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Fair Value and Interest Rate Risk - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Fair Value Disclosures [Abstract]
Short-term borrowings	90 days
Transfer of assets between level 1 , 2 or 3	$ 0	$ 0

X

- Definition

Fair value assets level one to level three transfers amount.

+ References

No definition available.

+ Details

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

X

- Definition

Maturing period of borrowings under short term repurchase agreements and other short term borrowings.

+ References

No definition available.

+ Details

Name:	pnbk_MaturingPeriodOfBorrowingsUnderShortTermRepurchaseAgreementsAndOtherShortTermBorrowings
Namespace Prefix:	pnbk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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