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Note 9 - Financial Instruments With Off-balance Sheet Risk - Financial Instruments With Credit Risk (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Commitments to extend credit	$ 162,951
Unused Line of Credit [Member]
Commitments to extend credit	93,277
Undisbursed Construction Loans [Member]
Commitments to extend credit	13,994
Home Equity Lines of Credit [Member]
Commitments to extend credit	19,430
Future Loan Commitments [Member]
Commitments to extend credit	35,089
Financial Standy Letter of Credit [Member]
Commitments to extend credit	$ 1,161

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

- 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:

X

- Details

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