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Deposits - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Deposits [Abstract]
Noninterest-bearing deposit liabilities, digital payment deposits	$ 236.9	$ 265.5

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- Definition

Noninterest-Bearing Deposit Liabilities, Digital Payment Deposits

+ References

No definition available.

+ Details

Name:	pnbk_NoninterestBearingDepositLiabilitiesDigitalPaymentDeposits
Namespace Prefix:	pnbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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