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Loans Receivable and Allowance for Loan Losses - Delinquency Status, of Non-Accrual Loans and Past Due Loans (Parenthetical) (Detail) (USD $)	Sep. 30, 2013
Receivables [Abstract]
Commercial substandard Loans	$ 6.1

X

- Definition

Commercial Loans

+ References

No definition available.

+ Details

Name:	pnbk_CommercialLoans
Namespace Prefix:	pnbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

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