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Financial Instruments With Off-balance Sheet Risk - Financial Instruments With Credit Risk (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Ceded Credit Risk [Line Items] |  |
Commitments to extend credit | $ 134,512 | $ 154,307
Unused lines of credit |  |
Ceded Credit Risk [Line Items] |  |
Commitments to extend credit | 104,131 | 100,986
Undisbursed construction loans |  |
Ceded Credit Risk [Line Items] |  |
Commitments to extend credit | 3,112 | 12,000
Home equity lines of credit |  |
Ceded Credit Risk [Line Items] |  |
Commitments to extend credit | 27,269 | 26,878
Future loan commitments |  |
Ceded Credit Risk [Line Items] |  |
Commitments to extend credit | 0 | 14,365
Financial standby letters of credit |  |
Ceded Credit Risk [Line Items] |  |
Commitments to extend credit | $ 0 | $ 78

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- 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

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 825 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479383/944-825-50-1B + Details
Name: | us-gaap_CededCreditRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

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

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

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