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Note 23 - Subsequent Event (Details Textual) - American Challenger [Member] - Subsequent Event [Member] $ / shares in Units, $ in Millions | Jan. 28, 2022 USD ($) $ / shares shares
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Business Combination, Consideration Transferred, Structuring and Advisory Fee | $ 6.5
Business Combination, Maximum Reimbursement of Cash Compensation to Employees | 7.8
Business Combination, Maximum Payment of Deferred Compensation Forfeited | $ 4.7
Business Acquisition, Potential Warrants to be Issued, Maximum Number of Shares (in shares) | shares | 1,132,000
Business Acquisition, Additional Payment Amount Per Share (in dollars per share) | $ / shares | $ 17.69

X
- Definition The per share amount of additional payment arrangement for shares to be issued in a business acquisition + References No definition available. + Details
Name: | pnbk_BusinessAcquisitionAdditionalPaymentAmountPerShare
Namespace Prefix: | pnbk_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Maximum number of securities into which the class of warrant or right may be converted for warrants that could be issued under in a business combination. + References No definition available. + Details
Name: | pnbk_BusinessAcquisitionPotentialWarrantsToBeIssuedMaximumNumberOfShares
Namespace Prefix: | pnbk_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of structuring and advisory fee incurred by the acquirer as part of consideration transferred in a business combination. + References No definition available. + Details
Name: | pnbk_BusinessCombinationConsiderationTransferredStructuringAndAdvisoryFee
Namespace Prefix: | pnbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of maximum payments for deferred compensation forfeited in a business combination. + References No definition available. + Details
Name: | pnbk_BusinessCombinationMaximumPaymentOfDeferredCompensationForfeited
Namespace Prefix: | pnbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of maximum reimbursement of cash compensation to employees as part of consideration transferred in a business combination. + References No definition available. + Details
Name: | pnbk_BusinessCombinationMaximumReimbursementOfCashCompensationToEmployees
Namespace Prefix: | pnbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=pnbk_AmericanChallengerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |