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Loans and Allowance for Credit Losses - Troubled Debt Restructurings (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 USD ($) | Mar. 31, 2021 | Dec. 31, 2021 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructurings performing as of restructure date | $ 2.3 |  | $ 2.4
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | 0 | 0 |

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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings which were performing and accruing interest as of restructure date. + References No definition available. + Details
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Namespace Prefix: | pnfp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953682-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration