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Note 15 - Financial Instruments with Off-Balance-Sheet Risk (Details) - Contractual Amounts Represent Credit Risk (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Note 15 - Financial Instruments with Off-Balance-Sheet Risk (Details) - Contractual Amounts Represent Credit Risk [Line Items]  
Commitments to extend credit $ 84,461pnbk_CommitmentsToExtendCredit
Future Loan Commitments [Member]  
Note 15 - Financial Instruments with Off-Balance-Sheet Risk (Details) - Contractual Amounts Represent Credit Risk [Line Items]  
Commitments to extend credit 19,734pnbk_CommitmentsToExtendCredit
/ us-gaap_CededCreditRiskAxis
= pnbk_FutureLoanCommitmentsMember
Home Equity Lines of Credit [Member]  
Note 15 - Financial Instruments with Off-Balance-Sheet Risk (Details) - Contractual Amounts Represent Credit Risk [Line Items]  
Commitments to extend credit 23,608pnbk_CommitmentsToExtendCredit
/ us-gaap_CededCreditRiskAxis
= pnbk_HomeEquityLinesOfCreditMember
Unused Line of Credit [Member]  
Note 15 - Financial Instruments with Off-Balance-Sheet Risk (Details) - Contractual Amounts Represent Credit Risk [Line Items]  
Commitments to extend credit 33,923pnbk_CommitmentsToExtendCredit
/ us-gaap_CededCreditRiskAxis
= pnbk_UnusedLineOfCredit1Member
Undisbursed Construction Loans [Member]  
Note 15 - Financial Instruments with Off-Balance-Sheet Risk (Details) - Contractual Amounts Represent Credit Risk [Line Items]  
Commitments to extend credit 6,071pnbk_CommitmentsToExtendCredit
/ us-gaap_CededCreditRiskAxis
= pnbk_UndisbursedConstructionLoansMember
Financial Standy Letter of Credit [Member]  
Note 15 - 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