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Note 14 - Financial Instruments with Off-balance Sheet Risk (Details) - Contractual Amounts Represent Credit Risk - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Commitments to extend credit:
Commitments to extend credit	$ 86,216	$ 84,461
Future Loan Commitments [Member]
Commitments to extend credit:
Commitments to extend credit	14,912	19,734
Home Equity Lines of Credit [Member]
Commitments to extend credit:
Commitments to extend credit	25,588	23,608
Unused Line of Credit [Member]
Commitments to extend credit:
Commitments to extend credit	22,497	33,923
Undisbursed Construction Loans [Member]
Commitments to extend credit:
Commitments to extend credit	21,337	6,071
Financial Standy Letter of Credit [Member]
Commitments to extend credit:
Commitments to extend credit	$ 1,882	$ 1,125

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

- References

No definition available.

+ Details

Name:	pnbk_CommitmentsToExtendCreditAbstract
Namespace Prefix:	pnbk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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_UnusedLineOfCredit1Member
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_FinancialStandyLetterOfCredit1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: