8c59-4ba6-a7b8-add5bab796cc" xlink:to="loc_us-gaap_CollateralDomain_df685300-3fd8-42a6-ab5e-4eb7808eab86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstateMember_ee8d4fdd-5ee7-4263-a50e-2ed8f74c62bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CollateralDomain_df685300-3fd8-42a6-ab5e-4eb7808eab86" xlink:to="loc_us-gaap_RealEstateMember_ee8d4fdd-5ee7-4263-a50e-2ed8f74c62bf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_BusinessAssetsMember_cdff191e-7884-44bf-bf7f-aa61053b3e6d" xlink:href="pnfp-20250930.xsd#pnfp_BusinessAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CollateralDomain_df685300-3fd8-42a6-ab5e-4eb7808eab86" xlink:to="loc_pnfp_BusinessAssetsMember_cdff191e-7884-44bf-bf7f-aa61053b3e6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_OtherMember_106d5f15-39eb-4c7e-98d6-fcd3845c6490" xlink:href="pnfp-20250930.xsd#pnfp_OtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CollateralDomain_df685300-3fd8-42a6-ab5e-4eb7808eab86" xlink:to="loc_pnfp_OtherMember_106d5f15-39eb-4c7e-98d6-fcd3845c6490" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment_7cab1d60-47fd-476f-9d94-d355e8ea069c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_ff9b73d4-33f7-45be-8e3b-b0d431786dc4" xlink:to="loc_us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment_7cab1d60-47fd-476f-9d94-d355e8ea069c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/LoansandAllowanceforCreditLossesNonaccrualandPastDueGreaterthan90DaysDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#LoansandAllowanceforCreditLossesNonaccrualandPastDueGreaterthan90DaysDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/LoansandAllowanceforCreditLossesNonaccrualandPastDueGreaterthan90DaysDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableNonaccrualStatusLineItems_3ba75689-de4e-4a57-8265-212088de52ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableNonaccrualStatusLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableNonaccrualTable_9e6666a9-87a2-4cbb-8a51-b71b73c266c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableNonaccrualTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableNonaccrualStatusLineItems_3ba75689-de4e-4a57-8265-212088de52ee" xlink:to="loc_us-gaap_FinancingReceivableNonaccrualTable_9e6666a9-87a2-4cbb-8a51-b71b73c266c9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_ea53050e-d34c-4244-ae26-67c5632fd09d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FinancingReceivableNonaccrualTable_9e6666a9-87a2-4cbb-8a51-b71b73c266c9" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_ea53050e-d34c-4244-ae26-67c5632fd09d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_ea53050e-d34c-4244-ae26-67c5632fd09d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_ea53050e-d34c-4244-ae26-67c5632fd09d" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_ea53050e-d34c-4244-ae26-67c5632fd09d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_c996c67c-6e94-4fb9-b5d4-d0546a6eec3d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_ea53050e-d34c-4244-ae26-67c5632fd09d" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_c996c67c-6e94-4fb9-b5d4-d0546a6eec3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CommercialRealEstateOwnerOccupiedMember_9575aece-f6b2-40e8-a70b-07c6e1714719" xlink:href="pnfp-20250930.xsd#pnfp_CommercialRealEstateOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_c996c67c-6e94-4fb9-b5d4-d0546a6eec3d" xlink:to="loc_pnfp_CommercialRealEstateOwnerOccupiedMember_9575aece-f6b2-40e8-a70b-07c6e1714719" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CommercialRealEstateNonOwnerOccupiedMember_3d283efc-e969-4681-ab2a-8c959dbf434c" xlink:href="pnfp-20250930.xsd#pnfp_CommercialRealEstateNonOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_c996c67c-6e94-4fb9-b5d4-d0546a6eec3d" xlink:to="loc_pnfp_CommercialRealEstateNonOwnerOccupiedMember_3d283efc-e969-4681-ab2a-8c959dbf434c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialRealEstateMember_5d075cbc-539b-4655-a064-9e2f7aafa021" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_c996c67c-6e94-4fb9-b5d4-d0546a6eec3d" xlink:to="loc_us-gaap_ResidentialRealEstateMember_5d075cbc-539b-4655-a064-9e2f7aafa021" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember_0cbbe004-5226-457c-bcfc-8427acd9072b" xlink:href="pnfp-20250930.xsd#pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_c996c67c-6e94-4fb9-b5d4-d0546a6eec3d" xlink:to="loc_pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember_0cbbe004-5226-457c-bcfc-8427acd9072b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CommercialandIndustrialPortfolioSegmentMember_703e69dc-6aea-4b03-9197-0180368465c0" xlink:href="pnfp-20250930.xsd#pnfp_CommercialandIndustrialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_c996c67c-6e94-4fb9-b5d4-d0546a6eec3d" xlink:to="loc_pnfp_CommercialandIndustrialPortfolioSegmentMember_703e69dc-6aea-4b03-9197-0180368465c0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_9a67a3ec-b124-417c-984d-bcf8a5dd619f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_c996c67c-6e94-4fb9-b5d4-d0546a6eec3d" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_9a67a3ec-b124-417c-984d-bcf8a5dd619f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CommercialAndIndustrialMember_b191f1cf-c45d-44b0-b065-dacb5b33a768" xlink:href="pnfp-20250930.xsd#pnfp_CommercialAndIndustrialMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_c996c67c-6e94-4fb9-b5d4-d0546a6eec3d" xlink:to="loc_pnfp_CommercialAndIndustrialMember_b191f1cf-c45d-44b0-b065-dacb5b33a768" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest_6da06739-8d3a-4d87-93ae-6b9629ce881c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableNonaccrualStatusLineItems_3ba75689-de4e-4a57-8265-212088de52ee" xlink:to="loc_us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest_6da06739-8d3a-4d87-93ae-6b9629ce881c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableNonaccrualNoAllowance_0972c7b4-d120-451c-8f74-0902146aa009" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableNonaccrualNoAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableNonaccrualStatusLineItems_3ba75689-de4e-4a57-8265-212088de52ee" xlink:to="loc_us-gaap_FinancingReceivableNonaccrualNoAllowance_0972c7b4-d120-451c-8f74-0902146aa009" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing_35412915-91ee-451e-878b-c3cae39fcb74" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableNonaccrualStatusLineItems_3ba75689-de4e-4a57-8265-212088de52ee" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing_35412915-91ee-451e-878b-c3cae39fcb74" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus_31b9b999-a250-4927-8f90-3f1625db6b03" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableNonaccrualStatusLineItems_3ba75689-de4e-4a57-8265-212088de52ee" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus_31b9b999-a250-4927-8f90-3f1625db6b03" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/LoansandAllowanceforCreditLossesRecordedInvestmentPrincipalBalanceandRelatedAllowanceDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#LoansandAllowanceforCreditLossesRecordedInvestmentPrincipalBalanceandRelatedAllowanceDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/LoansandAllowanceforCreditLossesRecordedInvestmentPrincipalBalanceandRelatedAllowanceDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableImpairedLineItems_a79026ba-cdbd-4155-8a23-5fe579ce84ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableImpairedLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfImpairedFinancingReceivableTable_f57e8940-57f1-4797-902a-b46215bc868b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfImpairedFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableImpairedLineItems_a79026ba-cdbd-4155-8a23-5fe579ce84ab" xlink:to="loc_us-gaap_ScheduleOfImpairedFinancingReceivableTable_f57e8940-57f1-4797-902a-b46215bc868b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_4b1c69e3-b837-4b25-b665-84044290ef32" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfImpairedFinancingReceivableTable_f57e8940-57f1-4797-902a-b46215bc868b" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_4b1c69e3-b837-4b25-b665-84044290ef32" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_4b1c69e3-b837-4b25-b665-84044290ef32_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_4b1c69e3-b837-4b25-b665-84044290ef32" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_4b1c69e3-b837-4b25-b665-84044290ef32_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_ab6b6948-10e9-48ff-8b68-debb8a45bf2c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_4b1c69e3-b837-4b25-b665-84044290ef32" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_ab6b6948-10e9-48ff-8b68-debb8a45bf2c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialRealEstateMember_c8fa60d6-6055-4e71-aed6-aed6b17be2fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_ab6b6948-10e9-48ff-8b68-debb8a45bf2c" xlink:to="loc_us-gaap_ResidentialRealEstateMember_c8fa60d6-6055-4e71-aed6-aed6b17be2fd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember_b5ff0ccc-ddd1-447b-9a85-b81c017600f1" xlink:href="pnfp-20250930.xsd#pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_ab6b6948-10e9-48ff-8b68-debb8a45bf2c" xlink:to="loc_pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember_b5ff0ccc-ddd1-447b-9a85-b81c017600f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CommercialandIndustrialPortfolioSegmentMember_e2dcec8e-0d3b-4034-96f2-0debf40f7d4b" xlink:href="pnfp-20250930.xsd#pnfp_CommercialandIndustrialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_ab6b6948-10e9-48ff-8b68-debb8a45bf2c" xlink:to="loc_pnfp_CommercialandIndustrialPortfolioSegmentMember_e2dcec8e-0d3b-4034-96f2-0debf40f7d4b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_650d939d-9962-4860-8d95-b0be5d92a24f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_ab6b6948-10e9-48ff-8b68-debb8a45bf2c" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_650d939d-9962-4860-8d95-b0be5d92a24f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_FinancingReceivableNonaccrualInterestIncomeCashBasisMethod_619dfb04-ef2a-437f-84d7-c691eeeb23fe" xlink:href="pnfp-20250930.xsd#pnfp_FinancingReceivableNonaccrualInterestIncomeCashBasisMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableImpairedLineItems_a79026ba-cdbd-4155-8a23-5fe579ce84ab" xlink:to="loc_pnfp_FinancingReceivableNonaccrualInterestIncomeCashBasisMethod_619dfb04-ef2a-437f-84d7-c691eeeb23fe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_FinancingReceivableNonaccrualInterestIncomeLost_37160018-74d2-4195-8bbd-598ece4c993e" xlink:href="pnfp-20250930.xsd#pnfp_FinancingReceivableNonaccrualInterestIncomeLost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableImpairedLineItems_a79026ba-cdbd-4155-8a23-5fe579ce84ab" xlink:to="loc_pnfp_FinancingReceivableNonaccrualInterestIncomeLost_37160018-74d2-4195-8bbd-598ece4c993e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_FinancingReceivableImpairedLoansCurrentAndPerforming_3f055273-54bb-4aaf-97c8-83ccec8e82a1" xlink:href="pnfp-20250930.xsd#pnfp_FinancingReceivableImpairedLoansCurrentAndPerforming"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableImpairedLineItems_a79026ba-cdbd-4155-8a23-5fe579ce84ab" xlink:to="loc_pnfp_FinancingReceivableImpairedLoansCurrentAndPerforming_3f055273-54bb-4aaf-97c8-83ccec8e82a1" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/LoansandAllowanceforCreditLossesModificationsDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#LoansandAllowanceforCreditLossesModificationsDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/LoansandAllowanceforCreditLossesModificationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_ScheduleOfFinancingReceivableModificationsTableLineItems_ca0e31f1-9fae-4a00-9024-1a3354dc5a22" xlink:href="pnfp-20250930.xsd#pnfp_ScheduleOfFinancingReceivableModificationsTableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_ScheduleOfFinancingReceivableModificationsTableTable_c0727745-1820-4140-8aa1-32edb03c9653" xlink:href="pnfp-20250930.xsd#pnfp_ScheduleOfFinancingReceivableModificationsTableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_pnfp_ScheduleOfFinancingReceivableModificationsTableLineItems_ca0e31f1-9fae-4a00-9024-1a3354dc5a22" xlink:to="loc_pnfp_ScheduleOfFinancingReceivableModificationsTableTable_c0727745-1820-4140-8aa1-32edb03c9653" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_921b4c8a-f042-46fe-8531-1cb6351fc570" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_pnfp_ScheduleOfFinancingReceivableModificationsTableTable_c0727745-1820-4140-8aa1-32edb03c9653" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_921b4c8a-f042-46fe-8531-1cb6351fc570" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_921b4c8a-f042-46fe-8531-1cb6351fc570_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_921b4c8a-f042-46fe-8531-1cb6351fc570" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_921b4c8a-f042-46fe-8531-1cb6351fc570_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_b86f7e5e-5b85-4bc4-9ac3-f58308d76e10" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_921b4c8a-f042-46fe-8531-1cb6351fc570" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_b86f7e5e-5b85-4bc4-9ac3-f58308d76e10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CommercialRealEstateOwnerOccupiedMember_518ba3b3-1514-4aad-a6aa-8ea772dbf6be" xlink:href="pnfp-20250930.xsd#pnfp_CommercialRealEstateOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_b86f7e5e-5b85-4bc4-9ac3-f58308d76e10" xlink:to="loc_pnfp_CommercialRealEstateOwnerOccupiedMember_518ba3b3-1514-4aad-a6aa-8ea772dbf6be" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CommercialRealEstateNonOwnerOccupiedMember_742bdd12-dc7e-4fb4-9dc0-d76d50a92e44" xlink:href="pnfp-20250930.xsd#pnfp_CommercialRealEstateNonOwnerOccupiedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_b86f7e5e-5b85-4bc4-9ac3-f58308d76e10" xlink:to="loc_pnfp_CommercialRealEstateNonOwnerOccupiedMember_742bdd12-dc7e-4fb4-9dc0-d76d50a92e44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialRealEstateMember_9430bd57-854e-4bad-82ae-a050949a5ea3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_b86f7e5e-5b85-4bc4-9ac3-f58308d76e10" xlink:to="loc_us-gaap_ResidentialRealEstateMember_9430bd57-854e-4bad-82ae-a050949a5ea3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember_5139aae0-810e-4ec8-a610-93b86ea20762" xlink:href="pnfp-20250930.xsd#pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_b86f7e5e-5b85-4bc4-9ac3-f58308d76e10" xlink:to="loc_pnfp_ConstructionandLandDevelopmentPortfolioSegmentMember_5139aae0-810e-4ec8-a610-93b86ea20762" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CommercialandIndustrialPortfolioSegmentMember_5526f845-1d2f-4661-a3ab-5fee4f5b31d1" xlink:href="pnfp-20250930.xsd#pnfp_CommercialandIndustrialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_b86f7e5e-5b85-4bc4-9ac3-f58308d76e10" xlink:to="loc_pnfp_CommercialandIndustrialPortfolioSegmentMember_5526f845-1d2f-4661-a3ab-5fee4f5b31d1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_b46efc78-1366-42b0-afd9-7798c9dd8091" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_b86f7e5e-5b85-4bc4-9ac3-f58308d76e10" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_b46efc78-1366-42b0-afd9-7798c9dd8091" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_NonowneroccupiedcommercialrealestateandmultifamilyloansMember_285986e9-c3bf-4a35-8b96-d12848e56338" xlink:href="pnfp-20250930.xsd#pnfp_NonowneroccupiedcommercialrealestateandmultifamilyloansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_b86f7e5e-5b85-4bc4-9ac3-f58308d76e10" xlink:to="loc_pnfp_NonowneroccupiedcommercialrealestateandmultifamilyloansMember_285986e9-c3bf-4a35-8b96-d12848e56338" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentDeferralMember_88e3ccd2-6e7f-4562-8de5-9f8007cc31a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentDeferralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_b86f7e5e-5b85-4bc4-9ac3-f58308d76e10" xlink:to="loc_us-gaap_PaymentDeferralMember_88e3ccd2-6e7f-4562-8de5-9f8007cc31a4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CommercialAndIndustrialMember_bfa59122-f3ef-416d-a338-2d762c90465e" xlink:href="pnfp-20250930.xsd#pnfp_CommercialAndIndustrialMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_b86f7e5e-5b85-4bc4-9ac3-f58308d76e10" xlink:to="loc_pnfp_CommercialAndIndustrialMember_bfa59122-f3ef-416d-a338-2d762c90465e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanRestructuringModificationAxis_97940cf8-8523-47b8-a9e5-36983a0a3100" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoanRestructuringModificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_pnfp_ScheduleOfFinancingReceivableModificationsTableTable_c0727745-1820-4140-8aa1-32edb03c9653" xlink:to="loc_us-gaap_LoanRestructuringModificationAxis_97940cf8-8523-47b8-a9e5-36983a0a3100" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanRestructuringModificationDomain_97940cf8-8523-47b8-a9e5-36983a0a3100_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoanRestructuringModificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LoanRestructuringModificationAxis_97940cf8-8523-47b8-a9e5-36983a0a3100" xlink:to="loc_us-gaap_LoanRestructuringModificationDomain_97940cf8-8523-47b8-a9e5-36983a0a3100_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanRestructuringModificationDomain_80ea9f24-cfd8-4135-88c0-c920748e1213" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoanRestructuringModificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LoanRestructuringModificationAxis_97940cf8-8523-47b8-a9e5-36983a0a3100" xlink:to="loc_us-gaap_LoanRestructuringModificationDomain_80ea9f24-cfd8-4135-88c0-c920748e1213" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentDeferralMember_e5158b44-6cf0-4728-b0f8-af845e0bbe9a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentDeferralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationDomain_80ea9f24-cfd8-4135-88c0-c920748e1213" xlink:to="loc_us-gaap_PaymentDeferralMember_e5158b44-6cf0-4728-b0f8-af845e0bbe9a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ExtendedMaturityMember_57286e97-df9e-4145-b599-66caf88ba64d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ExtendedMaturityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationDomain_80ea9f24-cfd8-4135-88c0-c920748e1213" xlink:to="loc_us-gaap_ExtendedMaturityMember_57286e97-df9e-4145-b599-66caf88ba64d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CombinationPaymentDeferralExtendedMaturityAndContractualInterestRateReductionMember_107be7cc-29bf-4fab-adf5-92da85327a59" xlink:href="pnfp-20250930.xsd#pnfp_CombinationPaymentDeferralExtendedMaturityAndContractualInterestRateReductionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationDomain_80ea9f24-cfd8-4135-88c0-c920748e1213" xlink:to="loc_pnfp_CombinationPaymentDeferralExtendedMaturityAndContractualInterestRateReductionMember_107be7cc-29bf-4fab-adf5-92da85327a59" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CombinationExtendedMaturityContractualInterestRateReductionMember_cc452a57-1ba8-4101-96dc-80c195f437e4" xlink:href="pnfp-20250930.xsd#pnfp_CombinationExtendedMaturityContractualInterestRateReductionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationDomain_80ea9f24-cfd8-4135-88c0-c920748e1213" xlink:to="loc_pnfp_CombinationExtendedMaturityContractualInterestRateReductionMember_cc452a57-1ba8-4101-96dc-80c195f437e4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CombinationPaymentDeferralExtendedMaturityMember_b02bb133-5120-463d-9e1a-4131d47eb8b7" xlink:href="pnfp-20250930.xsd#pnfp_CombinationPaymentDeferralExtendedMaturityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationDomain_80ea9f24-cfd8-4135-88c0-c920748e1213" xlink:to="loc_pnfp_CombinationPaymentDeferralExtendedMaturityMember_b02bb133-5120-463d-9e1a-4131d47eb8b7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_b8b9e058-c623-4148-9a66-80769275fe2c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_pnfp_ScheduleOfFinancingReceivableModificationsTableTable_c0727745-1820-4140-8aa1-32edb03c9653" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_b8b9e058-c623-4148-9a66-80769275fe2c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_b8b9e058-c623-4148-9a66-80769275fe2c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_b8b9e058-c623-4148-9a66-80769275fe2c" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_b8b9e058-c623-4148-9a66-80769275fe2c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_74f9bed7-b0da-4a82-b0f2-7e4257d50fc6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_b8b9e058-c623-4148-9a66-80769275fe2c" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_74f9bed7-b0da-4a82-b0f2-7e4257d50fc6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_70072e09-2f8c-401d-8bb4-91f4b052786d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivables30To59DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_74f9bed7-b0da-4a82-b0f2-7e4257d50fc6" xlink:to="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_70072e09-2f8c-401d-8bb4-91f4b052786d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_b692b6f5-1be2-470b-bb35-9300253f8128" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivables60To89DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_74f9bed7-b0da-4a82-b0f2-7e4257d50fc6" xlink:to="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_b692b6f5-1be2-470b-bb35-9300253f8128" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_348cffb0-4a37-4707-a97b-3f425a99a73d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_74f9bed7-b0da-4a82-b0f2-7e4257d50fc6" xlink:to="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_348cffb0-4a37-4707-a97b-3f425a99a73d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetNotPastDueMember_8dc41d60-73cc-44d4-9ff3-d41c168d6b9a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialAssetNotPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_74f9bed7-b0da-4a82-b0f2-7e4257d50fc6" xlink:to="loc_us-gaap_FinancialAssetNotPastDueMember_8dc41d60-73cc-44d4-9ff3-d41c168d6b9a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModificationToTotalFinancingReceivablesPercent_1209754f-801a-4087-956a-b85f756975cb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableModificationToTotalFinancingReceivablesPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_ScheduleOfFinancingReceivableModificationsTableLineItems_ca0e31f1-9fae-4a00-9024-1a3354dc5a22" xlink:to="loc_us-gaap_FinancingReceivableModificationToTotalFinancingReceivablesPercent_1209754f-801a-4087-956a-b85f756975cb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_FinancingReceivableModificationPastDue_7656c0e2-aaff-42bd-b750-da1c863eb9c3" xlink:href="pnfp-20250930.xsd#pnfp_FinancingReceivableModificationPastDue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_ScheduleOfFinancingReceivableModificationsTableLineItems_ca0e31f1-9fae-4a00-9024-1a3354dc5a22" xlink:to="loc_pnfp_FinancingReceivableModificationPastDue_7656c0e2-aaff-42bd-b750-da1c863eb9c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1_df553ba1-532c-4b4e-9c49-8d5c4eae335f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_ScheduleOfFinancingReceivableModificationsTableLineItems_ca0e31f1-9fae-4a00-9024-1a3354dc5a22" xlink:to="loc_us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1_df553ba1-532c-4b4e-9c49-8d5c4eae335f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2_0ed4700a-f5d9-489c-9961-fa5c4f6cfc5e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_ScheduleOfFinancingReceivableModificationsTableLineItems_ca0e31f1-9fae-4a00-9024-1a3354dc5a22" xlink:to="loc_us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2_0ed4700a-f5d9-489c-9961-fa5c4f6cfc5e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification_420d70a3-ab05-48d7-956e-d3df5b19d374" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_ScheduleOfFinancingReceivableModificationsTableLineItems_ca0e31f1-9fae-4a00-9024-1a3354dc5a22" xlink:to="loc_us-gaap_FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification_420d70a3-ab05-48d7-956e-d3df5b19d374" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModifiedWeightedAverageInterestRateDecreaseFromModification_0cdb1e31-2aac-42c2-9269-2740f62594a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableModifiedWeightedAverageInterestRateDecreaseFromModification"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_ScheduleOfFinancingReceivableModificationsTableLineItems_ca0e31f1-9fae-4a00-9024-1a3354dc5a22" xlink:to="loc_us-gaap_FinancingReceivableModifiedWeightedAverageInterestRateDecreaseFromModification_0cdb1e31-2aac-42c2-9269-2740f62594a5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_FinancingReceivableModifiedWriteoff_f401949d-e64e-4311-ac1d-24c3d695040b" xlink:href="pnfp-20250930.xsd#pnfp_FinancingReceivableModifiedWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_ScheduleOfFinancingReceivableModificationsTableLineItems_ca0e31f1-9fae-4a00-9024-1a3354dc5a22" xlink:to="loc_pnfp_FinancingReceivableModifiedWriteoff_f401949d-e64e-4311-ac1d-24c3d695040b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModifiedPast12Months_d90fdf41-4719-4fa3-ae93-77598b685f0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableModifiedPast12Months"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_ScheduleOfFinancingReceivableModificationsTableLineItems_ca0e31f1-9fae-4a00-9024-1a3354dc5a22" xlink:to="loc_us-gaap_FinancingReceivableModifiedPast12Months_d90fdf41-4719-4fa3-ae93-77598b685f0a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModifiedPaymentDeferralPeriod_60281783-6e7b-4468-910f-d43e6dc084dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableModifiedPaymentDeferralPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_ScheduleOfFinancingReceivableModificationsTableLineItems_ca0e31f1-9fae-4a00-9024-1a3354dc5a22" xlink:to="loc_us-gaap_FinancingReceivableModifiedPaymentDeferralPeriod_60281783-6e7b-4468-910f-d43e6dc084dc" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/LoansandAllowanceforCreditLossesIndustryClassificationSystemDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#LoansandAllowanceforCreditLossesIndustryClassificationSystemDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/LoansandAllowanceforCreditLossesIndustryClassificationSystemDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_168846df-8443-4187-a199-2c77ac7e456a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_1541a1f3-c01e-4e52-86b9-3036960c4076" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_168846df-8443-4187-a199-2c77ac7e456a" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_1541a1f3-c01e-4e52-86b9-3036960c4076" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis_377833e9-97fe-4b2d-8f65-4cb90851a587" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_1541a1f3-c01e-4e52-86b9-3036960c4076" xlink:to="loc_us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis_377833e9-97fe-4b2d-8f65-4cb90851a587" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndustryOfCounterpartyDomain_377833e9-97fe-4b2d-8f65-4cb90851a587_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndustryOfCounterpartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis_377833e9-97fe-4b2d-8f65-4cb90851a587" xlink:to="loc_us-gaap_IndustryOfCounterpartyDomain_377833e9-97fe-4b2d-8f65-4cb90851a587_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndustryOfCounterpartyDomain_3df082ae-0e0d-444b-a266-cafb00434b3e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndustryOfCounterpartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis_377833e9-97fe-4b2d-8f65-4cb90851a587" xlink:to="loc_us-gaap_IndustryOfCounterpartyDomain_3df082ae-0e0d-444b-a266-cafb00434b3e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_LessorsOfNonresidentialBuildingsMember_62e804bc-acf2-4a1c-890a-ca35db9089eb" xlink:href="pnfp-20250930.xsd#pnfp_LessorsOfNonresidentialBuildingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndustryOfCounterpartyDomain_3df082ae-0e0d-444b-a266-cafb00434b3e" xlink:to="loc_pnfp_LessorsOfNonresidentialBuildingsMember_62e804bc-acf2-4a1c-890a-ca35db9089eb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_LessorsOfResidentialBuildingsMember_ba3d18e6-9725-4e26-ad34-ce977de4a5d0" xlink:href="pnfp-20250930.xsd#pnfp_LessorsOfResidentialBuildingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndustryOfCounterpartyDomain_3df082ae-0e0d-444b-a266-cafb00434b3e" xlink:to="loc_pnfp_LessorsOfResidentialBuildingsMember_ba3d18e6-9725-4e26-ad34-ce977de4a5d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_naics_ZZ236117_0faac385-6c32-4706-9bd9-c18aff3de1f1" xlink:href="https://xbrl.sec.gov/naics/2025/naics-2025.xsd#naics_ZZ236117"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndustryOfCounterpartyDomain_3df082ae-0e0d-444b-a266-cafb00434b3e" xlink:to="loc_naics_ZZ236117_0faac385-6c32-4706-9bd9-c18aff3de1f1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_naics_ZZ512230_56a1b16c-ba11-4668-b3e4-e6c715901b16" xlink:href="https://xbrl.sec.gov/naics/2025/naics-2025.xsd#naics_ZZ512230"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndustryOfCounterpartyDomain_3df082ae-0e0d-444b-a266-cafb00434b3e" xlink:to="loc_naics_ZZ512230_56a1b16c-ba11-4668-b3e4-e6c715901b16" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_FinancingReceivablesPrincipalBalance_78e24fa9-2314-485f-8f8d-444609f36cbd" xlink:href="pnfp-20250930.xsd#pnfp_FinancingReceivablesPrincipalBalance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_168846df-8443-4187-a199-2c77ac7e456a" xlink:to="loc_pnfp_FinancingReceivablesPrincipalBalance_78e24fa9-2314-485f-8f8d-444609f36cbd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_FinancingReceivablesUnfundedCommitment_2b3a12c3-d7cd-4aeb-8014-93590d0cf451" xlink:href="pnfp-20250930.xsd#pnfp_FinancingReceivablesUnfundedCommitment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_168846df-8443-4187-a199-2c77ac7e456a" xlink:to="loc_pnfp_FinancingReceivablesUnfundedCommitment_2b3a12c3-d7cd-4aeb-8014-93590d0cf451" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_FinancingReceivablesExposure_d6eb425f-47da-4126-95c9-aa32c095a6fc" xlink:href="pnfp-20250930.xsd#pnfp_FinancingReceivablesExposure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_168846df-8443-4187-a199-2c77ac7e456a" xlink:to="loc_pnfp_FinancingReceivablesExposure_d6eb425f-47da-4126-95c9-aa32c095a6fc" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/MortgageServicingRightsDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#MortgageServicingRightsDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/MortgageServicingRightsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetsAtFairValueLineItems_a4113fc7-a29f-4e5d-a37f-383aa3073698" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ServicingAssetsAtFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetsAtFairValueTable_16951d9b-5fb6-48de-80a6-deae7ae40cc4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ServicingAssetsAtFairValueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ServicingAssetsAtFairValueLineItems_a4113fc7-a29f-4e5d-a37f-383aa3073698" xlink:to="loc_us-gaap_ServicingAssetsAtFairValueTable_16951d9b-5fb6-48de-80a6-deae7ae40cc4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_0119586e-112f-4a42-8fb7-a8b6a4f2c5dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ServicingAssetsAtFairValueTable_16951d9b-5fb6-48de-80a6-deae7ae40cc4" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_0119586e-112f-4a42-8fb7-a8b6a4f2c5dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_0119586e-112f-4a42-8fb7-a8b6a4f2c5dc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_0119586e-112f-4a42-8fb7-a8b6a4f2c5dc" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_0119586e-112f-4a42-8fb7-a8b6a4f2c5dc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_c328326a-1d15-4dff-ba83-0fb391dd2852" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_0119586e-112f-4a42-8fb7-a8b6a4f2c5dc" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_c328326a-1d15-4dff-ba83-0fb391dd2852" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditDefaultSwapMember_d1eba618-3120-45fc-b4c5-becf937e36b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditDefaultSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_c328326a-1d15-4dff-ba83-0fb391dd2852" xlink:to="loc_us-gaap_CreditDefaultSwapMember_d1eba618-3120-45fc-b4c5-becf937e36b6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_20b35544-98b7-4e2e-8ccd-4c2efa8d85bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ServicingAssetsAtFairValueTable_16951d9b-5fb6-48de-80a6-deae7ae40cc4" xlink:to="loc_us-gaap_HedgingDesignationAxis_20b35544-98b7-4e2e-8ccd-4c2efa8d85bc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_20b35544-98b7-4e2e-8ccd-4c2efa8d85bc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_20b35544-98b7-4e2e-8ccd-4c2efa8d85bc" xlink:to="loc_us-gaap_HedgingDesignationDomain_20b35544-98b7-4e2e-8ccd-4c2efa8d85bc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_5a379d41-81b5-4650-8852-5813e31f573a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_20b35544-98b7-4e2e-8ccd-4c2efa8d85bc" xlink:to="loc_us-gaap_HedgingDesignationDomain_5a379d41-81b5-4650-8852-5813e31f573a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_b70f285b-5640-4ba8-988a-a80c01a82371" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_5a379d41-81b5-4650-8852-5813e31f573a" xlink:to="loc_us-gaap_NondesignatedMember_b70f285b-5640-4ba8-988a-a80c01a82371" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetAtFairValueAmount_b8e87a47-74ea-469c-ae6b-9be10982d612" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ServicingAssetAtFairValueAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetsAtFairValueLineItems_a4113fc7-a29f-4e5d-a37f-383aa3073698" xlink:to="loc_us-gaap_ServicingAssetAtFairValueAmount_b8e87a47-74ea-469c-ae6b-9be10982d612" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAsset_78def85c-6586-437d-b347-14222be08f75" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ServicingAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetsAtFairValueLineItems_a4113fc7-a29f-4e5d-a37f-383aa3073698" xlink:to="loc_us-gaap_ServicingAsset_78def85c-6586-437d-b347-14222be08f75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetAtFairValueAdditions_51ca3d2f-f719-4aac-813b-b8d1bab933ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ServicingAssetAtFairValueAdditions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetsAtFairValueLineItems_a4113fc7-a29f-4e5d-a37f-383aa3073698" xlink:to="loc_us-gaap_ServicingAssetAtFairValueAdditions_51ca3d2f-f719-4aac-813b-b8d1bab933ae" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetAtFairValuePeriodIncreaseDecrease_a95e6c0c-09d3-4ec6-8a15-e28e8fa54d09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ServicingAssetAtFairValuePeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetsAtFairValueLineItems_a4113fc7-a29f-4e5d-a37f-383aa3073698" xlink:to="loc_us-gaap_ServicingAssetAtFairValuePeriodIncreaseDecrease_a95e6c0c-09d3-4ec6-8a15-e28e8fa54d09" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions_3ad223e7-d5d7-4ee6-8fbe-3314b23b2cbe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetsAtFairValueLineItems_a4113fc7-a29f-4e5d-a37f-383aa3073698" xlink:to="loc_us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions_3ad223e7-d5d7-4ee6-8fbe-3314b23b2cbe" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/CommitmentsandContingentLiabilitiesDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#CommitmentsandContingentLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/CommitmentsandContingentLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_c69b8d59-e895-4849-a5b1-75e5fb37d0a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_8d401ac5-6256-4b4d-9921-ad5e9aec6399" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_c69b8d59-e895-4849-a5b1-75e5fb37d0a9" xlink:to="loc_us-gaap_LossContingenciesTable_8d401ac5-6256-4b4d-9921-ad5e9aec6399" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_06a58ed5-28d7-444d-8ba2-4fc833ddfe7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_8d401ac5-6256-4b4d-9921-ad5e9aec6399" xlink:to="loc_us-gaap_FinancialInstrumentAxis_06a58ed5-28d7-444d-8ba2-4fc833ddfe7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_06a58ed5-28d7-444d-8ba2-4fc833ddfe7c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_06a58ed5-28d7-444d-8ba2-4fc833ddfe7c" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_06a58ed5-28d7-444d-8ba2-4fc833ddfe7c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_92585609-aea1-45db-9a0b-ea0b7a9d113c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_06a58ed5-28d7-444d-8ba2-4fc833ddfe7c" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_92585609-aea1-45db-9a0b-ea0b7a9d113c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsToExtendCreditMember_7d80365c-5a94-4204-bbd9-6aa6adcca214" