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Financial Instruments with Off-Balance-Sheet Risk - Additional Information (Detail) (USD $)	Mar. 31, 2014
Insurance [Abstract]
Bank's reserve based on the analysis in the unfunded commitments	$ 12,000

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- Definition

Banks reserve based on analysis in unfunded commitments.

+ References

No definition available.

+ Details

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

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- Details

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