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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
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Receivables [Abstract] |
Commercial substandard Loans | $ 6.1

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- 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