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Deposits (Details Textual) (USD $)	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Deposits (Textual) [Abstract]
Certificate of Deposit Account Registry Service	$ 0	$ 1,361,544
Percentage of maximum deposit to customer of other banks in CDARS	10.00%

X

- Definition

Certificate of deposits.

+ References

No definition available.

+ Details

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

X

- Details

Name:	pnbk_DepositsTextualAbstract
Namespace Prefix:	pnbk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of maximum deposit to customer of other banks in CDARS.

+ References

No definition available.

+ Details

Name:	pnbk_PercentageOfMaximumDepositToCustomerOfOtherBanksInCdars
Namespace Prefix:	pnbk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration