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v3.23.3

Fair Value and Interest Rate Risk - Narrative (Details) | Sep. 30, 2023 item $ / shares | Dec. 31, 2022 item
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Fair Value Disclosures [Abstract] |  |
Stock value par value (in usd per share) | $ / shares | $ 100 |
Number of Level 3 instruments | item | 4 | 4

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- Definition Number of Level 3 Instruments + References No definition available. + Details
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Namespace Prefix: | pnbk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents information about stock value par or stated value per share. + References No definition available. + Details
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Namespace Prefix: | pnbk_
Data Type: | dtr-types1:perShareItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration