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Note 14 - Financial Instruments With Off-balance Sheet Risk - Financial Instruments with Credit Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Commitments to extend credit	$ 117,225	$ 98,370
Unused Line of Credit [Member]
Commitments to extend credit	63,760	39,063
Undisbursed Construction Loans [Member]
Commitments to extend credit	7,930	21,224
Home Equity Lines of Credit [Member]
Commitments to extend credit	19,727	20,846
Future Loan Commitments [Member]
Commitments to extend credit	24,675	15,755
Financial Standy Letter of Credit [Member]
Commitments to extend credit	$ 1,133	$ 1,482

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: