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Deposits - Summary of Company's Deposits (Parenthetical) (Detail) (USD $)	Dec. 31, 2012
Banking And Thrift [Abstract]
Deposits held for sale	$ 24,705,381

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- Definition

Deposits held for sale.

+ References

No definition available.

+ Details

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

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- Details

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