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Note 18 - Financial Instruments with Off-balance-sheet Risk - Financial Instruments With Credit Risk (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Commitments to extend credit | $ 122,394 | $ 145,065
Unused Line of Credit [Member] |  |
Commitments to extend credit | 61,622 | 71,101
Undisbursed Construction Loans [Member] |  |
Commitments to extend credit | 25,232 | 25,367
Home Equity Lines of Credit [Member] |  |
Commitments to extend credit | 19,240 | 20,032
Future Loan Commitments [Member] |  |
Commitments to extend credit | 15,696 | 27,822
Financial Standy Letter of Credit [Member] |  |
Commitments to extend credit | $ 604 | $ 743

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
- Details
Name: | us-gaap_CededCreditRiskAxis=pnbk_UnusedLineOfCreditMember
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_HomeEquityLinesOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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