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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