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Financial Instruments With Off-balance Sheet Risk - Narrative (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Risks and Uncertainties [Abstract] |  |
Banks reserve based on analysis in unfunded commitments | $ 1,400 | $ 8

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- Definition Banks reserve based on analysis in unfunded commitments. + References No definition available. + Details
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Namespace Prefix: | pnbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_RisksAndUncertaintiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration