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Note 14 - Financial Instruments with Off-balance Sheet Risk (Details) - Contractual Amounts Represent Credit Risk - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Commitments to extend credit: |  |
Commitments to extend credit | $ 86,216 | $ 84,461
Future Loan Commitments [Member] |  |
Commitments to extend credit: |  |
Commitments to extend credit | 14,912 | 19,734
Home Equity Lines of Credit [Member] |  |
Commitments to extend credit: |  |
Commitments to extend credit | 25,588 | 23,608
Unused Line of Credit [Member] |  |
Commitments to extend credit: |  |
Commitments to extend credit | 22,497 | 33,923
Undisbursed Construction Loans [Member] |  |
Commitments to extend credit: |  |
Commitments to extend credit | 21,337 | 6,071
Financial Standy Letter of Credit [Member] |  |
Commitments to extend credit: |  |
Commitments to extend credit | $ 1,882 | $ 1,125

X
- Definition Commitments to extend credit. + References No definition available. + Details
Name: | pnbk_CommitmentsToExtendCredit
Namespace Prefix: | pnbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | pnbk_CommitmentsToExtendCreditAbstract
Namespace Prefix: | pnbk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_CededCreditRiskAxis=pnbk_FutureLoanCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CededCreditRiskAxis=pnbk_HomeEquityLinesOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CededCreditRiskAxis=pnbk_UnusedLineOfCredit1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CededCreditRiskAxis=pnbk_UndisbursedConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CededCreditRiskAxis=pnbk_FinancialStandyLetterOfCredit1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |