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Note 10 - Financial Instruments with Off-balance Sheet Risk (Details) - Contractual Amounts Represent Credit Risk $ in Thousands	Mar. 31, 2016 USD ($)
Note 10 - Financial Instruments with Off-balance Sheet Risk (Details) - Contractual Amounts Represent Credit Risk [Line Items]
Commitments to extend credit	$ 87,036
Future Loan Commitments [Member]
Note 10 - Financial Instruments with Off-balance Sheet Risk (Details) - Contractual Amounts Represent Credit Risk [Line Items]
Commitments to extend credit	11,758
Home Equity Lines of Credit [Member]
Note 10 - Financial Instruments with Off-balance Sheet Risk (Details) - Contractual Amounts Represent Credit Risk [Line Items]
Commitments to extend credit	25,671
Unused Line of Credit [Member]
Note 10 - Financial Instruments with Off-balance Sheet Risk (Details) - Contractual Amounts Represent Credit Risk [Line Items]
Commitments to extend credit	20,880
Undisbursed Construction Loans [Member]
Note 10 - Financial Instruments with Off-balance Sheet Risk (Details) - Contractual Amounts Represent Credit Risk [Line Items]
Commitments to extend credit	26,845
Financial Standy Letter of Credit [Member]
Note 10 - Financial Instruments with Off-balance Sheet Risk (Details) - Contractual Amounts Represent Credit Risk [Line Items]
Commitments to extend credit	$ 1,882

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_Note10FinancialInstrumentswithOffbalanceSheetRiskDetailsContractualAmountsRepresentCreditRiskLineItems
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: