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Fair Value and Interest Rate Risk - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2013
Fair Value Disclosures [Abstract] |
Short-term borrowings | 90 days

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- Definition Maturing period of borrowings under short term repurchase agreements and other short term borrowings. + References No definition available. + Details
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Namespace Prefix: | pnbk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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