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Deposits - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Interest-Bearing Deposit Liabilities [Abstract] |  |
Aggregate amount of time deposits | $ 3,850 | $ 3,720

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- Definition Time Deposits, $250,000 or More + References No definition available. + Details
Name: | pnfp_TimeDeposits250000orMore
Namespace Prefix: | pnfp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_InterestBearingDepositLiabilitiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration