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Loans and Allowance for Credit Losses - Recorded Investment, Principal Balance and Related Allowance (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Financing Receivable, Nonaccrual, Interest Income, Cash Basis Method | $ 0 | $ 0 | $ 0 | $ 0 |
Financing Receivable, Nonaccrual, Interest Income Lost | 2,500,000 | $ 2,500,000 | 7,100,000 | $ 6,600,000 |
Currently performing impaired loans | $ 60,500,000 |  | $ 60,500,000 |  | $ 36,300,000

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- Definition Refers to financing receivable impaired loans that are current and in performing status. + References No definition available. + Details
Name: | pnfp_FinancingReceivableImpairedLoansCurrentAndPerforming
Namespace Prefix: | pnfp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Financing Receivable, Nonaccrual, Interest Income, Cash Basis Method + References No definition available. + Details
Name: | pnfp_FinancingReceivableNonaccrualInterestIncomeCashBasisMethod
Namespace Prefix: | pnfp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Financing Receivable, Nonaccrual, Interest Income Lost + References No definition available. + Details
Name: | pnfp_FinancingReceivableNonaccrualInterestIncomeLost
Namespace Prefix: | pnfp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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_FinancingReceivableImpairedLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration