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Fair Value and Interest Rate Risk - Narrative (Details)	Jun. 30, 2023 $ / shares
Fair Value Disclosures [Abstract]
Stock value par value (in usd per share)	$ 100

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- Definition

Represents information about stock value par or stated value per share.

+ References

No definition available.

+ Details

Name:	pnbk_StockValueParOrStatedValuePerShare
Namespace Prefix:	pnbk_
Data Type:	dtr-types1:perShareItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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