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Note 10 - Contractual Amounts Represent Credit Risk (Details) $ in Thousands	Sep. 30, 2016 USD ($)
Future Loan Commitments [Member]
Commitments to extend credit	$ 17,833
Home Equity Lines of Credit [Member]
Commitments to extend credit	21,303
Unused Line of Credit [Member]
Commitments to extend credit	14,742
Undisbursed Construction Loans [Member]
Commitments to extend credit	19,574
Financial Standy Letter of Credit [Member]
Commitments to extend credit	1,313
Commitments to extend credit	$ 74,765

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_FutureLoanCommitmentsMember
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_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_FinancialStandyLetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: