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

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_InterestBearingDepositLiabilitiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration