<?xml version='1.0' encoding='UTF-8'?>
<FilingSummary>
  <Version>3.8.0.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>470</ContextCount>
  <ElementCount>442</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>110</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>7</UnitCount>
  <MyReports>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0001000 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>1001000 - Statement - CONSOLIDATED BALANCE SHEETS (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/ConsolidatedBalanceSheetsUnaudited</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>1001501 - Statement - CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>1002000 - Statement - CONSOLIDATED STATEMENTS OF INCOME (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/ConsolidatedStatementsOfIncomeUnaudited</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF INCOME (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>1003000 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/ConsolidatedStatementsOfComprehensiveIncomeUnaudited</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>1004000 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/ConsolidatedStatementsOfStockholdersEquityUnaudited</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>1005000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/ConsolidatedStatementsOfCashFlowsUnaudited</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>2101100 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/SummaryOfSignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>2102100 - Disclosure - Acquisitions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/Acquisitions</Role>
      <ShortName>Acquisitions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>2103100 - Disclosure - Equity method investment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/EquityMethodInvestment</Role>
      <ShortName>Equity method investment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>2104100 - Disclosure - Securities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/Securities</Role>
      <ShortName>Securities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>2105100 - Disclosure - Loans and Allowance for Loan Losses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/LoansAndAllowanceForLoanLosses</Role>
      <ShortName>Loans and Allowance for Loan Losses</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>2106100 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>2107100 - Disclosure - Commitments and Contingent Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/CommitmentsAndContingentLiabilities</Role>
      <ShortName>Commitments and Contingent Liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>2108100 - Disclosure - Stock Options and Restricted Shares</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/StockOptionsAndRestrictedShares</Role>
      <ShortName>Stock Options and Restricted Shares</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>2109100 - Disclosure - Derivative Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/DerivativeInstruments</Role>
      <ShortName>Derivative Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>2110100 - Disclosure - Fair Value of Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/FairValueOfFinancialInstruments</Role>
      <ShortName>Fair Value of Financial Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>2111100 - Disclosure - Regulatory Matters</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/RegulatoryMatters</Role>
      <ShortName>Regulatory Matters</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>2112100 - Disclosure - Subordinated Debt and Other borrowings</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/SubordinatedDebtAndOtherBorrowings</Role>
      <ShortName>Subordinated Debt and Other borrowings</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>2201201 - Disclosure - Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/SummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://pnfp.com/role/SummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>20</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>2301302 - Disclosure - Summary of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/SummaryOfSignificantAccountingPoliciesTables</Role>
      <ShortName>Summary of Significant Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pnfp.com/role/SummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>21</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>2302301 - Disclosure - Acquisitions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/AcquisitionsTables</Role>
      <ShortName>Acquisitions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pnfp.com/role/Acquisitions</ParentRole>
      <Position>22</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>2303301 - Disclosure - Equity method investment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/EquityMethodInvestmentTables</Role>
      <ShortName>Equity method investment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pnfp.com/role/EquityMethodInvestment</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>2304301 - Disclosure - Securities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/SecuritiesTables</Role>
      <ShortName>Securities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pnfp.com/role/Securities</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>2305301 - Disclosure - Loans and Allowance for Loan Losses (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/LoansAndAllowanceForLoanLossesTables</Role>
      <ShortName>Loans and Allowance for Loan Losses (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pnfp.com/role/LoansAndAllowanceForLoanLosses</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>2308301 - Disclosure - Stock Options and Restricted Shares (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/StockOptionsAndRestrictedSharesTables</Role>
      <ShortName>Stock Options and Restricted Shares (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pnfp.com/role/StockOptionsAndRestrictedShares</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>2309301 - Disclosure - Derivative Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/DerivativeInstrumentsTables</Role>
      <ShortName>Derivative Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pnfp.com/role/DerivativeInstruments</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>2310301 - Disclosure - Fair Value of Financial Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/FairValueOfFinancialInstrumentsTables</Role>
      <ShortName>Fair Value of Financial Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pnfp.com/role/FairValueOfFinancialInstruments</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>2311301 - Disclosure - Regulatory Matters (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/RegulatoryMattersTables</Role>
      <ShortName>Regulatory Matters (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pnfp.com/role/RegulatoryMatters</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>2312301 - Disclosure - Subordinated Debt and Other borrowings (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/SubordinatedDebtAndOtherBorrowingsTables</Role>
      <ShortName>Subordinated Debt and Other borrowings (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://pnfp.com/role/SubordinatedDebtAndOtherBorrowings</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>2401403 - Disclosure - Summary of Significant Accounting Policies - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/SummaryOfSignificantAccountingPoliciesNarrativeDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>2401404 - Disclosure - Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/SummaryOfSignificantAccountingPoliciesSupplementalCashFlowInformationDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>2401405 - Disclosure - Summary of Significant Accounting Policies - Basic and Diluted Net Income Per Share Calculations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/SummaryOfSignificantAccountingPoliciesBasicAndDilutedNetIncomePerShareCalculationsDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Basic and Diluted Net Income Per Share Calculations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>2402402 - Disclosure - Acquisitions - Consideration Paid and Allocation of Purchase Price to Net Assets Acquired (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/AcquisitionsConsiderationPaidAndAllocationOfPurchasePriceToNetAssetsAcquiredDetails</Role>
      <ShortName>Acquisitions - Consideration Paid and Allocation of Purchase Price to Net Assets Acquired (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>2402403 - Disclosure - Acquisitions - Net Assets Acquired (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/AcquisitionsNetAssetsAcquiredDetails</Role>
      <ShortName>Acquisitions - Net Assets Acquired (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>2402404 - Disclosure - Acquisitions - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/AcquisitionsNarrativeDetails</Role>
      <ShortName>Acquisitions - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>2402405 - Disclosure - Acquisitions - Supplemental Pro-forma Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/AcquisitionsSupplementalProFormaInformationDetails</Role>
      <ShortName>Acquisitions - Supplemental Pro-forma Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>2403402 - Disclosure - Equity method investment - Financial Position and Results of Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/EquityMethodInvestmentFinancialPositionAndResultsOfOperationsDetails</Role>
      <ShortName>Equity method investment - Financial Position and Results of Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>2403403 - Disclosure - Equity method investment - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/EquityMethodInvestmentNarrativeDetails</Role>
      <ShortName>Equity method investment - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>2404402 - Disclosure - Securities - Amortized Cost and Fair Value of Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/SecuritiesAmortizedCostAndFairValueOfSecuritiesDetails</Role>
      <ShortName>Securities - Amortized Cost and Fair Value of Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>2404403 - Disclosure - Securities- Unrealized Losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/SecuritiesUnrealizedLossesDetails</Role>
      <ShortName>Securities- Unrealized Losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>2404404 - Disclosure - Securities Securities - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/SecuritiesSecuritiesNarrativeDetails</Role>
      <ShortName>Securities Securities - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>2405402 - Disclosure - Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/LoansAndAllowanceForLoanLossesLoansAndAllowanceForLoanLossesNarrativeDetails</Role>
      <ShortName>Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>2405403 - Disclosure - Loans and Allowance for Loan Losses - Loan Classification by Risk Rating Category (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/LoansAndAllowanceForLoanLossesLoanClassificationByRiskRatingCategoryDetails</Role>
      <ShortName>Loans and Allowance for Loan Losses - Loan Classification by Risk Rating Category (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>2405404 - Disclosure - Loans and Allowance for Loan Losses - Rollforward of Purchase Credit Impaired Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/LoansAndAllowanceForLoanLossesRollforwardOfPurchaseCreditImpairedLoansDetails</Role>
      <ShortName>Loans and Allowance for Loan Losses - Rollforward of Purchase Credit Impaired Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>2405405 - Disclosure - Loans and Allowance for Loan Losses - Recorded Investment, Principal Balance and Related Allowance (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/LoansAndAllowanceForLoanLossesRecordedInvestmentPrincipalBalanceAndRelatedAllowanceDetails</Role>
      <ShortName>Loans and Allowance for Loan Losses - Recorded Investment, Principal Balance and Related Allowance (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>2405406 - Disclosure - Loans and Allowance for Loan Losses - Troubled Debt Restructurings (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/LoansAndAllowanceForLoanLossesTroubledDebtRestructuringsDetails</Role>
      <ShortName>Loans and Allowance for Loan Losses - Troubled Debt Restructurings (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>2405407 - Disclosure - Loans and Allowance for Loan Losses - Industry Classification System (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/LoansAndAllowanceForLoanLossesIndustryClassificationSystemDetails</Role>
      <ShortName>Loans and Allowance for Loan Losses - Industry Classification System (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>2405408 - Disclosure - Loans and Allowance for Loan Losses - Financing Receivables Past Due (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/LoansAndAllowanceForLoanLossesFinancingReceivablesPastDueDetails</Role>
      <ShortName>Loans and Allowance for Loan Losses - Financing Receivables Past Due (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>2405409 - Disclosure - Loans and Allowance for Loan Losses - Allowance Allocation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/LoansAndAllowanceForLoanLossesAllowanceAllocationDetails</Role>
      <ShortName>Loans and Allowance for Loan Losses - Allowance Allocation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>2405410 - Disclosure - Loans and Allowance for Loan Losses - Allowance for Credit Losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/LoansAndAllowanceForLoanLossesAllowanceForCreditLossesDetails</Role>
      <ShortName>Loans and Allowance for Loan Losses - Allowance for Credit Losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>2405411 - Disclosure - Loans and Allowance for Loan Losses - Details on Allowance for Loan Losses and Recorded Investment by Loan Classification and Impairment Evaluation Method (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/LoansAndAllowanceForLoanLossesDetailsOnAllowanceForLoanLossesAndRecordedInvestmentByLoanClassificationAndImpairmentEvaluationMethodDetails</Role>
      <ShortName>Loans and Allowance for Loan Losses - Details on Allowance for Loan Losses and Recorded Investment by Loan Classification and Impairment Evaluation Method (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>2406401 - Disclosure - Income Taxes - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/IncomeTaxesNarrativeDetails</Role>
      <ShortName>Income Taxes - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>2407401 - Disclosure - Commitments and Contingent Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/CommitmentsAndContingentLiabilitiesDetails</Role>
      <ShortName>Commitments and Contingent Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://pnfp.com/role/CommitmentsAndContingentLiabilities</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>2408402 - Disclosure - Stock Options and Restricted Shares - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/StockOptionsAndRestrictedSharesNarrativeDetails</Role>
      <ShortName>Stock Options and Restricted Shares - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>2408403 - Disclosure - Stock Options and Restricted Shares - Common Stock Options (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/StockOptionsAndRestrictedSharesCommonStockOptionsDetails</Role>
      <ShortName>Stock Options and Restricted Shares - Common Stock Options (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>2408404 - Disclosure - Stock Options and Restricted Shares - Unvested Restricted Awards (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/StockOptionsAndRestrictedSharesUnvestedRestrictedAwardsDetails</Role>
      <ShortName>Stock Options and Restricted Shares - Unvested Restricted Awards (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>2408405 - Disclosure - Stock Options and Restricted Shares - Restricted Shares Awarded (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/StockOptionsAndRestrictedSharesRestrictedSharesAwardedDetails</Role>
      <ShortName>Stock Options and Restricted Shares - Restricted Shares Awarded (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>2408406 - Disclosure - Stock Options and Restricted Shares - Restricted Share Unit Awards Outstanding (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/StockOptionsAndRestrictedSharesRestrictedShareUnitAwardsOutstandingDetails</Role>
      <ShortName>Stock Options and Restricted Shares - Restricted Share Unit Awards Outstanding (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>2409402 - Disclosure - Derivative Instruments - Non-hedge Derivatives (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/DerivativeInstrumentsNonHedgeDerivativesDetails</Role>
      <ShortName>Derivative Instruments - Non-hedge Derivatives (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>2409403 - Disclosure - Derivative Instruments - Hedge Derivatives (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/DerivativeInstrumentsHedgeDerivativesDetails</Role>
      <ShortName>Derivative Instruments - Hedge Derivatives (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>2410402 - Disclosure - Fair Value of Financial Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/FairValueOfFinancialInstrumentsDetails</Role>
      <ShortName>Fair Value of Financial Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://pnfp.com/role/FairValueOfFinancialInstrumentsTables</ParentRole>
      <Position>62</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>2410403 - Disclosure - Fair Value of Financial Instruments - Rollforward of Balance Sheet Amounts Within Level 3 Valuation Hierarchy (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/FairValueOfFinancialInstrumentsRollforwardOfBalanceSheetAmountsWithinLevel3ValuationHierarchyDetails</Role>
      <ShortName>Fair Value of Financial Instruments - Rollforward of Balance Sheet Amounts Within Level 3 Valuation Hierarchy (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>2410404 - Disclosure - Fair Value of Financial Instruments - Carrying Amount and Estimated Fair Value of Financial Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/FairValueOfFinancialInstrumentsCarryingAmountAndEstimatedFairValueOfFinancialInstrumentsDetails</Role>
      <ShortName>Fair Value of Financial Instruments - Carrying Amount and Estimated Fair Value of Financial Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>2411402 - Disclosure - Regulatory Matters (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/RegulatoryMattersDetails</Role>
      <ShortName>Regulatory Matters (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://pnfp.com/role/RegulatoryMattersTables</ParentRole>
      <Position>65</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>2412402 - Disclosure - Subordinated Debt and Other borrowings - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/SubordinatedDebtAndOtherBorrowingsNarrativeDetails</Role>
      <ShortName>Subordinated Debt and Other borrowings - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="pnfp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>2412403 - Disclosure - Subordinated Debt and Other borrowings (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://pnfp.com/role/SubordinatedDebtAndOtherBorrowingsDetails</Role>
      <ShortName>Subordinated Debt and Other borrowings (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://pnfp.com/role/SubordinatedDebtAndOtherBorrowingsTables</ParentRole>
      <Position>67</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>pnfp-20180331.xml</File>
    <File>pnfp-20180331.xsd</File>
    <File>pnfp-20180331_cal.xml</File>
    <File>pnfp-20180331_def.xml</File>
    <File>pnfp-20180331_lab.xml</File>
    <File>pnfp-20180331_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy>http://fasb.org/us-gaap/2016-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/invest/2013-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2014-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/sic/2011-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