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommitmentsToExtendCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_92585609-aea1-45db-9a0b-ea0b7a9d113c" xlink:to="loc_us-gaap_CommitmentsToExtendCreditMember_7d80365c-5a94-4204-bbd9-6aa6adcca214" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HomeEquityMember_a0878720-2960-44df-b587-9a59f51a1004" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HomeEquityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_92585609-aea1-45db-9a0b-ea0b7a9d113c" xlink:to="loc_us-gaap_HomeEquityMember_a0878720-2960-44df-b587-9a59f51a1004" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StandbyLettersOfCreditMember_742e7ff7-5641-4b25-b102-cbe14860d5d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StandbyLettersOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_92585609-aea1-45db-9a0b-ea0b7a9d113c" xlink:to="loc_us-gaap_StandbyLettersOfCreditMember_742e7ff7-5641-4b25-b102-cbe14860d5d8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_ExpiryPeriodOfStandbyLetterOfCredit_71a4e65f-0178-4af5-a7ed-c61e3cfbdd29" xlink:href="pnfp-20250930.xsd#pnfp_ExpiryPeriodOfStandbyLetterOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_c69b8d59-e895-4849-a5b1-75e5fb37d0a9" xlink:to="loc_pnfp_ExpiryPeriodOfStandbyLetterOfCredit_71a4e65f-0178-4af5-a7ed-c61e3cfbdd29" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_a434cafa-45df-4445-a28a-f0eec6a4b703" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_c69b8d59-e895-4849-a5b1-75e5fb37d0a9" xlink:to="loc_us-gaap_CommitmentsAndContingencies_a434cafa-45df-4445-a28a-f0eec6a4b703" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OffBalanceSheetCreditLossLiability_891b7e6c-42e4-439a-8b99-589a561effc3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OffBalanceSheetCreditLossLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_c69b8d59-e895-4849-a5b1-75e5fb37d0a9" xlink:to="loc_us-gaap_OffBalanceSheetCreditLossLiability_891b7e6c-42e4-439a-8b99-589a561effc3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForOtherLosses_3a8564e1-8791-4a7a-ac99-89b5372adc1a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProvisionForOtherLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_c69b8d59-e895-4849-a5b1-75e5fb37d0a9" xlink:to="loc_us-gaap_ProvisionForOtherLosses_3a8564e1-8791-4a7a-ac99-89b5372adc1a" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/StockOptionsandRestrictedSharesNarrativeDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#StockOptionsandRestrictedSharesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/StockOptionsandRestrictedSharesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5e156442-4d3e-4808-a0ec-caf2336b5064" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_bfd6bafe-1e24-40a1-ab4a-d88ddd57f520" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5e156442-4d3e-4808-a0ec-caf2336b5064" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_bfd6bafe-1e24-40a1-ab4a-d88ddd57f520" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_c62e8d02-4a24-4421-a9b9-6d89d425927c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_bfd6bafe-1e24-40a1-ab4a-d88ddd57f520" xlink:to="loc_us-gaap_PlanNameAxis_c62e8d02-4a24-4421-a9b9-6d89d425927c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_c62e8d02-4a24-4421-a9b9-6d89d425927c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_c62e8d02-4a24-4421-a9b9-6d89d425927c" xlink:to="loc_us-gaap_PlanNameDomain_c62e8d02-4a24-4421-a9b9-6d89d425927c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_733e64f3-8d9b-4911-b2bf-c1dcf45ca32c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_c62e8d02-4a24-4421-a9b9-6d89d425927c" xlink:to="loc_us-gaap_PlanNameDomain_733e64f3-8d9b-4911-b2bf-c1dcf45ca32c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_A2018EquityIncentivePlanMember_97117518-0b80-4806-b14e-f4c9c8a8d57a" xlink:href="pnfp-20250930.xsd#pnfp_A2018EquityIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_733e64f3-8d9b-4911-b2bf-c1dcf45ca32c" xlink:to="loc_pnfp_A2018EquityIncentivePlanMember_97117518-0b80-4806-b14e-f4c9c8a8d57a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_A2018PlanMember_4e71b659-af8b-43ba-a688-9c0ecb7782a4" xlink:href="pnfp-20250930.xsd#pnfp_A2018PlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_733e64f3-8d9b-4911-b2bf-c1dcf45ca32c" xlink:to="loc_pnfp_A2018PlanMember_4e71b659-af8b-43ba-a688-9c0ecb7782a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_36311d58-be8c-4958-b728-3f2f42c2a6d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5e156442-4d3e-4808-a0ec-caf2336b5064" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_36311d58-be8c-4958-b728-3f2f42c2a6d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsAcquisitionsinPeriod_8a15c4d7-f82d-4f34-817f-6bb6b44d2249" xlink:href="pnfp-20250930.xsd#pnfp_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsAcquisitionsinPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5e156442-4d3e-4808-a0ec-caf2336b5064" xlink:to="loc_pnfp_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsAcquisitionsinPeriod_8a15c4d7-f82d-4f34-817f-6bb6b44d2249" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_59468cdd-d7fc-4338-817a-626c8bb6f445" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5e156442-4d3e-4808-a0ec-caf2336b5064" xlink:to="loc_us-gaap_ShareBasedCompensation_59468cdd-d7fc-4338-817a-626c8bb6f445" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_RemainingShareBasedCompensationonUnvestedRestrictedStockAwards_4af2c201-b162-4ca1-a2a5-befd78df11ce" xlink:href="pnfp-20250930.xsd#pnfp_RemainingShareBasedCompensationonUnvestedRestrictedStockAwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5e156442-4d3e-4808-a0ec-caf2336b5064" xlink:to="loc_pnfp_RemainingShareBasedCompensationonUnvestedRestrictedStockAwards_4af2c201-b162-4ca1-a2a5-befd78df11ce" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_WeightedAverageRemainingPeriodofSharebasedCompensationExpense_e2e482a5-4149-4369-ad88-623279c5ab9c" xlink:href="pnfp-20250930.xsd#pnfp_WeightedAverageRemainingPeriodofSharebasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5e156442-4d3e-4808-a0ec-caf2336b5064" xlink:to="loc_pnfp_WeightedAverageRemainingPeriodofSharebasedCompensationExpense_e2e482a5-4149-4369-ad88-623279c5ab9c" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/StockOptionsandRestrictedSharesCommonStockOptionsDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#StockOptionsandRestrictedSharesCommonStockOptionsDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/StockOptionsandRestrictedSharesCommonStockOptionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_fb74effd-96d9-4ca8-be14-b931bbb6fabd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_db838e55-ec9e-49cb-be90-00e3e83f226a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_fb74effd-96d9-4ca8-be14-b931bbb6fabd" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_db838e55-ec9e-49cb-be90-00e3e83f226a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_05ae33ce-aa18-4a31-a805-9ea9b1c65f69" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_db838e55-ec9e-49cb-be90-00e3e83f226a" xlink:to="loc_us-gaap_AwardTypeAxis_05ae33ce-aa18-4a31-a805-9ea9b1c65f69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_05ae33ce-aa18-4a31-a805-9ea9b1c65f69_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_05ae33ce-aa18-4a31-a805-9ea9b1c65f69" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_05ae33ce-aa18-4a31-a805-9ea9b1c65f69_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1da7e06a-e0a2-48bb-aa73-f7158317d472" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_05ae33ce-aa18-4a31-a805-9ea9b1c65f69" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1da7e06a-e0a2-48bb-aa73-f7158317d472" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_4a5afbb8-4459-41a4-8abf-d6232a6f1966" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1da7e06a-e0a2-48bb-aa73-f7158317d472" xlink:to="loc_us-gaap_RestrictedStockMember_4a5afbb8-4459-41a4-8abf-d6232a6f1966" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_241e791b-3d5c-40c8-81e8-147dc68b0172" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_fb74effd-96d9-4ca8-be14-b931bbb6fabd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_241e791b-3d5c-40c8-81e8-147dc68b0172" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_63654e36-a558-45b4-abfc-c3ccd3effdc5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_241e791b-3d5c-40c8-81e8-147dc68b0172" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_63654e36-a558-45b4-abfc-c3ccd3effdc5" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/StockOptionsandRestrictedSharesUnvestedRestrictedAwardsDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#StockOptionsandRestrictedSharesUnvestedRestrictedAwardsDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/StockOptionsandRestrictedSharesUnvestedRestrictedAwardsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5a8d8c79-a0a1-4e89-a773-830d45fa0df2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_2e72a0a9-f513-4cb4-832c-b424380ea756" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5a8d8c79-a0a1-4e89-a773-830d45fa0df2" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_2e72a0a9-f513-4cb4-832c-b424380ea756" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_b81528ff-09d1-4711-b1b5-3705b7876a47" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_2e72a0a9-f513-4cb4-832c-b424380ea756" xlink:to="loc_us-gaap_AwardTypeAxis_b81528ff-09d1-4711-b1b5-3705b7876a47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b81528ff-09d1-4711-b1b5-3705b7876a47_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_b81528ff-09d1-4711-b1b5-3705b7876a47" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b81528ff-09d1-4711-b1b5-3705b7876a47_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5cea0f8a-c266-4c31-9fa6-b3ca5992d1ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_b81528ff-09d1-4711-b1b5-3705b7876a47" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5cea0f8a-c266-4c31-9fa6-b3ca5992d1ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_f252d17b-5cd4-4cb9-a9aa-766b25c55f4d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5cea0f8a-c266-4c31-9fa6-b3ca5992d1ee" xlink:to="loc_us-gaap_RestrictedStockMember_f252d17b-5cd4-4cb9-a9aa-766b25c55f4d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_TimeBasedAwardsMember_3e2aa640-c09d-4f87-bd03-c84b12f82567" xlink:href="pnfp-20250930.xsd#pnfp_TimeBasedAwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5cea0f8a-c266-4c31-9fa6-b3ca5992d1ee" xlink:to="loc_pnfp_TimeBasedAwardsMember_3e2aa640-c09d-4f87-bd03-c84b12f82567" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_OutsideDirectorAwardsMember_4f9caf2b-91a9-43ba-96ea-759a93540ec7" xlink:href="pnfp-20250930.xsd#pnfp_OutsideDirectorAwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5cea0f8a-c266-4c31-9fa6-b3ca5992d1ee" xlink:to="loc_pnfp_OutsideDirectorAwardsMember_4f9caf2b-91a9-43ba-96ea-759a93540ec7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis_c47e709d-b6f2-49d4-ab54-9151caa9fbdb" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_2e72a0a9-f513-4cb4-832c-b424380ea756" xlink:to="loc_srt_TitleOfIndividualAxis_c47e709d-b6f2-49d4-ab54-9151caa9fbdb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_c47e709d-b6f2-49d4-ab54-9151caa9fbdb_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_TitleOfIndividualAxis_c47e709d-b6f2-49d4-ab54-9151caa9fbdb" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_c47e709d-b6f2-49d4-ab54-9151caa9fbdb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_fd66192e-388f-475d-a765-24f061fb7484" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_TitleOfIndividualAxis_c47e709d-b6f2-49d4-ab54-9151caa9fbdb" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_fd66192e-388f-475d-a765-24f061fb7484" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_AssociatesMember_fc40a5f9-b3ab-479b-b405-356ffa9d1662" xlink:href="pnfp-20250930.xsd#pnfp_AssociatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_fd66192e-388f-475d-a765-24f061fb7484" xlink:to="loc_pnfp_AssociatesMember_fc40a5f9-b3ab-479b-b405-356ffa9d1662" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_DirectorMember_f1a69b88-17a5-44a8-8c91-ae19c7a8de61" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_DirectorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_fd66192e-388f-475d-a765-24f061fb7484" xlink:to="loc_srt_DirectorMember_f1a69b88-17a5-44a8-8c91-ae19c7a8de61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_f8729d5e-d310-491d-ab79-30d9c2d32559" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_2e72a0a9-f513-4cb4-832c-b424380ea756" xlink:to="loc_srt_RangeAxis_f8729d5e-d310-491d-ab79-30d9c2d32559" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_f8729d5e-d310-491d-ab79-30d9c2d32559_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_f8729d5e-d310-491d-ab79-30d9c2d32559" xlink:to="loc_srt_RangeMember_f8729d5e-d310-491d-ab79-30d9c2d32559_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_a2a95cbb-a857-43ad-b41f-6916f7ab5770" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_f8729d5e-d310-491d-ab79-30d9c2d32559" xlink:to="loc_srt_RangeMember_a2a95cbb-a857-43ad-b41f-6916f7ab5770" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_a5937aa8-ca12-437d-ab79-191aab871862" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_a2a95cbb-a857-43ad-b41f-6916f7ab5770" xlink:to="loc_srt_MaximumMember_a5937aa8-ca12-437d-ab79-191aab871862" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_d511039f-8901-4c34-a431-40e3dc499b1e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5a8d8c79-a0a1-4e89-a773-830d45fa0df2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_d511039f-8901-4c34-a431-40e3dc499b1e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingVestingPeriod_76332ec9-df7c-4000-bdc7-b45e2042502f" xlink:href="pnfp-20250930.xsd#pnfp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingVestingPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_d511039f-8901-4c34-a431-40e3dc499b1e" xlink:to="loc_pnfp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingVestingPeriod_76332ec9-df7c-4000-bdc7-b45e2042502f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_2cceb1f8-5f7a-41df-ad1d-1d9fe667565f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_d511039f-8901-4c34-a431-40e3dc499b1e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_2cceb1f8-5f7a-41df-ad1d-1d9fe667565f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_f1068a90-99a9-4aa4-b016-12202659d0ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_d511039f-8901-4c34-a431-40e3dc499b1e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_f1068a90-99a9-4aa4-b016-12202659d0ba" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_59ea188d-bf1b-47d8-8fac-2563f02129c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_d511039f-8901-4c34-a431-40e3dc499b1e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_59ea188d-bf1b-47d8-8fac-2563f02129c0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesWithheldForTaxesByAssociatesLeadershipTeamAndDirectors_25aeb765-139c-4d3e-ad75-fcd1b52481cb" xlink:href="pnfp-20250930.xsd#pnfp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesWithheldForTaxesByAssociatesLeadershipTeamAndDirectors"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_d511039f-8901-4c34-a431-40e3dc499b1e" xlink:to="loc_pnfp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesWithheldForTaxesByAssociatesLeadershipTeamAndDirectors_25aeb765-139c-4d3e-ad75-fcd1b52481cb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_51ddb93d-40fa-433e-9d6b-010c747f0699" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_d511039f-8901-4c34-a431-40e3dc499b1e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_51ddb93d-40fa-433e-9d6b-010c747f0699" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_8b466cad-27de-4029-9a6a-5ad5e2f2f215" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_f7189133-da97-40cf-9f37-17ac50c3b13e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5a8d8c79-a0a1-4e89-a773-830d45fa0df2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_f7189133-da97-40cf-9f37-17ac50c3b13e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_09d2f059-ac0a-4221-8822-d8eef304f0ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_f7189133-da97-40cf-9f37-17ac50c3b13e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_09d2f059-ac0a-4221-8822-d8eef304f0ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_82dd4341-db87-4a6e-9290-98dcee0c8945" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/StockOptionsandRestrictedSharesPerformanceUnitAwardsOutstandingDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#StockOptionsandRestrictedSharesPerformanceUnitAwardsOutstandingDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/StockOptionsandRestrictedSharesPerformanceUnitAwardsOutstandingDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3b1d9e57-ec47-46a9-a38b-2ad75688c9dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3e059eb3-c6fc-4729-b411-2d39b57ba3ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3b1d9e57-ec47-46a9-a38b-2ad75688c9dd" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3e059eb3-c6fc-4729-b411-2d39b57ba3ce" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_f30407c1-c847-4e68-8f5a-e9471faa5574" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3e059eb3-c6fc-4729-b411-2d39b57ba3ce" xlink:to="loc_us-gaap_AwardTypeAxis_f30407c1-c847-4e68-8f5a-e9471faa5574" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f30407c1-c847-4e68-8f5a-e9471faa5574_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_f30407c1-c847-4e68-8f5a-e9471faa5574" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f30407c1-c847-4e68-8f5a-e9471faa5574_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_61b730ce-2d8d-418d-affa-6cc0dc33ff05" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_f30407c1-c847-4e68-8f5a-e9471faa5574" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_61b730ce-2d8d-418d-affa-6cc0dc33ff05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_RestrictedStockUnitsMember_a72a0eef-a12b-4407-8e4a-4a67d5153c18" xlink:href="pnfp-20250930.xsd#pnfp_RestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_61b730ce-2d8d-418d-affa-6cc0dc33ff05" xlink:to="loc_pnfp_RestrictedStockUnitsMember_a72a0eef-a12b-4407-8e4a-4a67d5153c18" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_A2022RestrictedStockUnitsMember_be03b4b2-5493-4e71-b980-fe3b5e320299" xlink:href="pnfp-20250930.xsd#pnfp_A2022RestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_61b730ce-2d8d-418d-affa-6cc0dc33ff05" xlink:to="loc_pnfp_A2022RestrictedStockUnitsMember_be03b4b2-5493-4e71-b980-fe3b5e320299" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_PerformanceUnitAwardsMember_65644f9b-ec32-40ca-9c56-ef7d5933f0b4" xlink:href="pnfp-20250930.xsd#pnfp_PerformanceUnitAwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_61b730ce-2d8d-418d-affa-6cc0dc33ff05" xlink:to="loc_pnfp_PerformanceUnitAwardsMember_65644f9b-ec32-40ca-9c56-ef7d5933f0b4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_A2023PerformanceUnitAwardsMember_cff9a564-84a8-4d09-a553-ad21b43cfe4c" xlink:href="pnfp-20250930.xsd#pnfp_A2023PerformanceUnitAwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_61b730ce-2d8d-418d-affa-6cc0dc33ff05" xlink:to="loc_pnfp_A2023PerformanceUnitAwardsMember_cff9a564-84a8-4d09-a553-ad21b43cfe4c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_A2022PerformanceUnitAwardsMember_ed936d9f-51fb-4089-a330-d9289bdf6a1d" xlink:href="pnfp-20250930.xsd#pnfp_A2022PerformanceUnitAwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_61b730ce-2d8d-418d-affa-6cc0dc33ff05" xlink:to="loc_pnfp_A2022PerformanceUnitAwardsMember_ed936d9f-51fb-4089-a330-d9289bdf6a1d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_A2022SpecialPerformanceUnitAwardMember_34a1a273-ce06-4115-95e7-e5943b3971f3" xlink:href="pnfp-20250930.xsd#pnfp_A2022SpecialPerformanceUnitAwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_61b730ce-2d8d-418d-affa-6cc0dc33ff05" xlink:to="loc_pnfp_A2022SpecialPerformanceUnitAwardMember_34a1a273-ce06-4115-95e7-e5943b3971f3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_A2021PerformanceUnitAwardsMember_d6583a40-9cfe-494b-9f63-60e51361c5a7" xlink:href="pnfp-20250930.xsd#pnfp_A2021PerformanceUnitAwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_61b730ce-2d8d-418d-affa-6cc0dc33ff05" xlink:to="loc_pnfp_A2021PerformanceUnitAwardsMember_d6583a40-9cfe-494b-9f63-60e51361c5a7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_A2020PerformanceUnitAwardMember_80c3a426-c7ed-472b-83ce-3b652f83d4a6" xlink:href="pnfp-20250930.xsd#pnfp_A2020PerformanceUnitAwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_61b730ce-2d8d-418d-affa-6cc0dc33ff05" xlink:to="loc_pnfp_A2020PerformanceUnitAwardMember_80c3a426-c7ed-472b-83ce-3b652f83d4a6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_A2019PerformanceUnitAwardMember_ee7d059e-1635-4c09-8a9e-b8da477b74da" xlink:href="pnfp-20250930.xsd#pnfp_A2019PerformanceUnitAwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_61b730ce-2d8d-418d-affa-6cc0dc33ff05" xlink:to="loc_pnfp_A2019PerformanceUnitAwardMember_ee7d059e-1635-4c09-8a9e-b8da477b74da" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_A2024PerformanceUnitAwardMember_e768b399-f848-4f38-b99e-023a015b3586" xlink:href="pnfp-20250930.xsd#pnfp_A2024PerformanceUnitAwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_61b730ce-2d8d-418d-affa-6cc0dc33ff05" xlink:to="loc_pnfp_A2024PerformanceUnitAwardMember_e768b399-f848-4f38-b99e-023a015b3586" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_A2024RestrictedStockUnitsMember_52d88771-8675-45a1-9c9b-d1bfc5ea9bcb" xlink:href="pnfp-20250930.xsd#pnfp_A2024RestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_61b730ce-2d8d-418d-affa-6cc0dc33ff05" xlink:to="loc_pnfp_A2024RestrictedStockUnitsMember_52d88771-8675-45a1-9c9b-d1bfc5ea9bcb" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_A2025PerformanceUnitAwardMember_83ef8286-6c4c-4ae5-807a-eb7fee4d0d9e" xlink:href="pnfp-20250930.xsd#pnfp_A2025PerformanceUnitAwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_61b730ce-2d8d-418d-affa-6cc0dc33ff05" xlink:to="loc_pnfp_A2025PerformanceUnitAwardMember_83ef8286-6c4c-4ae5-807a-eb7fee4d0d9e" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis_d50cf376-8523-4df9-b88e-5723c711fb11" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3e059eb3-c6fc-4729-b411-2d39b57ba3ce" xlink:to="loc_srt_TitleOfIndividualAxis_d50cf376-8523-4df9-b88e-5723c711fb11" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_d50cf376-8523-4df9-b88e-5723c711fb11_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_TitleOfIndividualAxis_d50cf376-8523-4df9-b88e-5723c711fb11" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_d50cf376-8523-4df9-b88e-5723c711fb11_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_6daf773e-ae6c-4594-9a68-b0254fecb748" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_TitleOfIndividualAxis_d50cf376-8523-4df9-b88e-5723c711fb11" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_6daf773e-ae6c-4594-9a68-b0254fecb748" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_SeniorExecutiveOfficersMember_cdeee0f3-07d6-4b8c-a543-611f778664dd" xlink:href="pnfp-20250930.xsd#pnfp_SeniorExecutiveOfficersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_6daf773e-ae6c-4594-9a68-b0254fecb748" xlink:to="loc_pnfp_SeniorExecutiveOfficersMember_cdeee0f3-07d6-4b8c-a543-611f778664dd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_LeadershipTeamMember_7f77cf17-61ea-4759-96cc-b4f1c7b610f3" xlink:href="pnfp-20250930.xsd#pnfp_LeadershipTeamMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_6daf773e-ae6c-4594-9a68-b0254fecb748" xlink:to="loc_pnfp_LeadershipTeamMember_7f77cf17-61ea-4759-96cc-b4f1c7b610f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_0b2c72e5-61de-4bca-b844-671c6455c958" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3e059eb3-c6fc-4729-b411-2d39b57ba3ce" xlink:to="loc_srt_RangeAxis_0b2c72e5-61de-4bca-b844-671c6455c958" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_0b2c72e5-61de-4bca-b844-671c6455c958_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_0b2c72e5-61de-4bca-b844-671c6455c958" xlink:to="loc_srt_RangeMember_0b2c72e5-61de-4bca-b844-671c6455c958_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d160bac3-fab8-448c-a822-c6f3e362e9e5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_0b2c72e5-61de-4bca-b844-671c6455c958" xlink:to="loc_srt_RangeMember_d160bac3-fab8-448c-a822-c6f3e362e9e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_1367413a-704e-4ec7-af6d-e4083fec3320" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_d160bac3-fab8-448c-a822-c6f3e362e9e5" xlink:to="loc_srt_MinimumMember_1367413a-704e-4ec7-af6d-e4083fec3320" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_9fd45a0f-f910-4066-9ecd-216930e15c04" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_d160bac3-fab8-448c-a822-c6f3e362e9e5" xlink:to="loc_srt_MaximumMember_9fd45a0f-f910-4066-9ecd-216930e15c04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_07f12b7d-f60e-44e2-bffc-cc39acb7f2a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3e059eb3-c6fc-4729-b411-2d39b57ba3ce" xlink:to="loc_us-gaap_VestingAxis_07f12b7d-f60e-44e2-bffc-cc39acb7f2a6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_07f12b7d-f60e-44e2-bffc-cc39acb7f2a6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_07f12b7d-f60e-44e2-bffc-cc39acb7f2a6" xlink:to="loc_us-gaap_VestingDomain_07f12b7d-f60e-44e2-bffc-cc39acb7f2a6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_322e6c59-e8ca-4a5a-a24b-0f1b4c5d3527" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_07f12b7d-f60e-44e2-bffc-cc39acb7f2a6" xlink:to="loc_us-gaap_VestingDomain_322e6c59-e8ca-4a5a-a24b-0f1b4c5d3527" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_Tranche2019Member_f940f873-1ecd-4638-8a7f-5db47dd15c0f" xlink:href="pnfp-20250930.xsd#pnfp_Tranche2019Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_322e6c59-e8ca-4a5a-a24b-0f1b4c5d3527" xlink:to="loc_pnfp_Tranche2019Member_f940f873-1ecd-4638-8a7f-5db47dd15c0f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_Tranche2020Member_9d867c60-81b0-416a-93a0-5bc3f734d662" xlink:href="pnfp-20250930.xsd#pnfp_Tranche2020Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_322e6c59-e8ca-4a5a-a24b-0f1b4c5d3527" xlink:to="loc_pnfp_Tranche2020Member_9d867c60-81b0-416a-93a0-5bc3f734d662" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_Tranche2021Member_5cf47343-ba9e-491d-b774-46c812fb49a6" xlink:href="pnfp-20250930.xsd#pnfp_Tranche2021Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_322e6c59-e8ca-4a5a-a24b-0f1b4c5d3527" xlink:to="loc_pnfp_Tranche2021Member_5cf47343-ba9e-491d-b774-46c812fb49a6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_Tranche2022Member_29cd7e71-c660-403e-9216-7006bb9a3976" xlink:href="pnfp-20250930.xsd#pnfp_Tranche2022Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_322e6c59-e8ca-4a5a-a24b-0f1b4c5d3527" xlink:to="loc_pnfp_Tranche2022Member_29cd7e71-c660-403e-9216-7006bb9a3976" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_Tranche20212023Member_28d4203b-5b44-450a-bcf9-6f5b49097846" xlink:href="pnfp-20250930.xsd#pnfp_Tranche20212023Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_322e6c59-e8ca-4a5a-a24b-0f1b4c5d3527" xlink:to="loc_pnfp_Tranche20212023Member_28d4203b-5b44-450a-bcf9-6f5b49097846" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_Tranche20222024Member_c31c693f-b7d3-44a0-a2b6-de96e5fd80a1" xlink:href="pnfp-20250930.xsd#pnfp_Tranche20222024Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_322e6c59-e8ca-4a5a-a24b-0f1b4c5d3527" xlink:to="loc_pnfp_Tranche20222024Member_c31c693f-b7d3-44a0-a2b6-de96e5fd80a1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_Tranche20232025Member_d1565f1c-a884-47af-a5f7-a3cfc3f5c492" xlink:href="pnfp-20250930.xsd#pnfp_Tranche20232025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_322e6c59-e8ca-4a5a-a24b-0f1b4c5d3527" xlink:to="loc_pnfp_Tranche20232025Member_d1565f1c-a884-47af-a5f7-a3cfc3f5c492" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_Tranche20242026Member_b3efeeac-a13c-4355-a7e7-2c10e247aa53" xlink:href="pnfp-20250930.xsd#pnfp_Tranche20242026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_322e6c59-e8ca-4a5a-a24b-0f1b4c5d3527" xlink:to="loc_pnfp_Tranche20242026Member_b3efeeac-a13c-4355-a7e7-2c10e247aa53" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_Tranche20252027Member_8c056568-4608-4a53-9168-11827c8109c7" xlink:href="pnfp-20250930.xsd#pnfp_Tranche20252027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_322e6c59-e8ca-4a5a-a24b-0f1b4c5d3527" xlink:to="loc_pnfp_Tranche20252027Member_8c056568-4608-4a53-9168-11827c8109c7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_fb686507-e6f8-4ad4-9cae-4b42843d8d80" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3b1d9e57-ec47-46a9-a38b-2ad75688c9dd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_fb686507-e6f8-4ad4-9cae-4b42843d8d80" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_e490fdef-c63d-4fc7-bec0-a0653eb13fb7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_fb686507-e6f8-4ad4-9cae-4b42843d8d80" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_e490fdef-c63d-4fc7-bec0-a0653eb13fb7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_a24f1770-e10d-4bf5-93b6-d3ea0c898bf9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_fb686507-e6f8-4ad4-9cae-4b42843d8d80" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_a24f1770-e10d-4bf5-93b6-d3ea0c898bf9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsRestrictionsLapsedAndSharesReleasedToAssociatesAndDirectors_b86dd683-7867-46d1-b621-93ce1e2b4eaa" xlink:href="pnfp-20250930.xsd#pnfp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsRestrictionsLapsedAndSharesReleasedToAssociatesAndDirectors"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_fb686507-e6f8-4ad4-9cae-4b42843d8d80" xlink:to="loc_pnfp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsRestrictionsLapsedAndSharesReleasedToAssociatesAndDirectors_b86dd683-7867-46d1-b621-93ce1e2b4eaa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_8bb1006e-f418-4e7b-9bef-e194f6ae3e28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_fb686507-e6f8-4ad4-9cae-4b42843d8d80" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_8bb1006e-f418-4e7b-9bef-e194f6ae3e28" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_8bdf56b4-5241-4e21-a0e6-0b4ee28008ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_fb686507-e6f8-4ad4-9cae-4b42843d8d80" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_8bdf56b4-5241-4e21-a0e6-0b4ee28008ee" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_f7a21af2-4dd3-41be-97b1-d15e23d9f13f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_75b7a577-940d-4702-99da-280107cf75f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3b1d9e57-ec47-46a9-a38b-2ad75688c9dd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_75b7a577-940d-4702-99da-280107cf75f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_6573c7a5-811e-4f33-9b19-5507dfc1b3d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_75b7a577-940d-4702-99da-280107cf75f3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_6573c7a5-811e-4f33-9b19-5507dfc1b3d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_b2d61c26-2ffe-4ded-939b-dc4025eff421" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingVestingPeriod_14cad994-bf13-4160-bf2d-e77eace0a833" xlink:href="pnfp-20250930.xsd#pnfp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingVestingPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3b1d9e57-ec47-46a9-a38b-2ad75688c9dd" xlink:to="loc_pnfp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingVestingPeriod_14cad994-bf13-4160-bf2d-e77eace0a833" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_de74425a-f867-477f-a553-6b9ab1cda496" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3b1d9e57-ec47-46a9-a38b-2ad75688c9dd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_de74425a-f867-477f-a553-6b9ab1cda496" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_ShareBasedCompensationArrangementByShareBasedPaymentAwardHoldingPeriod_db6fd4f4-53c8-49c6-bce5-ff5d982d7cbf" xlink:href="pnfp-20250930.xsd#pnfp_ShareBasedCompensationArrangementByShareBasedPaymentAwardHoldingPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3b1d9e57-ec47-46a9-a38b-2ad75688c9dd" xlink:to="loc_pnfp_ShareBasedCompensationArrangementByShareBasedPaymentAwardHoldingPeriod_db6fd4f4-53c8-49c6-bce5-ff5d982d7cbf" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/DerivativeInstrumentsNonhedgeDerivativesDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#DerivativeInstrumentsNonhedgeDerivativesDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/DerivativeInstrumentsNonhedgeDerivativesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_519b01af-325e-46d9-8a54-61c012c85f69" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_5e3c6b87-5197-4311-8f3a-2854abfd4f89" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_519b01af-325e-46d9-8a54-61c012c85f69" xlink:to="loc_us-gaap_DerivativeTable_5e3c6b87-5197-4311-8f3a-2854abfd4f89" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_74976ebc-c1a3-4327-b874-a30feafd1474" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_5e3c6b87-5197-4311-8f3a-2854abfd4f89" xlink:to="loc_us-gaap_HedgingDesignationAxis_74976ebc-c1a3-4327-b874-a30feafd1474" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_74976ebc-c1a3-4327-b874-a30feafd1474_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_74976ebc-c1a3-4327-b874-a30feafd1474" xlink:to="loc_us-gaap_HedgingDesignationDomain_74976ebc-c1a3-4327-b874-a30feafd1474_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_ac186adf-e609-43b5-a9d4-7e4357ac4b85" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_74976ebc-c1a3-4327-b874-a30feafd1474" xlink:to="loc_us-gaap_HedgingDesignationDomain_ac186adf-e609-43b5-a9d4-7e4357ac4b85" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_9930d212-dc33-46f7-bd80-537a00e22f79" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_ac186adf-e609-43b5-a9d4-7e4357ac4b85" xlink:to="loc_us-gaap_NondesignatedMember_9930d212-dc33-46f7-bd80-537a00e22f79" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_b81e942a-be11-44ac-8324-dab22f9736de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_5e3c6b87-5197-4311-8f3a-2854abfd4f89" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_b81e942a-be11-44ac-8324-dab22f9736de" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_b81e942a-be11-44ac-8324-dab22f9736de_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_b81e942a-be11-44ac-8324-dab22f9736de" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_b81e942a-be11-44ac-8324-dab22f9736de_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_6933fdb8-ac47-4eaa-b94b-9e93f3753b04" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_b81e942a-be11-44ac-8324-dab22f9736de" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_6933fdb8-ac47-4eaa-b94b-9e93f3753b04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_PayFixedAndReceiveVariableSwapsMember_24bb42a0-be11-4450-8a6e-a9519d369087" xlink:href="pnfp-20250930.xsd#pnfp_PayFixedAndReceiveVariableSwapsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_6933fdb8-ac47-4eaa-b94b-9e93f3753b04" xlink:to="loc_pnfp_PayFixedAndReceiveVariableSwapsMember_24bb42a0-be11-4450-8a6e-a9519d369087" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_PayVariableAndReceiveFixedSwapsMember_cc0c916f-7825-4a67-b0a6-537de7cdc918" xlink:href="pnfp-20250930.xsd#pnfp_PayVariableAndReceiveFixedSwapsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_6933fdb8-ac47-4eaa-b94b-9e93f3753b04" xlink:to="loc_pnfp_PayVariableAndReceiveFixedSwapsMember_cc0c916f-7825-4a67-b0a6-537de7cdc918" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsMember_00070626-05e6-4d6d-a7db-6a8ea74151a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_6933fdb8-ac47-4eaa-b94b-9e93f3753b04" xlink:to="loc_us-gaap_AssetsMember_00070626-05e6-4d6d-a7db-6a8ea74151a1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditRiskContractMember_60511149-d0a8-4e51-8183-b2a780b8890e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditRiskContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_6933fdb8-ac47-4eaa-b94b-9e93f3753b04" xlink:to="loc_us-gaap_CreditRiskContractMember_60511149-d0a8-4e51-8183-b2a780b8890e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditDefaultSwapBuyingProtectionMember_08009434-4682-4529-9156-7cfe3de661a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditDefaultSwapBuyingProtectionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_6933fdb8-ac47-4eaa-b94b-9e93f3753b04" xlink:to="loc_us-gaap_CreditDefaultSwapBuyingProtectionMember_08009434-4682-4529-9156-7cfe3de661a7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditDefaultSwapMember_0a517cb7-f19f-49e0-93f1-4f74faf87d77" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditDefaultSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_6933fdb8-ac47-4eaa-b94b-9e93f3753b04" xlink:to="loc_us-gaap_CreditDefaultSwapMember_0a517cb7-f19f-49e0-93f1-4f74faf87d77" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_ff4e2c2c-c708-4468-a3a8-8f1e05ffae8b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_5e3c6b87-5197-4311-8f3a-2854abfd4f89" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_ff4e2c2c-c708-4468-a3a8-8f1e05ffae8b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_ff4e2c2c-c708-4468-a3a8-8f1e05ffae8b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_ff4e2c2c-c708-4468-a3a8-8f1e05ffae8b" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_ff4e2c2c-c708-4468-a3a8-8f1e05ffae8b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_4edd610b-8f9f-4441-845a-e20979e02e8d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_ff4e2c2c-c708-4468-a3a8-8f1e05ffae8b" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_4edd610b-8f9f-4441-845a-e20979e02e8d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialRealEstateMember_6f35a513-85e9-4eb3-b064-1ef5eab57f08" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_4edd610b-8f9f-4441-845a-e20979e02e8d" xlink:to="loc_us-gaap_ResidentialRealEstateMember_6f35a513-85e9-4eb3-b064-1ef5eab57f08" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_738bfcd1-f313-41dc-9f8c-00362148abac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_519b01af-325e-46d9-8a54-61c012c85f69" xlink:to="loc_us-gaap_DerivativeNotionalAmount_738bfcd1-f313-41dc-9f8c-00362148abac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateDerivativesAtFairValueNet_2f92cfe1-c18f-4db3-bb47-fc6a092c04dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateDerivativesAtFairValueNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_519b01af-325e-46d9-8a54-61c012c85f69" xlink:to="loc_us-gaap_InterestRateDerivativesAtFairValueNet_2f92cfe1-c18f-4db3-bb47-fc6a092c04dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_44740fc3-a891-4014-aafc-46630f9945ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeGainLossOnDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_519b01af-325e-46d9-8a54-61c012c85f69" xlink:to="loc_us-gaap_DerivativeGainLossOnDerivativeNet_44740fc3-a891-4014-aafc-46630f9945ab" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss_58b53da3-7a27-46c5-b388-700f128da8c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_519b01af-325e-46d9-8a54-61c012c85f69" xlink:to="loc_us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss_58b53da3-7a27-46c5-b388-700f128da8c1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_de71837a-931c-44b8-8623-2437c0a9f3c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_519b01af-325e-46d9-8a54-61c012c85f69" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_de71837a-931c-44b8-8623-2437c0a9f3c9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_LossProtectionFee_53ac1e17-ca89-4ebc-8dec-b16e5c9a4377" xlink:href="pnfp-20250930.xsd#pnfp_LossProtectionFee"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_519b01af-325e-46d9-8a54-61c012c85f69" xlink:to="loc_pnfp_LossProtectionFee_53ac1e17-ca89-4ebc-8dec-b16e5c9a4377" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/DerivativeInstrumentsHedgeDerivativesDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#DerivativeInstrumentsHedgeDerivativesDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/DerivativeInstrumentsHedgeDerivativesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_fe98d594-6903-4554-82c0-f0c680ac1720" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_us-gaap_DerivativeTable_fe98d594-6903-4554-82c0-f0c680ac1720" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_f54139ad-f4c5-44bc-836f-3cb693db300f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_fe98d594-6903-4554-82c0-f0c680ac1720" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_f54139ad-f4c5-44bc-836f-3cb693db300f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_f54139ad-f4c5-44bc-836f-3cb693db300f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_f54139ad-f4c5-44bc-836f-3cb693db300f" xlink:to="loc_us-gaap_HedgingRelationshipDomain_f54139ad-f4c5-44bc-836f-3cb693db300f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_efc2e008-8e7d-4819-93da-f6ee3f084bd8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_f54139ad-f4c5-44bc-836f-3cb693db300f" xlink:to="loc_us-gaap_HedgingRelationshipDomain_efc2e008-8e7d-4819-93da-f6ee3f084bd8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_e067acfc-5c6f-4338-83f1-9d014db673bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_efc2e008-8e7d-4819-93da-f6ee3f084bd8" xlink:to="loc_us-gaap_CashFlowHedgingMember_e067acfc-5c6f-4338-83f1-9d014db673bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueHedgingMember_988b0d6b-007c-4539-80ba-803ff0d9903e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_efc2e008-8e7d-4819-93da-f6ee3f084bd8" xlink:to="loc_us-gaap_FairValueHedgingMember_988b0d6b-007c-4539-80ba-803ff0d9903e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateFloorMember_3ea6d4d7-657a-4157-b442-e45988163799" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateFloorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_efc2e008-8e7d-4819-93da-f6ee3f084bd8" xlink:to="loc_us-gaap_InterestRateFloorMember_3ea6d4d7-657a-4157-b442-e45988163799" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_f47f6013-ca49-483f-ae49-0a891b6f1f8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_efc2e008-8e7d-4819-93da-f6ee3f084bd8" xlink:to="loc_us-gaap_InterestRateContractMember_f47f6013-ca49-483f-ae49-0a891b6f1f8a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateCapMember_eb1bfad9-0f6b-445e-ae46-1243554cfdfc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateCapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_efc2e008-8e7d-4819-93da-f6ee3f084bd8" xlink:to="loc_us-gaap_InterestRateCapMember_eb1bfad9-0f6b-445e-ae46-1243554cfdfc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_f1e10547-d629-4450-9cb4-3b4ea86cac9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_fe98d594-6903-4554-82c0-f0c680ac1720" xlink:to="loc_us-gaap_HedgingDesignationAxis_f1e10547-d629-4450-9cb4-3b4ea86cac9b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_f1e10547-d629-4450-9cb4-3b4ea86cac9b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_f1e10547-d629-4450-9cb4-3b4ea86cac9b" xlink:to="loc_us-gaap_HedgingDesignationDomain_f1e10547-d629-4450-9cb4-3b4ea86cac9b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_03b6e6d8-c7cd-4520-a981-3fe566a88b65" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_f1e10547-d629-4450-9cb4-3b4ea86cac9b" xlink:to="loc_us-gaap_HedgingDesignationDomain_03b6e6d8-c7cd-4520-a981-3fe566a88b65" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_e6e83700-8543-4df0-bedc-f82674746896" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_03b6e6d8-c7cd-4520-a981-3fe566a88b65" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_e6e83700-8543-4df0-bedc-f82674746896" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_HedgedItemAxis_d6438536-589d-4a21-8d1d-ed772ef8567c" xlink:href="pnfp-20250930.xsd#pnfp_HedgedItemAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_fe98d594-6903-4554-82c0-f0c680ac1720" xlink:to="loc_pnfp_HedgedItemAxis_d6438536-589d-4a21-8d1d-ed772ef8567c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_HedgedItemDomain_d6438536-589d-4a21-8d1d-ed772ef8567c_default" xlink:href="pnfp-20250930.xsd#pnfp_HedgedItemDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_pnfp_HedgedItemAxis_d6438536-589d-4a21-8d1d-ed772ef8567c" xlink:to="loc_pnfp_HedgedItemDomain_d6438536-589d-4a21-8d1d-ed772ef8567c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_HedgedItemDomain_409313b4-684e-4bf1-b24e-327da3f2306a" xlink:href="pnfp-20250930.xsd#pnfp_HedgedItemDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_pnfp_HedgedItemAxis_d6438536-589d-4a21-8d1d-ed772ef8567c" xlink:to="loc_pnfp_HedgedItemDomain_409313b4-684e-4bf1-b24e-327da3f2306a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesInvestmentMember_52949109-0a6c-4833-af4e-d0d42a1680db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuritiesInvestmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_HedgedItemDomain_409313b4-684e-4bf1-b24e-327da3f2306a" xlink:to="loc_us-gaap_SecuritiesInvestmentMember_52949109-0a6c-4833-af4e-d0d42a1680db" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansMember_751677b6-1101-42ba-b230-e98e1164a943" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_HedgedItemDomain_409313b4-684e-4bf1-b24e-327da3f2306a" xlink:to="loc_us-gaap_LoansMember_751677b6-1101-42ba-b230-e98e1164a943" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalHomeLoanBankAdvancesMember_a54f0936-f3f9-4e72-a045-478758786319" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FederalHomeLoanBankAdvancesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_HedgedItemDomain_409313b4-684e-4bf1-b24e-327da3f2306a" xlink:to="loc_us-gaap_FederalHomeLoanBankAdvancesMember_a54f0936-f3f9-4e72-a045-478758786319" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_HedgedInterestRateTypeAxis_e3459dc3-1c3a-4cb7-b46b-fdeafc0d417b" xlink:href="pnfp-20250930.xsd#pnfp_HedgedInterestRateTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_fe98d594-6903-4554-82c0-f0c680ac1720" xlink:to="loc_pnfp_HedgedInterestRateTypeAxis_e3459dc3-1c3a-4cb7-b46b-fdeafc0d417b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_HedgedInterestRateTypeDomain_e3459dc3-1c3a-4cb7-b46b-fdeafc0d417b_default" xlink:href="pnfp-20250930.xsd#pnfp_HedgedInterestRateTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_pnfp_HedgedInterestRateTypeAxis_e3459dc3-1c3a-4cb7-b46b-fdeafc0d417b" xlink:to="loc_pnfp_HedgedInterestRateTypeDomain_e3459dc3-1c3a-4cb7-b46b-fdeafc0d417b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_HedgedInterestRateTypeDomain_f4b21f5c-86f3-490b-b766-165cd942c09a" xlink:href="pnfp-20250930.xsd#pnfp_HedgedInterestRateTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_pnfp_HedgedInterestRateTypeAxis_e3459dc3-1c3a-4cb7-b46b-fdeafc0d417b" xlink:to="loc_pnfp_HedgedInterestRateTypeDomain_f4b21f5c-86f3-490b-b766-165cd942c09a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_FederalFundsRateMember_516283c7-b649-4a0f-a87e-90d3115e1ea0" xlink:href="pnfp-20250930.xsd#pnfp_FederalFundsRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_HedgedInterestRateTypeDomain_f4b21f5c-86f3-490b-b766-165cd942c09a" xlink:to="loc_pnfp_FederalFundsRateMember_516283c7-b649-4a0f-a87e-90d3115e1ea0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_SecuredOvernightFinancingRateMember_d0c91a68-4f7f-44f2-9656-f648c867194f" xlink:href="pnfp-20250930.xsd#pnfp_SecuredOvernightFinancingRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_HedgedInterestRateTypeDomain_f4b21f5c-86f3-490b-b766-165cd942c09a" xlink:to="loc_pnfp_SecuredOvernightFinancingRateMember_d0c91a68-4f7f-44f2-9656-f648c867194f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_df02ecd8-a76e-47da-9e09-b69a9e4e4b3d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_fe98d594-6903-4554-82c0-f0c680ac1720" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_df02ecd8-a76e-47da-9e09-b69a9e4e4b3d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_df02ecd8-a76e-47da-9e09-b69a9e4e4b3d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_df02ecd8-a76e-47da-9e09-b69a9e4e4b3d" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_df02ecd8-a76e-47da-9e09-b69a9e4e4b3d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_63b2a3c3-476f-4c12-8c90-4d6e910c7e2d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_df02ecd8-a76e-47da-9e09-b69a9e4e4b3d" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_63b2a3c3-476f-4c12-8c90-4d6e910c7e2d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsMember_75abf941-8544-489d-8d98-c5284eb7aa57" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_63b2a3c3-476f-4c12-8c90-4d6e910c7e2d" xlink:to="loc_us-gaap_AssetsMember_75abf941-8544-489d-8d98-c5284eb7aa57" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityMember_82762f54-8a84-4923-8dfc-e488f4de2076" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_63b2a3c3-476f-4c12-8c90-4d6e910c7e2d" xlink:to="loc_us-gaap_LiabilityMember_82762f54-8a84-4923-8dfc-e488f4de2076" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_60aa2e12-c406-4fc1-9604-b6c563f102cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_63b2a3c3-476f-4c12-8c90-4d6e910c7e2d" xlink:to="loc_us-gaap_CashFlowHedgingMember_60aa2e12-c406-4fc1-9604-b6c563f102cf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesInvestmentMember_03cba42e-c800-4444-afdf-1a23531eae5b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuritiesInvestmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_63b2a3c3-476f-4c12-8c90-4d6e910c7e2d" xlink:to="loc_us-gaap_SecuritiesInvestmentMember_03cba42e-c800-4444-afdf-1a23531eae5b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_a2f791c1-cce3-4444-9577-80ddbc40daa9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_fe98d594-6903-4554-82c0-f0c680ac1720" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_a2f791c1-cce3-4444-9577-80ddbc40daa9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_a2f791c1-cce3-4444-9577-80ddbc40daa9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_a2f791c1-cce3-4444-9577-80ddbc40daa9" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_a2f791c1-cce3-4444-9577-80ddbc40daa9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_df469a28-ffaf-41e3-a7c6-27332aed51d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_a2f791c1-cce3-4444-9577-80ddbc40daa9" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_df469a28-ffaf-41e3-a7c6-27332aed51d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentForAmortization_8f128931-5947-403a-a07c-a0f78fa5c741" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentForAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_us-gaap_AdjustmentForAmortization_8f128931-5947-403a-a07c-a0f78fa5c741" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet_6f68343a-ccbc-40e3-bf00-f4d240daba98" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_us-gaap_InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet_6f68343a-ccbc-40e3-bf00-f4d240daba98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_b0a0f44d-cf83-4157-8f75-a45f9a803d83" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_b0a0f44d-cf83-4157-8f75-a45f9a803d83" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_ForecastedNotionalAmountOfInterestRateDerivatives_508c191b-4e0a-496c-a03f-0b2b8b0b60e9" xlink:href="pnfp-20250930.xsd#pnfp_ForecastedNotionalAmountOfInterestRateDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_pnfp_ForecastedNotionalAmountOfInterestRateDerivatives_508c191b-4e0a-496c-a03f-0b2b8b0b60e9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings_3995b8af-2ca1-40a1-9bcb-6de769339b6d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings_3995b8af-2ca1-40a1-9bcb-6de769339b6d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1_9e94f026-05a5-4c71-812c-61ca43483a31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1_9e94f026-05a5-4c71-812c-61ca43483a31" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedges_698713e0-13e4-4c28-b066-e70bff93a5dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedges_698713e0-13e4-4c28-b066-e70bff93a5dd" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_FairValueHedgingAdjustment_7a0b28da-71b7-40fd-a28d-0084d0636e76" xlink:href="pnfp-20250930.xsd#pnfp_FairValueHedgingAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_pnfp_FairValueHedgingAdjustment_7a0b28da-71b7-40fd-a28d-0084d0636e76" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration_0c9f20c0-3ed4-4814-81b9-fd2cb7c1aaeb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration_0c9f20c0-3ed4-4814-81b9-fd2cb7c1aaeb" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_WeightedAverageRemainingMaturityDerivative_6c7e81b9-5c16-4c09-90e3-4d6e3fb41aba" xlink:href="pnfp-20250930.xsd#pnfp_WeightedAverageRemainingMaturityDerivative"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_pnfp_WeightedAverageRemainingMaturityDerivative_6c7e81b9-5c16-4c09-90e3-4d6e3fb41aba" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFixedInterestRate_36c84a68-c3a9-43d8-83d4-d152f539ff2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFixedInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_us-gaap_DerivativeFixedInterestRate_36c84a68-c3a9-43d8-83d4-d152f539ff2a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeUnderlyingBasis_fefab6af-e69b-47e4-9150-78b5632ee5a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeUnderlyingBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_us-gaap_DerivativeUnderlyingBasis_fefab6af-e69b-47e4-9150-78b5632ee5a6" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueHedgesAtFairValueNet_28188ed3-ce10-4d2c-a463-d611b5a79409" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueHedgesAtFairValueNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_us-gaap_FairValueHedgesAtFairValueNet_28188ed3-ce10-4d2c-a463-d611b5a79409" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration_5fb98e6b-8f2f-454b-a520-adb66a6af584" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration_5fb98e6b-8f2f-454b-a520-adb66a6af584" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityTypeExtensibleList_b6cad3fc-73b0-486a-9739-142c30e27e59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilityTypeExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_us-gaap_DerivativeLiabilityTypeExtensibleList_b6cad3fc-73b0-486a-9739-142c30e27e59" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_TerminatedNotionalAmountOfInterestRateDerivatives_b9550016-3316-4306-837b-ccb2a142e51b" xlink:href="pnfp-20250930.xsd#pnfp_TerminatedNotionalAmountOfInterestRateDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_pnfp_TerminatedNotionalAmountOfInterestRateDerivatives_b9550016-3316-4306-837b-ccb2a142e51b" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_TerminatedFairValueAmountOfInterestRateDerivatives_3bcd7d5d-847d-4686-9778-e6ea5e6444b7" xlink:href="pnfp-20250930.xsd#pnfp_TerminatedFairValueAmountOfInterestRateDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_pnfp_TerminatedFairValueAmountOfInterestRateDerivatives_3bcd7d5d-847d-4686-9778-e6ea5e6444b7" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_GainLossOnFairValueHedgesToBeRecognizedInEarnings_e147aa73-5fcd-4ad9-b3f8-350a2511e881" xlink:href="pnfp-20250930.xsd#pnfp_GainLossOnFairValueHedgesToBeRecognizedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_pnfp_GainLossOnFairValueHedgesToBeRecognizedInEarnings_e147aa73-5fcd-4ad9-b3f8-350a2511e881" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_200fceb5-e6af-47d5-b017-e2e2f9dfaeef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_us-gaap_DerivativeNotionalAmount_200fceb5-e6af-47d5-b017-e2e2f9dfaeef" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss_c72fe07d-6bbc-48c7-89e6-86bc17bcd031" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss_c72fe07d-6bbc-48c7-89e6-86bc17bcd031" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_DerivativeTypeOfInterestReceived_e277345a-fba4-477b-af06-92aef8f8d5a4" xlink:href="pnfp-20250930.xsd#pnfp_DerivativeTypeOfInterestReceived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_pnfp_DerivativeTypeOfInterestReceived_e277345a-fba4-477b-af06-92aef8f8d5a4" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_DerivativeTypeOfInterestRatePaidOnSwap1_f6568e91-849a-4500-a646-ec30a490ac3b" xlink:href="pnfp-20250930.xsd#pnfp_DerivativeTypeOfInterestRatePaidOnSwap1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_pnfp_DerivativeTypeOfInterestRatePaidOnSwap1_f6568e91-849a-4500-a646-ec30a490ac3b" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgesDerivativeInstrumentsAtFairValueNet_7a80350f-ab26-4b02-b18f-4d4eed9b84c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashFlowHedgesDerivativeInstrumentsAtFairValueNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_us-gaap_CashFlowHedgesDerivativeInstrumentsAtFairValueNet_7a80350f-ab26-4b02-b18f-4d4eed9b84c3" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeCostOfHedgeNetOfCashReceived_518a06c3-dc53-42f7-8f67-4c495a39487d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeCostOfHedgeNetOfCashReceived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_us-gaap_DerivativeCostOfHedgeNetOfCashReceived_518a06c3-dc53-42f7-8f67-4c495a39487d" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetTypeExtensibleList_b43894a3-77c6-424f-89ed-76c3357d4f1f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssetTypeExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_722cee39-1ba7-4c76-84bb-e7bd2c9fd91e" xlink:to="loc_us-gaap_DerivativeAssetTypeExtensibleList_b43894a3-77c6-424f-89ed-76c3357d4f1f" xlink:type="arc" order="24"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/FairValueofFinancialInstrumentsDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#FairValueofFinancialInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/FairValueofFinancialInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_3f441379-018a-463f-baee-232b4f6b4fb8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_94089a91-4377-4089-8640-821b52e0088a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_3f441379-018a-463f-baee-232b4f6b4fb8" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_94089a91-4377-4089-8640-821b52e0088a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_c32940a9-fef3-4249-bce6-bfdcb8663530" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_94089a91-4377-4089-8640-821b52e0088a" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_c32940a9-fef3-4249-bce6-bfdcb8663530" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_c32940a9-fef3-4249-bce6-bfdcb8663530_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_c32940a9-fef3-4249-bce6-bfdcb8663530" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_c32940a9-fef3-4249-bce6-bfdcb8663530_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_8d3117b2-38b7-46a4-b67e-e7ba7dbe8033" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_c32940a9-fef3-4249-bce6-bfdcb8663530" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_8d3117b2-38b7-46a4-b67e-e7ba7dbe8033" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_f83677ac-8b6d-4d8a-8fbb-f6311cd7d219" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_8d3117b2-38b7-46a4-b67e-e7ba7dbe8033" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_f83677ac-8b6d-4d8a-8fbb-f6311cd7d219" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsNonrecurringMember_c739b2ae-dba4-48af-9516-711b45e2047a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsNonrecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_8d3117b2-38b7-46a4-b67e-e7ba7dbe8033" xlink:to="loc_us-gaap_FairValueMeasurementsNonrecurringMember_c739b2ae-dba4-48af-9516-711b45e2047a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_465c1574-1b7a-4525-bdee-5c7592a4f30a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_94089a91-4377-4089-8640-821b52e0088a" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_465c1574-1b7a-4525-bdee-5c7592a4f30a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_465c1574-1b7a-4525-bdee-5c7592a4f30a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_465c1574-1b7a-4525-bdee-5c7592a4f30a" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_465c1574-1b7a-4525-bdee-5c7592a4f30a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_69c0405b-7011-4d35-b23b-44380ad38eca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_465c1574-1b7a-4525-bdee-5c7592a4f30a" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_69c0405b-7011-4d35-b23b-44380ad38eca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_a7a19b74-c9aa-4e58-a8f2-edc917ca7c67" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_69c0405b-7011-4d35-b23b-44380ad38eca" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_a7a19b74-c9aa-4e58-a8f2-edc917ca7c67" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_ae7eead9-9a6a-4722-b2ec-c300390afefa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_69c0405b-7011-4d35-b23b-44380ad38eca" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_ae7eead9-9a6a-4722-b2ec-c300390afefa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_f1d42ff8-a8a6-4995-a214-f3f9eafc5417" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_69c0405b-7011-4d35-b23b-44380ad38eca" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_f1d42ff8-a8a6-4995-a214-f3f9eafc5417" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_3a0208ba-b3f8-47aa-8edf-11a0324be15c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_94089a91-4377-4089-8640-821b52e0088a" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_3a0208ba-b3f8-47aa-8edf-11a0324be15c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_3a0208ba-b3f8-47aa-8edf-11a0324be15c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_3a0208ba-b3f8-47aa-8edf-11a0324be15c" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_3a0208ba-b3f8-47aa-8edf-11a0324be15c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_a237d8ea-fdf0-4c69-a5c7-3e65bdb13a8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_3a0208ba-b3f8-47aa-8edf-11a0324be15c" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_a237d8ea-fdf0-4c69-a5c7-3e65bdb13a8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableforsaleSecuritiesMember_69573bf0-a1f5-47ca-a544-dad54a929eee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableforsaleSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_a237d8ea-fdf0-4c69-a5c7-3e65bdb13a8a" xlink:to="loc_us-gaap_AvailableforsaleSecuritiesMember_69573bf0-a1f5-47ca-a544-dad54a929eee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisAbstract_61abf18d-678a-4dc5-8850-619b3f3b0dfb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_3f441379-018a-463f-baee-232b4f6b4fb8" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisAbstract_61abf18d-678a-4dc5-8850-619b3f3b0dfb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_bf8da51d-379c-4d6a-a7a3-d41443028bca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisAbstract_61abf18d-678a-4dc5-8850-619b3f3b0dfb" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_bf8da51d-379c-4d6a-a7a3-d41443028bca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_UnitedStatesTreasurySecuritiesFairValueDisclosure_67342292-7fe1-4455-836d-ab35905b5d4a" xlink:href="pnfp-20250930.xsd#pnfp_UnitedStatesTreasurySecuritiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_bf8da51d-379c-4d6a-a7a3-d41443028bca" xlink:to="loc_pnfp_UnitedStatesTreasurySecuritiesFairValueDisclosure_67342292-7fe1-4455-836d-ab35905b5d4a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_UnitedStatesGovernmentAgencySecuritiesFairValueDisclosure_f0fc89b8-130f-4774-9649-6e14f24491d1" xlink:href="pnfp-20250930.xsd#pnfp_UnitedStatesGovernmentAgencySecuritiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_bf8da51d-379c-4d6a-a7a3-d41443028bca" xlink:to="loc_pnfp_UnitedStatesGovernmentAgencySecuritiesFairValueDisclosure_f0fc89b8-130f-4774-9649-6e14f24491d1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesAvailableForSaleFairValueDisclosure_405fc412-45cd-4e31-ba20-d5a5c00fa270" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MortgageBackedSecuritiesAvailableForSaleFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_bf8da51d-379c-4d6a-a7a3-d41443028bca" xlink:to="loc_us-gaap_MortgageBackedSecuritiesAvailableForSaleFairValueDisclosure_405fc412-45cd-4e31-ba20-d5a5c00fa270" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_StatesAndMunicipalSecuritiesFairValueDisclosure_c7e54cf1-a107-411f-833e-adf4049bf3e2" xlink:href="pnfp-20250930.xsd#pnfp_StatesAndMunicipalSecuritiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_bf8da51d-379c-4d6a-a7a3-d41443028bca" xlink:to="loc_pnfp_StatesAndMunicipalSecuritiesFairValueDisclosure_c7e54cf1-a107-411f-833e-adf4049bf3e2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_AgencyBackedSecuritiesFairValueDisclosure_e40945dc-cf63-49ed-bb7f-efd29b9ca7c3" xlink:href="pnfp-20250930.xsd#pnfp_AgencyBackedSecuritiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_bf8da51d-379c-4d6a-a7a3-d41443028bca" xlink:to="loc_pnfp_AgencyBackedSecuritiesFairValueDisclosure_e40945dc-cf63-49ed-bb7f-efd29b9ca7c3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_CorporatenotesandotherFairValueDisclosure_0d80ab51-62ec-47e0-a3a6-eb9c338ffe54" xlink:href="pnfp-20250930.xsd#pnfp_CorporatenotesandotherFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_bf8da51d-379c-4d6a-a7a3-d41443028bca" xlink:to="loc_pnfp_CorporatenotesandotherFairValueDisclosure_0d80ab51-62ec-47e0-a3a6-eb9c338ffe54" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsFairValueDisclosure_db78c8b8-f23e-43d1-8079-06b3aec0612e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_bf8da51d-379c-4d6a-a7a3-d41443028bca" xlink:to="loc_us-gaap_InvestmentsFairValueDisclosure_db78c8b8-f23e-43d1-8079-06b3aec0612e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AlternativeInvestment_c643305a-e7fb-414f-b300-411ff04d0dff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AlternativeInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_bf8da51d-379c-4d6a-a7a3-d41443028bca" xlink:to="loc_us-gaap_AlternativeInvestment_c643305a-e7fb-414f-b300-411ff04d0dff" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetAtFairValueAmount_6e082847-6c62-47c3-b222-5283cc31608a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ServicingAssetAtFairValueAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_bf8da51d-379c-4d6a-a7a3-d41443028bca" xlink:to="loc_us-gaap_ServicingAssetAtFairValueAmount_6e082847-6c62-47c3-b222-5283cc31608a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsFairValueDisclosure_2757f0b8-c9d4-4017-a369-02c3a71c7d67" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_bf8da51d-379c-4d6a-a7a3-d41443028bca" xlink:to="loc_us-gaap_OtherAssetsFairValueDisclosure_2757f0b8-c9d4-4017-a369-02c3a71c7d67" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_845e6772-d747-48b2-8382-26ff4670f5e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_bf8da51d-379c-4d6a-a7a3-d41443028bca" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_845e6772-d747-48b2-8382-26ff4670f5e2" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_50d8a832-4527-4053-8ab0-faa5eae5eb6b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisAbstract_61abf18d-678a-4dc5-8850-619b3f3b0dfb" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_50d8a832-4527-4053-8ab0-faa5eae5eb6b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesFairValueDisclosure_4d446f28-e249-4344-b217-c88ccaa9c520" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_50d8a832-4527-4053-8ab0-faa5eae5eb6b" xlink:to="loc_us-gaap_OtherLiabilitiesFairValueDisclosure_4d446f28-e249-4344-b217-c88ccaa9c520" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_4f25fdc5-d01c-4640-808b-1f6a1f7cddfe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_50d8a832-4527-4053-8ab0-faa5eae5eb6b" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_4f25fdc5-d01c-4640-808b-1f6a1f7cddfe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_FairValueAssetsAndLiabilitiesMeasuredOnNonRecurringBasisAbstract_930a807c-b5d5-45a8-b6a2-5dcbd9a1791e" xlink:href="pnfp-20250930.xsd#pnfp_FairValueAssetsAndLiabilitiesMeasuredOnNonRecurringBasisAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_3f441379-018a-463f-baee-232b4f6b4fb8" xlink:to="loc_pnfp_FairValueAssetsAndLiabilitiesMeasuredOnNonRecurringBasisAbstract_930a807c-b5d5-45a8-b6a2-5dcbd9a1791e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRealEstate_588f41ec-0f85-4332-aedf-a12b7a53b1b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherRealEstate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_FairValueAssetsAndLiabilitiesMeasuredOnNonRecurringBasisAbstract_930a807c-b5d5-45a8-b6a2-5dcbd9a1791e" xlink:to="loc_us-gaap_OtherRealEstate_588f41ec-0f85-4332-aedf-a12b7a53b1b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3_8469fe83-3948-49ab-9708-a2f32bbebc53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_3f441379-018a-463f-baee-232b4f6b4fb8" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3_8469fe83-3948-49ab-9708-a2f32bbebc53" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_FinancingReceivableCollateralDependent_0e3b85a0-dd5d-4169-bfc9-431ee50e14d0" xlink:href="pnfp-20250930.xsd#pnfp_FinancingReceivableCollateralDependent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_3f441379-018a-463f-baee-232b4f6b4fb8" xlink:to="loc_pnfp_FinancingReceivableCollateralDependent_0e3b85a0-dd5d-4169-bfc9-431ee50e14d0" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/FairValueofFinancialInstrumentsRollforwardofBalanceSheetAmountsWithinLevel3ValuationHierarchyDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#FairValueofFinancialInstrumentsRollforwardofBalanceSheetAmountsWithinLevel3ValuationHierarchyDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/FairValueofFinancialInstrumentsRollforwardofBalanceSheetAmountsWithinLevel3ValuationHierarchyDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_442bdf61-ac8c-4ff8-91c5-852f43fcc664" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_e4703242-0501-42d7-b6a4-d419380537bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_442bdf61-ac8c-4ff8-91c5-852f43fcc664" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_e4703242-0501-42d7-b6a4-d419380537bd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_f53a0f27-bb2c-457a-b70d-f4b23e2768ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_e4703242-0501-42d7-b6a4-d419380537bd" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_f53a0f27-bb2c-457a-b70d-f4b23e2768ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_f53a0f27-bb2c-457a-b70d-f4b23e2768ee_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_f53a0f27-bb2c-457a-b70d-f4b23e2768ee" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_f53a0f27-bb2c-457a-b70d-f4b23e2768ee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_8c623c93-401a-44cb-a73c-a92ab2321b12" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_f53a0f27-bb2c-457a-b70d-f4b23e2768ee" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_8c623c93-401a-44cb-a73c-a92ab2321b12" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_54697eb9-9ba0-48f2-9fc7-4bd85999fc2f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_8c623c93-401a-44cb-a73c-a92ab2321b12" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_54697eb9-9ba0-48f2-9fc7-4bd85999fc2f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_0c2ce03c-f2f4-4d14-ac35-be6cb53b1120" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_e4703242-0501-42d7-b6a4-d419380537bd" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_0c2ce03c-f2f4-4d14-ac35-be6cb53b1120" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_0c2ce03c-f2f4-4d14-ac35-be6cb53b1120_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_0c2ce03c-f2f4-4d14-ac35-be6cb53b1120" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_0c2ce03c-f2f4-4d14-ac35-be6cb53b1120_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_94ee3d88-efb3-4976-8a71-fcea75249ee4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_0c2ce03c-f2f4-4d14-ac35-be6cb53b1120" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_94ee3d88-efb3-4976-8a71-fcea75249ee4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMember_ab96b1ea-8394-44c3-b91d-52c3435a431c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_94ee3d88-efb3-4976-8a71-fcea75249ee4" xlink:to="loc_us-gaap_OtherAssetsMember_ab96b1ea-8394-44c3-b91d-52c3435a431c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableforsaleSecuritiesMember_33d01d11-cb90-438b-8c3d-8075182eda0d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableforsaleSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_94ee3d88-efb3-4976-8a71-fcea75249ee4" xlink:to="loc_us-gaap_AvailableforsaleSecuritiesMember_33d01d11-cb90-438b-8c3d-8075182eda0d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingContractsMember_9b8723ca-5ffd-416f-ab02-669bfa1f929d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ServicingContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_94ee3d88-efb3-4976-8a71-fcea75249ee4" xlink:to="loc_us-gaap_ServicingContractsMember_9b8723ca-5ffd-416f-ab02-669bfa1f929d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_7d2a742f-7fac-4062-95f2-dcb3e70366e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_442bdf61-ac8c-4ff8-91c5-852f43fcc664" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_7d2a742f-7fac-4062-95f2-dcb3e70366e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_a189f7ab-f8bf-4de8-8743-1cbb8f1c87fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_7d2a742f-7fac-4062-95f2-dcb3e70366e9" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_a189f7ab-f8bf-4de8-8743-1cbb8f1c87fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_64deec5d-c9b0-4039-b276-57a626fef109" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_7d2a742f-7fac-4062-95f2-dcb3e70366e9" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_64deec5d-c9b0-4039-b276-57a626fef109" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_fe39528f-dfad-423d-af88-9999532a6ded" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_7d2a742f-7fac-4062-95f2-dcb3e70366e9" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_fe39528f-dfad-423d-af88-9999532a6ded" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3_77409fa2-9544-4d56-af70-54525d8ab3c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_7d2a742f-7fac-4062-95f2-dcb3e70366e9" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3_77409fa2-9544-4d56-af70-54525d8ab3c0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_82af0f0a-3e19-4407-80bb-9a168374ba77" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_7d2a742f-7fac-4062-95f2-dcb3e70366e9" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_82af0f0a-3e19-4407-80bb-9a168374ba77" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues_5bb2911f-4b46-4b27-b131-9b69bf01a98f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_7d2a742f-7fac-4062-95f2-dcb3e70366e9" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues_5bb2911f-4b46-4b27-b131-9b69bf01a98f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_62cd54f0-1f49-4c61-a96b-64c21a2eb2e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_7d2a742f-7fac-4062-95f2-dcb3e70366e9" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_62cd54f0-1f49-4c61-a96b-64c21a2eb2e6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_214f4fa2-0733-4a40-aca4-3516e0f1300a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_7d2a742f-7fac-4062-95f2-dcb3e70366e9" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_214f4fa2-0733-4a40-aca4-3516e0f1300a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_663be752-8587-40df-897d-d75d66d80254" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_fb2987f9-b05a-4c0c-9fad-b7215a933f7d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/FairValueofFinancialInstrumentsCarryingAmountandEstimatedFairValueofFinancialInstrumentsDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#FairValueofFinancialInstrumentsCarryingAmountandEstimatedFairValueofFinancialInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/FairValueofFinancialInstrumentsCarryingAmountandEstimatedFairValueofFinancialInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_5277c985-cf12-482b-b150-df11d907237d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_7484608b-5a8e-483a-b74a-1c42dbebd7a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_5277c985-cf12-482b-b150-df11d907237d" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_7484608b-5a8e-483a-b74a-1c42dbebd7a6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_07ff5acc-45e8-40d6-9cff-8e6e1340ac6a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_7484608b-5a8e-483a-b74a-1c42dbebd7a6" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_07ff5acc-45e8-40d6-9cff-8e6e1340ac6a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_07ff5acc-45e8-40d6-9cff-8e6e1340ac6a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_07ff5acc-45e8-40d6-9cff-8e6e1340ac6a" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_07ff5acc-45e8-40d6-9cff-8e6e1340ac6a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_e78090df-2b22-49d0-a4d1-f9d9a0926b1e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_07ff5acc-45e8-40d6-9cff-8e6e1340ac6a" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_e78090df-2b22-49d0-a4d1-f9d9a0926b1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsNonrecurringMember_24996381-9456-4d0b-8d73-88463329c76f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsNonrecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_e78090df-2b22-49d0-a4d1-f9d9a0926b1e" xlink:to="loc_us-gaap_FairValueMeasurementsNonrecurringMember_24996381-9456-4d0b-8d73-88463329c76f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_40602a26-f5f6-4630-a49d-00ac01abefa1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_7484608b-5a8e-483a-b74a-1c42dbebd7a6" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_40602a26-f5f6-4630-a49d-00ac01abefa1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_40602a26-f5f6-4630-a49d-00ac01abefa1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_40602a26-f5f6-4630-a49d-00ac01abefa1" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_40602a26-f5f6-4630-a49d-00ac01abefa1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_64a5d7db-167f-4153-9c7d-31557b279f97" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_40602a26-f5f6-4630-a49d-00ac01abefa1" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_64a5d7db-167f-4153-9c7d-31557b279f97" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_b834d9f5-bfa2-41d3-90a8-6e94f421ba68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_64a5d7db-167f-4153-9c7d-31557b279f97" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_b834d9f5-bfa2-41d3-90a8-6e94f421ba68" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_459e0281-a417-458c-b609-b1c16eac6e23" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_64a5d7db-167f-4153-9c7d-31557b279f97" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_459e0281-a417-458c-b609-b1c16eac6e23" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_8e3619fd-530c-497b-8f76-db9133b25764" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_64a5d7db-167f-4153-9c7d-31557b279f97" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_8e3619fd-530c-497b-8f76-db9133b25764" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_3dc288be-7c08-4ff4-86c7-eb1a10860443" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_7484608b-5a8e-483a-b74a-1c42dbebd7a6" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_3dc288be-7c08-4ff4-86c7-eb1a10860443" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_3dc288be-7c08-4ff4-86c7-eb1a10860443_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_3dc288be-7c08-4ff4-86c7-eb1a10860443" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_3dc288be-7c08-4ff4-86c7-eb1a10860443_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_119e8e06-ab5e-4944-8f64-076e8dc48ce4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_3dc288be-7c08-4ff4-86c7-eb1a10860443" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_119e8e06-ab5e-4944-8f64-076e8dc48ce4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_9fdbce8d-c2b4-442c-b00b-5b4dd8658230" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_119e8e06-ab5e-4944-8f64-076e8dc48ce4" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_9fdbce8d-c2b4-442c-b00b-5b4dd8658230" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_e38788a8-307d-4321-aec6-1815dadc6216" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_119e8e06-ab5e-4944-8f64-076e8dc48ce4" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_e38788a8-307d-4321-aec6-1815dadc6216" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_8bc737fe-5e81-4340-b795-65818a44488d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_119e8e06-ab5e-4944-8f64-076e8dc48ce4" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_8bc737fe-5e81-4340-b795-65818a44488d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_e23174a1-426f-41e8-bb17-dc97e2fd4a0c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_5277c985-cf12-482b-b150-df11d907237d" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_e23174a1-426f-41e8-bb17-dc97e2fd4a0c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResell_a391c737-0114-41e5-a270-2c7f6a1a97f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuritiesPurchasedUnderAgreementsToResell"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_e23174a1-426f-41e8-bb17-dc97e2fd4a0c" xlink:to="loc_us-gaap_SecuritiesPurchasedUnderAgreementsToResell_a391c737-0114-41e5-a270-2c7f6a1a97f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesFairValue_84741185-e307-4cd5-948d-b0f7b63769c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_e23174a1-426f-41e8-bb17-dc97e2fd4a0c" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesFairValue_84741185-e307-4cd5-948d-b0f7b63769c9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableFairValueDisclosure_3dab2fc8-de6c-45bb-bacc-9bf995cf9190" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansReceivableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_e23174a1-426f-41e8-bb17-dc97e2fd4a0c" xlink:to="loc_us-gaap_LoansReceivableFairValueDisclosure_3dab2fc8-de6c-45bb-bacc-9bf995cf9190" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgagesHeldForSaleFairValueDisclosure_a2210974-8e27-4c86-8159-770e705dc8f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MortgagesHeldForSaleFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_e23174a1-426f-41e8-bb17-dc97e2fd4a0c" xlink:to="loc_us-gaap_MortgagesHeldForSaleFairValueDisclosure_a2210974-8e27-4c86-8159-770e705dc8f3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansHeldForSaleFairValueDisclosure_9fda90c6-4bfa-4714-ac96-74c28055984c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansHeldForSaleFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_e23174a1-426f-41e8-bb17-dc97e2fd4a0c" xlink:to="loc_us-gaap_LoansHeldForSaleFairValueDisclosure_9fda90c6-4bfa-4714-ac96-74c28055984c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_3754666f-dc96-4541-a219-24ff878116a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_5277c985-cf12-482b-b150-df11d907237d" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_3754666f-dc96-4541-a219-24ff878116a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_Depositsandsecuritiessoldunderagreementstorepurchasefairvaluedisclosure_d10cc6c3-8914-4314-8bd2-0d3bf0c07d27" xlink:href="pnfp-20250930.xsd#pnfp_Depositsandsecuritiessoldunderagreementstorepurchasefairvaluedisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_3754666f-dc96-4541-a219-24ff878116a5" xlink:to="loc_pnfp_Depositsandsecuritiessoldunderagreementstorepurchasefairvaluedisclosure_d10cc6c3-8914-4314-8bd2-0d3bf0c07d27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure_6a5e2783-154d-49c0-a0de-0dd944a34ca3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_3754666f-dc96-4541-a219-24ff878116a5" xlink:to="loc_us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure_6a5e2783-154d-49c0-a0de-0dd944a34ca3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations_c5427b0a-2fce-438f-b2b6-d021a3d0e339" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_3754666f-dc96-4541-a219-24ff878116a5" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations_c5427b0a-2fce-438f-b2b6-d021a3d0e339" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/RegulatoryMattersDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#RegulatoryMattersDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/RegulatoryMattersDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_6c39333d-ef82-48ea-881c-48435500205d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTable_dfdda28c-4d1b-4821-b52c-60f4bbd38340" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_6c39333d-ef82-48ea-881c-48435500205d" xlink:to="loc_us-gaap_ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTable_dfdda28c-4d1b-4821-b52c-60f4bbd38340" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_3cfa4b32-629e-44df-aeb2-c61118c0cca7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTable_dfdda28c-4d1b-4821-b52c-60f4bbd38340" xlink:to="loc_srt_ConsolidatedEntitiesAxis_3cfa4b32-629e-44df-aeb2-c61118c0cca7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_3cfa4b32-629e-44df-aeb2-c61118c0cca7_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_3cfa4b32-629e-44df-aeb2-c61118c0cca7" xlink:to="loc_srt_ConsolidatedEntitiesDomain_3cfa4b32-629e-44df-aeb2-c61118c0cca7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_5ab1c0df-c278-4af9-b103-e3af2340c3b0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_3cfa4b32-629e-44df-aeb2-c61118c0cca7" xlink:to="loc_srt_ConsolidatedEntitiesDomain_5ab1c0df-c278-4af9-b103-e3af2340c3b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ParentCompanyMember_7e3ed52d-7179-4108-b65b-47653865403f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ParentCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_5ab1c0df-c278-4af9-b103-e3af2340c3b0" xlink:to="loc_srt_ParentCompanyMember_7e3ed52d-7179-4108-b65b-47653865403f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SubsidiariesMember_d6aabf5e-4f35-4b5d-a80b-a340876e08e5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SubsidiariesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_5ab1c0df-c278-4af9-b103-e3af2340c3b0" xlink:to="loc_srt_SubsidiariesMember_d6aabf5e-4f35-4b5d-a80b-a340876e08e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_NumberOfPrecedingYears_dd09e81a-5f67-49b7-b6ac-c845d35fbf60" xlink:href="pnfp-20250930.xsd#pnfp_NumberOfPrecedingYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_6c39333d-ef82-48ea-881c-48435500205d" xlink:to="loc_pnfp_NumberOfPrecedingYears_dd09e81a-5f67-49b7-b6ac-c845d35fbf60" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries_bc5d1730-9e11-41d6-b5b9-0ded7aba89ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_6c39333d-ef82-48ea-881c-48435500205d" xlink:to="loc_us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries_bc5d1730-9e11-41d6-b5b9-0ded7aba89ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_e16d32c5-fc8e-420a-a933-641ade1c943d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_6c39333d-ef82-48ea-881c-48435500205d" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_e16d32c5-fc8e-420a-a933-641ade1c943d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableAmountPerShare_a92e2e4c-fadf-4324-b342-6d18e0e7405a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsPayableAmountPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_6c39333d-ef82-48ea-881c-48435500205d" xlink:to="loc_us-gaap_DividendsPayableAmountPerShare_a92e2e4c-fadf-4324-b342-6d18e0e7405a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_DepositaryShares_07aa39f7-7c0e-444e-bcc5-a9ee3b7c6f77" xlink:href="pnfp-20250930.xsd#pnfp_DepositaryShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_6c39333d-ef82-48ea-881c-48435500205d" xlink:to="loc_pnfp_DepositaryShares_07aa39f7-7c0e-444e-bcc5-a9ee3b7c6f77" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendRatePerDollarAmount_0fcb1764-91d6-4fc2-8da0-ed7618f4cf1a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockDividendRatePerDollarAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_6c39333d-ef82-48ea-881c-48435500205d" xlink:to="loc_us-gaap_PreferredStockDividendRatePerDollarAmount_0fcb1764-91d6-4fc2-8da0-ed7618f4cf1a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_PreferredStockDividendPerDepositaryShare_48f7ffe2-80ab-4f41-b370-412f91df9a40" xlink:href="pnfp-20250930.xsd#pnfp_PreferredStockDividendPerDepositaryShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_6c39333d-ef82-48ea-881c-48435500205d" xlink:to="loc_pnfp_PreferredStockDividendPerDepositaryShare_48f7ffe2-80ab-4f41-b370-412f91df9a40" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_ComplianceWithRegulatoryCapitalRequirementsAbstract_6d6febad-89f5-4f13-af7b-70c4e29000eb" xlink:href="pnfp-20250930.xsd#pnfp_ComplianceWithRegulatoryCapitalRequirementsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_6c39333d-ef82-48ea-881c-48435500205d" xlink:to="loc_pnfp_ComplianceWithRegulatoryCapitalRequirementsAbstract_6d6febad-89f5-4f13-af7b-70c4e29000eb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TierOneRiskBasedCapitalAbstract_882c551b-49d4-4d5c-a555-a09cdff9a4b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TierOneRiskBasedCapitalAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_ComplianceWithRegulatoryCapitalRequirementsAbstract_6d6febad-89f5-4f13-af7b-70c4e29000eb" xlink:to="loc_us-gaap_TierOneRiskBasedCapitalAbstract_882c551b-49d4-4d5c-a555-a09cdff9a4b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Capital_3dde13f2-92bb-4d64-8fbb-46788fc2a9c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Capital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TierOneRiskBasedCapitalAbstract_882c551b-49d4-4d5c-a555-a09cdff9a4b2" xlink:to="loc_us-gaap_Capital_3dde13f2-92bb-4d64-8fbb-46788fc2a9c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TierOneRiskBasedCapital_ea68fc7a-f083-418b-b968-6566b4a6b990" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TierOneRiskBasedCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TierOneRiskBasedCapitalAbstract_882c551b-49d4-4d5c-a555-a09cdff9a4b2" xlink:to="loc_us-gaap_TierOneRiskBasedCapital_ea68fc7a-f083-418b-b968-6566b4a6b990" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonEquityTierOneCapital_71fd110a-bcdb-4447-8bf8-9da121d0b409" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonEquityTierOneCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TierOneRiskBasedCapitalAbstract_882c551b-49d4-4d5c-a555-a09cdff9a4b2" xlink:to="loc_us-gaap_CommonEquityTierOneCapital_71fd110a-bcdb-4447-8bf8-9da121d0b409" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TierOneLeverageCapital_aeb877c3-039b-4071-ae37-78cdb11172b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TierOneLeverageCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TierOneRiskBasedCapitalAbstract_882c551b-49d4-4d5c-a555-a09cdff9a4b2" xlink:to="loc_us-gaap_TierOneLeverageCapital_aeb877c3-039b-4071-ae37-78cdb11172b1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RiskBasedRatiosAbstract_54aa0741-7473-4963-9499-32337d6f5237" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RiskBasedRatiosAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_ComplianceWithRegulatoryCapitalRequirementsAbstract_6d6febad-89f5-4f13-af7b-70c4e29000eb" xlink:to="loc_us-gaap_RiskBasedRatiosAbstract_54aa0741-7473-4963-9499-32337d6f5237" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalToRiskWeightedAssets_12ff5712-88c9-466c-b748-d88ca7997ffb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalToRiskWeightedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RiskBasedRatiosAbstract_54aa0741-7473-4963-9499-32337d6f5237" xlink:to="loc_us-gaap_CapitalToRiskWeightedAssets_12ff5712-88c9-466c-b748-d88ca7997ffb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets_f001660e-196f-404c-bc5b-cfe8a938f302" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RiskBasedRatiosAbstract