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Note 9 - Financial Instruments with Off-Balance Sheet Risk (Details) - Contractual Amounts Represent Credit Risk (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Note 9 - Financial Instruments with Off-Balance Sheet Risk (Details) - Contractual Amounts Represent Credit Risk [Line Items]
Commitments to extend credit	$ 67,898pnbk_CommitmentsToExtendCredit
Future Loan Commitments [Member]
Note 9 - Financial Instruments with Off-Balance Sheet Risk (Details) - Contractual Amounts Represent Credit Risk [Line Items]
Commitments to extend credit	9,629pnbk_CommitmentsToExtendCredit / us-gaap_CededCreditRiskAxis = pnbk_FutureLoanCommitmentsMember
Home Equity Lines of Credit [Member]
Note 9 - Financial Instruments with Off-Balance Sheet Risk (Details) - Contractual Amounts Represent Credit Risk [Line Items]
Commitments to extend credit	24,783pnbk_CommitmentsToExtendCredit / us-gaap_CededCreditRiskAxis = pnbk_HomeEquityLinesOfCreditMember
Unused Line of Credit [Member]
Note 9 - Financial Instruments with Off-Balance Sheet Risk (Details) - Contractual Amounts Represent Credit Risk [Line Items]
Commitments to extend credit	24,117pnbk_CommitmentsToExtendCredit / us-gaap_CededCreditRiskAxis = pnbk_UnusedLineOfCredit1Member
Undisbursed Construction Loans [Member]
Note 9 - Financial Instruments with Off-Balance Sheet Risk (Details) - Contractual Amounts Represent Credit Risk [Line Items]
Commitments to extend credit	8,244pnbk_CommitmentsToExtendCredit / us-gaap_CededCreditRiskAxis = pnbk_UndisbursedConstructionLoansMember
Financial Standy Letter of Credit [Member]
Note 9 - Financial Instruments with Off-Balance Sheet Risk (Details) - Contractual Amounts Represent Credit Risk [Line Items]
Commitments to extend credit	$ 1,125pnbk_CommitmentsToExtendCredit / us-gaap_CededCreditRiskAxis = pnbk_FinancialStandyLetterOfCredit1Member

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- Definition

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