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Commitments and Contingencies - Financial Instruments With Credit Risk (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Ceded Credit Risk [Line Items]
Commitments to extend credit	$ 53,678	$ 87,571
Unused lines of credit
Ceded Credit Risk [Line Items]
Commitments to extend credit	40,971	61,910
Undisbursed construction loans
Ceded Credit Risk [Line Items]
Commitments to extend credit	524	860
Home equity lines of credit
Ceded Credit Risk [Line Items]
Commitments to extend credit	12,183	24,476
Future loan commitments
Ceded Credit Risk [Line Items]
Commitments to extend credit	$ 0	$ 325

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

- 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
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477351/944-825-50-1B

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 825
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477351/944-825-50-1B

+ Details

Name:	us-gaap_CededCreditRiskLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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: