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Deposits - Summary of Company's Deposits (Parenthetical) (Detail) (USD $) | Dec. 31, 2012
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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