_54aa0741-7473-4963-9499-32337d6f5237" xlink:to="loc_us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets_f001660e-196f-404c-bc5b-cfe8a938f302" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonEquityTierOneCapitalRatio_ee18d203-47ff-41c3-8245-6cd2b624685c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonEquityTierOneCapitalRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RiskBasedRatiosAbstract_54aa0741-7473-4963-9499-32337d6f5237" xlink:to="loc_us-gaap_CommonEquityTierOneCapitalRatio_ee18d203-47ff-41c3-8245-6cd2b624685c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TierOneLeverageCapitalToAverageAssets_da8de495-2425-4509-91f3-eb52ea3e7bda" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TierOneLeverageCapitalToAverageAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RiskBasedRatiosAbstract_54aa0741-7473-4963-9499-32337d6f5237" xlink:to="loc_us-gaap_TierOneLeverageCapitalToAverageAssets_da8de495-2425-4509-91f3-eb52ea3e7bda" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalAbstract_bfc9066a-930c-4a53-bd40-25f9549ddcbc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_ComplianceWithRegulatoryCapitalRequirementsAbstract_6d6febad-89f5-4f13-af7b-70c4e29000eb" xlink:to="loc_us-gaap_CapitalAbstract_bfc9066a-930c-4a53-bd40-25f9549ddcbc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalRequiredForCapitalAdequacy_475f0a89-5aae-4552-a2e4-5240a15aee30" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalRequiredForCapitalAdequacy"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalAbstract_bfc9066a-930c-4a53-bd40-25f9549ddcbc" xlink:to="loc_us-gaap_CapitalRequiredForCapitalAdequacy_475f0a89-5aae-4552-a2e4-5240a15aee30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy_1d52d44a-b16e-4e84-958f-e25edbedb55e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalAbstract_bfc9066a-930c-4a53-bd40-25f9549ddcbc" xlink:to="loc_us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy_1d52d44a-b16e-4e84-958f-e25edbedb55e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonEquityTierOneCapitalRequiredForCapitalAdequacy_6cbd598b-90fe-4d55-bbb5-d82f839b5eba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonEquityTierOneCapitalRequiredForCapitalAdequacy"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalAbstract_bfc9066a-930c-4a53-bd40-25f9549ddcbc" xlink:to="loc_us-gaap_CommonEquityTierOneCapitalRequiredForCapitalAdequacy_6cbd598b-90fe-4d55-bbb5-d82f839b5eba" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy_be2b2038-42d0-4cd8-9fc5-a77c52f30843" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalAbstract_bfc9066a-930c-4a53-bd40-25f9549ddcbc" xlink:to="loc_us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy_be2b2038-42d0-4cd8-9fc5-a77c52f30843" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeverageRatiosAbstract_cfdc0877-5455-416e-8a59-7d5e19b4225b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeverageRatiosAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_ComplianceWithRegulatoryCapitalRequirementsAbstract_6d6febad-89f5-4f13-af7b-70c4e29000eb" xlink:to="loc_us-gaap_LeverageRatiosAbstract_cfdc0877-5455-416e-8a59-7d5e19b4225b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets_5add1c6b-8af4-4467-97b2-33dae80002f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeverageRatiosAbstract_cfdc0877-5455-416e-8a59-7d5e19b4225b" xlink:to="loc_us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets_5add1c6b-8af4-4467-97b2-33dae80002f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets_afca8ece-87e8-41b0-886f-cc5b394a59aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeverageRatiosAbstract_cfdc0877-5455-416e-8a59-7d5e19b4225b" xlink:to="loc_us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets_afca8ece-87e8-41b0-886f-cc5b394a59aa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioCapitalAdequacyMinimum_661dfd96-9b1a-465b-af9f-cd27d68c39b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioCapitalAdequacyMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeverageRatiosAbstract_cfdc0877-5455-416e-8a59-7d5e19b4225b" xlink:to="loc_us-gaap_BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioCapitalAdequacyMinimum_661dfd96-9b1a-465b-af9f-cd27d68c39b5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets_adab9843-0643-42c5-8f89-46f67556b7a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeverageRatiosAbstract_cfdc0877-5455-416e-8a59-7d5e19b4225b" xlink:to="loc_us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets_adab9843-0643-42c5-8f89-46f67556b7a1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_RegulatoryMinimumToBeWellCapitalizedAmountAbstract_4fe0156b-9907-4c83-bc18-bb4d5f3ede52" xlink:href="pnfp-20250930.xsd#pnfp_RegulatoryMinimumToBeWellCapitalizedAmountAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_ComplianceWithRegulatoryCapitalRequirementsAbstract_6d6febad-89f5-4f13-af7b-70c4e29000eb" xlink:to="loc_pnfp_RegulatoryMinimumToBeWellCapitalizedAmountAbstract_4fe0156b-9907-4c83-bc18-bb4d5f3ede52" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalRequiredToBeWellCapitalized_c499c24c-538c-4790-9b2a-7f396cbe2fe6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalRequiredToBeWellCapitalized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_RegulatoryMinimumToBeWellCapitalizedAmountAbstract_4fe0156b-9907-4c83-bc18-bb4d5f3ede52" xlink:to="loc_us-gaap_CapitalRequiredToBeWellCapitalized_c499c24c-538c-4790-9b2a-7f396cbe2fe6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized_ba598447-8265-462a-b436-82edc7cbb714" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_RegulatoryMinimumToBeWellCapitalizedAmountAbstract_4fe0156b-9907-4c83-bc18-bb4d5f3ede52" xlink:to="loc_us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized_ba598447-8265-462a-b436-82edc7cbb714" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonEquityTierOneCapitalRequiredToBeWellCapitalized_6b0cf3df-c561-4629-b433-7b7ebb5548d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonEquityTierOneCapitalRequiredToBeWellCapitalized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_RegulatoryMinimumToBeWellCapitalizedAmountAbstract_4fe0156b-9907-4c83-bc18-bb4d5f3ede52" xlink:to="loc_us-gaap_CommonEquityTierOneCapitalRequiredToBeWellCapitalized_6b0cf3df-c561-4629-b433-7b7ebb5548d6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized_89e25b45-929e-40ba-ab99-c9b8b1df7f19" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_RegulatoryMinimumToBeWellCapitalizedAmountAbstract_4fe0156b-9907-4c83-bc18-bb4d5f3ede52" xlink:to="loc_us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized_89e25b45-929e-40ba-ab99-c9b8b1df7f19" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_RegulatoryMinimumToBeWellCapitalizedRatioAbstract_72f6da86-9386-4aea-86de-4d04eb892550" xlink:href="pnfp-20250930.xsd#pnfp_RegulatoryMinimumToBeWellCapitalizedRatioAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_ComplianceWithRegulatoryCapitalRequirementsAbstract_6d6febad-89f5-4f13-af7b-70c4e29000eb" xlink:to="loc_pnfp_RegulatoryMinimumToBeWellCapitalizedRatioAbstract_72f6da86-9386-4aea-86de-4d04eb892550" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets_723f8045-0dae-43b1-85f5-23f2a7e122fa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_RegulatoryMinimumToBeWellCapitalizedRatioAbstract_72f6da86-9386-4aea-86de-4d04eb892550" xlink:to="loc_us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets_723f8045-0dae-43b1-85f5-23f2a7e122fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets_16f1495a-da09-4a5c-a529-ec32c65765be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_RegulatoryMinimumToBeWellCapitalizedRatioAbstract_72f6da86-9386-4aea-86de-4d04eb892550" xlink:to="loc_us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets_16f1495a-da09-4a5c-a529-ec32c65765be" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioWellCapitalizedMinimum_57066ef7-d5c4-4f57-958e-47fdb237531e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioWellCapitalizedMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_RegulatoryMinimumToBeWellCapitalizedRatioAbstract_72f6da86-9386-4aea-86de-4d04eb892550" xlink:to="loc_us-gaap_BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioWellCapitalizedMinimum_57066ef7-d5c4-4f57-958e-47fdb237531e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets_9832a70f-1652-434e-a305-3886252f739b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_pnfp_RegulatoryMinimumToBeWellCapitalizedRatioAbstract_72f6da86-9386-4aea-86de-4d04eb892550" xlink:to="loc_us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets_9832a70f-1652-434e-a305-3886252f739b" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.pnfp.com/role/OtherborrowingsDetails" xlink:type="simple" xlink:href="pnfp-20250930.xsd#OtherborrowingsDetails"/>
  <link:definitionLink xlink:role="http://www.pnfp.com/role/OtherborrowingsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_8c96e3c1-37e4-4acf-80e5-5025916cf53a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_b0f0587d-10ac-4a0f-9b0d-3ce9a6f3935f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8c96e3c1-37e4-4acf-80e5-5025916cf53a" xlink:to="loc_us-gaap_DebtInstrumentTable_b0f0587d-10ac-4a0f-9b0d-3ce9a6f3935f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_a00075da-0b75-4b86-9547-05d66e0c668c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_b0f0587d-10ac-4a0f-9b0d-3ce9a6f3935f" xlink:to="loc_us-gaap_DebtInstrumentAxis_a00075da-0b75-4b86-9547-05d66e0c668c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_a00075da-0b75-4b86-9547-05d66e0c668c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_a00075da-0b75-4b86-9547-05d66e0c668c" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_a00075da-0b75-4b86-9547-05d66e0c668c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_d050733d-acc8-4ae4-8017-917d9fd5917e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_a00075da-0b75-4b86-9547-05d66e0c668c" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_d050733d-acc8-4ae4-8017-917d9fd5917e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_TrustPreferredSecuritiesSubjectToMandatoryRedemptionOneMember_06af4657-1afa-4a27-9ca6-f7507347f1cf" xlink:href="pnfp-20250930.xsd#pnfp_TrustPreferredSecuritiesSubjectToMandatoryRedemptionOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d050733d-acc8-4ae4-8017-917d9fd5917e" xlink:to="loc_pnfp_TrustPreferredSecuritiesSubjectToMandatoryRedemptionOneMember_06af4657-1afa-4a27-9ca6-f7507347f1cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_TrustPreferredSecuritiesSubjectToMandatoryRedemptionTwoMember_659bc5c6-833d-48b8-947c-da936f0b2b8a" xlink:href="pnfp-20250930.xsd#pnfp_TrustPreferredSecuritiesSubjectToMandatoryRedemptionTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d050733d-acc8-4ae4-8017-917d9fd5917e" xlink:to="loc_pnfp_TrustPreferredSecuritiesSubjectToMandatoryRedemptionTwoMember_659bc5c6-833d-48b8-947c-da936f0b2b8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_TrustPreferredSecuritiesSubjectToMandatoryRedemptionThreeMember_b85c97bf-4bf4-4098-ac25-89e7bbce1ee6" xlink:href="pnfp-20250930.xsd#pnfp_TrustPreferredSecuritiesSubjectToMandatoryRedemptionThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d050733d-acc8-4ae4-8017-917d9fd5917e" xlink:to="loc_pnfp_TrustPreferredSecuritiesSubjectToMandatoryRedemptionThreeMember_b85c97bf-4bf4-4098-ac25-89e7bbce1ee6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_TrustPreferredSecuritiesSubjectToMandatoryRedemptionFourMember_09038192-7308-4c43-b68b-e55cd104c67a" xlink:href="pnfp-20250930.xsd#pnfp_TrustPreferredSecuritiesSubjectToMandatoryRedemptionFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d050733d-acc8-4ae4-8017-917d9fd5917e" xlink:to="loc_pnfp_TrustPreferredSecuritiesSubjectToMandatoryRedemptionFourMember_09038192-7308-4c43-b68b-e55cd104c67a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_TrustPreferredSecuritiesSubjecttoMandatoryRedemptionFiveMember_eac729d3-fdd4-4c79-9732-6ee496ef6651" xlink:href="pnfp-20250930.xsd#pnfp_TrustPreferredSecuritiesSubjecttoMandatoryRedemptionFiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d050733d-acc8-4ae4-8017-917d9fd5917e" xlink:to="loc_pnfp_TrustPreferredSecuritiesSubjecttoMandatoryRedemptionFiveMember_eac729d3-fdd4-4c79-9732-6ee496ef6651" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_TrustPreferredSecuritiesSubjecttoMandatoryRedemptionSixMember_d879a019-3729-444e-8081-080793bbfe06" xlink:href="pnfp-20250930.xsd#pnfp_TrustPreferredSecuritiesSubjecttoMandatoryRedemptionSixMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d050733d-acc8-4ae4-8017-917d9fd5917e" xlink:to="loc_pnfp_TrustPreferredSecuritiesSubjecttoMandatoryRedemptionSixMember_d879a019-3729-444e-8081-080793bbfe06" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_TrustPreferredSecuritiesSubjecttoMandatoryRedemptionSevenMember_70b75f06-4323-4453-a67e-6313210122ab" xlink:href="pnfp-20250930.xsd#pnfp_TrustPreferredSecuritiesSubjecttoMandatoryRedemptionSevenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d050733d-acc8-4ae4-8017-917d9fd5917e" xlink:to="loc_pnfp_TrustPreferredSecuritiesSubjecttoMandatoryRedemptionSevenMember_70b75f06-4323-4453-a67e-6313210122ab" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_TrustPreferredSecuritiesSubjecttoMandatoryRedemptionEightMember_2d34f404-68ca-40e3-8747-db39a858711b" xlink:href="pnfp-20250930.xsd#pnfp_TrustPreferredSecuritiesSubjecttoMandatoryRedemptionEightMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d050733d-acc8-4ae4-8017-917d9fd5917e" xlink:to="loc_pnfp_TrustPreferredSecuritiesSubjecttoMandatoryRedemptionEightMember_2d34f404-68ca-40e3-8747-db39a858711b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_TrustPreferredSecuritiesSubjecttoMandatoryRedemptionNineMember_84eb2419-fb43-4ad9-b5f4-80cb97c93a3b" xlink:href="pnfp-20250930.xsd#pnfp_TrustPreferredSecuritiesSubjecttoMandatoryRedemptionNineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d050733d-acc8-4ae4-8017-917d9fd5917e" xlink:to="loc_pnfp_TrustPreferredSecuritiesSubjecttoMandatoryRedemptionNineMember_84eb2419-fb43-4ad9-b5f4-80cb97c93a3b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_TrustPreferredSecuritiesSubjecttoMandatoryRedemptionTenMember_6bc7ead6-b4ac-418b-b435-a5f70f767579" xlink:href="pnfp-20250930.xsd#pnfp_TrustPreferredSecuritiesSubjecttoMandatoryRedemptionTenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d050733d-acc8-4ae4-8017-917d9fd5917e" xlink:to="loc_pnfp_TrustPreferredSecuritiesSubjecttoMandatoryRedemptionTenMember_6bc7ead6-b4ac-418b-b435-a5f70f767579" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_TrustPreferredSecuritiesSubjecttoMandatoryRedemptionElevenMember_7b4fdcd0-b27a-4067-92e5-bb88dfb03b44" xlink:href="pnfp-20250930.xsd#pnfp_TrustPreferredSecuritiesSubjecttoMandatoryRedemptionElevenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d050733d-acc8-4ae4-8017-917d9fd5917e" xlink:to="loc_pnfp_TrustPreferredSecuritiesSubjecttoMandatoryRedemptionElevenMember_7b4fdcd0-b27a-4067-92e5-bb88dfb03b44" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_TrustPreferredSecuritiesSubjecttoMandatoryRedemptionTwelveMember_94149790-1e33-4d03-b4df-f489f35ab477" xlink:href="pnfp-20250930.xsd#pnfp_TrustPreferredSecuritiesSubjecttoMandatoryRedemptionTwelveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d050733d-acc8-4ae4-8017-917d9fd5917e" xlink:to="loc_pnfp_TrustPreferredSecuritiesSubjecttoMandatoryRedemptionTwelveMember_94149790-1e33-4d03-b4df-f489f35ab477" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_PinnacleFinancialNotes2019Member_5e3a6825-170b-4cb3-b708-1d76290ba8fe" xlink:href="pnfp-20250930.xsd#pnfp_PinnacleFinancialNotes2019Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d050733d-acc8-4ae4-8017-917d9fd5917e" xlink:to="loc_pnfp_PinnacleFinancialNotes2019Member_5e3a6825-170b-4cb3-b708-1d76290ba8fe" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnfp_NumberOfWhollyOwnedSubsidiaries_032d40bf-bde1-486e-99a5-a232fd8c258a" xlink:href="pnfp-20250930.xsd#pnfp_NumberOfWhollyOwnedSubsidiaries"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8c96e3c1-37e4-4acf-80e5-5025916cf53a" xlink:to="loc_pnfp_NumberOfWhollyOwnedSubsidiaries_032d40bf-bde1-486e-99a5-a232fd8c258a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_40aad47c-d34e-4a0d-a832-13647816da79" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8c96e3c1-37e4-4acf-80e5-5025916cf53a" xlink:to="loc_us-gaap_DebtInstrumentTerm_40aad47c-d34e-4a0d-a832-13647816da79" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentIssuanceDate1_77484f7e-8ece-4f45-99d8-05f5bdcf1b09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentIssuanceDate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8c96e3c1-37e4-4acf-80e5-5025916cf53a" xlink:to="loc_us-gaap_DebtInstrumentIssuanceDate1_77484f7e-8ece-4f45-99d8-05f5bdcf1b09" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentMaturityDate_21be73e0-e2cb-4938-8afa-855c770f45c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentMaturityDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8c96e3c1-37e4-4acf-80e5-5025916cf53a" xlink:to="loc_us-gaap_DebtInstrumentMaturityDate_21be73e0-e2cb-4938-8afa-855c770f45c9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubordinatedDebt_df910a3d-3278-4c89-9bc2-f3a7cfb1c865" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubordinatedDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8c96e3c1-37e4-4acf-80e5-5025916cf53a" xlink:to="loc_us-gaap_SubordinatedDebt_df910a3d-3278-4c89-9bc2-f3a7cfb1c865" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_47aea0e2-b013-4e48-abff-7d66595ba3ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8c96e3c1-37e4-4acf-80e5-5025916cf53a" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_47aea0e2-b013-4e48-abff-7d66595ba3ba" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_60fca663-4b3a-4257-b74d-460ebd3938db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentDescriptionOfVariableRateBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8c96e3c1-37e4-4acf-80e5-5025916cf53a" xlink:to="loc_us-gaap_DebtInstrumentDescriptionOfVariableRateBasis_60fca663-4b3a-4257-b74d-460ebd3938db" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_c7be022f-94b6-4526-a155-5b41f04f3f49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8c96e3c1-37e4-4acf-80e5-5025916cf53a" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_c7be022f-94b6-4526-a155-5b41f04f3f49" xlink:type="arc" order="7"/>
  </link:definitionLink>
</link:linkbase>
