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Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans (USD $)
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Loans Receivable $ 499,359,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 476,908,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 420,603,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Real Estate Construction [Member] | Performing and Accruing Loans [Member] | Pass [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Current 7,024,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= pnbk_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 3,096,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= pnbk_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Total Loan Balances 7,024,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= pnbk_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 3,096,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= pnbk_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Total Loans Receivable 7,024,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= pnbk_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 3,096,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= pnbk_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Real Estate Construction to Permanent [Member] | Performing and Accruing Loans [Member] | Pass [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Current 9,988,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= pnbk_RealEstateConstructionToPermanentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 10,627,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= pnbk_RealEstateConstructionToPermanentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Total Loan Balances 9,988,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= pnbk_RealEstateConstructionToPermanentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 10,627,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= pnbk_RealEstateConstructionToPermanentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Total Loans Receivable 9,988,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= pnbk_RealEstateConstructionToPermanentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 10,627,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= pnbk_RealEstateConstructionToPermanentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Performing and Accruing Loans [Member] | Pass [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 40,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables30To59DaysPastDueMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 1,520,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables30To59DaysPastDueMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Performing and Accruing Loans [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 40,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables30To59DaysPastDueMember		 1,520,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables30To59DaysPastDueMember		  
Commercial Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Performing and Accruing Loans [Member] | Pass [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due   279,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Commercial Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Performing and Accruing Loans [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due   279,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember		  
Commercial Portfolio Segment [Member] | Performing and Accruing Loans [Member] | Pass [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 40,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 1,799,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Current 46,732,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 46,279,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Total Loan Balances 46,772,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 48,078,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Total Loans Receivable 46,772,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 48,078,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Commercial Portfolio Segment [Member] | Performing and Accruing Loans [Member] | Special Mention [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Current 113,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 121,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		  
Total Loan Balances 113,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 121,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		  
Total Loans Receivable 113,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 121,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		  
Commercial Portfolio Segment [Member] | Performing and Accruing Loans [Member] | Substandard [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Current 5,591,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 5,772,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		  
Total Loan Balances 5,591,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 5,772,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		  
Total Non-Accrual and Past Due Loans   2,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		  
Total Loans Receivable 5,591,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 5,774,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		  
Commercial Portfolio Segment [Member] | Performing and Accruing Loans [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 40,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember		 1,799,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember		  
Current 52,436,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember		 52,172,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember		  
Total Loan Balances 52,476,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember		 53,971,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember		  
Total Non-Accrual and Past Due Loans   2,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember		  
Total Loans Receivable 52,476,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember		 53,973,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember		  
Commercial Portfolio Segment [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Loans Receivable 52,476,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember		 53,973,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember		 38,838,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Performing and Accruing Loans [Member] | Special Mention [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 1,032,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables30To59DaysPastDueMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 1,041,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables30To59DaysPastDueMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		  
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Performing and Accruing Loans [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 1,032,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables30To59DaysPastDueMember		 1,041,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables30To59DaysPastDueMember		  
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Performing and Accruing Loans [Member] | Substandard [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due   815,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables60To89DaysPastDueMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		  
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Performing and Accruing Loans [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due   815,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables60To89DaysPastDueMember		  
Commercial Real Estate Portfolio Segment [Member] | Performing and Accruing Loans [Member] | Pass [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Current 271,956,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 248,132,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Total Loan Balances 271,956,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 248,132,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Total Loans Receivable 271,956,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 248,132,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Commercial Real Estate Portfolio Segment [Member] | Performing and Accruing Loans [Member] | Special Mention [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 1,032,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 1,041,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		  
Current 5,986,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 2,887,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		  
Total Loan Balances 7,018,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 3,928,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		  
Total Loans Receivable 7,018,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 3,928,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		  
Commercial Real Estate Portfolio Segment [Member] | Performing and Accruing Loans [Member] | Substandard [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due   815,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		  
Current 2,278,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 1,492,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		  
Total Loan Balances 2,278,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 2,307,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		  
Total Non-Accrual and Past Due Loans 135,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 138,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		  
Total Loans Receivable 2,413,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 2,445,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		  
Commercial Real Estate Portfolio Segment [Member] | Performing and Accruing Loans [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 1,032,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 1,856,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		  
Current 280,220,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 252,511,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		  
Total Loan Balances 281,252,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 254,367,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		  
Total Non-Accrual and Past Due Loans 135,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 138,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		  
Total Loans Receivable 281,387,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 254,505,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		  
Commercial Real Estate Portfolio Segment [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Loans Receivable 281,387,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 254,505,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 217,674,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Real Estate Construction [Member] | Performing and Accruing Loans [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Current 7,024,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= pnbk_RealEstateConstructionMember		 3,096,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= pnbk_RealEstateConstructionMember		  
Total Loan Balances 7,024,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= pnbk_RealEstateConstructionMember		 3,096,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= pnbk_RealEstateConstructionMember		  
Total Loans Receivable 7,024,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= pnbk_RealEstateConstructionMember		 3,096,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= pnbk_RealEstateConstructionMember		  
Real Estate Construction [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Loans Receivable 7,024,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= pnbk_RealEstateConstructionMember		 3,096,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= pnbk_RealEstateConstructionMember		 260,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= pnbk_RealEstateConstructionMember
Construction to Permanent [Member] | Performing and Accruing Loans [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Current 9,988,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= pnbk_ConstructionToPermanentMember		 10,627,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= pnbk_ConstructionToPermanentMember		  
Total Loan Balances 9,988,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= pnbk_ConstructionToPermanentMember		 10,627,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= pnbk_ConstructionToPermanentMember		  
Total Loans Receivable 9,988,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= pnbk_ConstructionToPermanentMember		 10,627,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= pnbk_ConstructionToPermanentMember		  
Construction to Permanent [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Loans Receivable 9,988,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= pnbk_ConstructionToPermanentMember		 10,627,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= pnbk_ConstructionToPermanentMember		 12,718,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= pnbk_ConstructionToPermanentMember
Residential Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Performing and Accruing Loans [Member] | Pass [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 30,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables30To59DaysPastDueMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 172,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables30To59DaysPastDueMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Residential Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Performing and Accruing Loans [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 30,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables30To59DaysPastDueMember		 172,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables30To59DaysPastDueMember		  
Residential Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Performing and Accruing Loans [Member] | Pass [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 178,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables60To89DaysPastDueMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 87,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables60To89DaysPastDueMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Residential Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Performing and Accruing Loans [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 178,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables60To89DaysPastDueMember		 87,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables60To89DaysPastDueMember		  
Residential Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Performing and Accruing Loans [Member] | Pass [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 1,537,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 1,553,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Residential Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Performing and Accruing Loans [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 1,537,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember		 1,553,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember		  
Residential Portfolio Segment [Member] | Performing and Accruing Loans [Member] | Pass [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 1,745,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 1,812,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Current 100,396,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 106,012,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Total Loan Balances 102,141,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 107,824,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Total Loans Receivable 102,141,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 107,824,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Residential Portfolio Segment [Member] | Performing and Accruing Loans [Member] | Substandard [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Non-Accrual and Past Due Loans 380,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 719,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		  
Total Loans Receivable 380,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 719,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		  
Residential Portfolio Segment [Member] | Performing and Accruing Loans [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 1,745,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember		 1,812,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember		  
Current 100,396,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember		 106,012,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember		  
Total Loan Balances 102,141,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember		 107,824,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember		  
Total Non-Accrual and Past Due Loans 380,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember		 719,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember		  
Total Loans Receivable 102,521,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember		 108,543,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember		  
Residential Portfolio Segment [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Loans Receivable 102,521,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember		 108,543,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember		 103,766,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ResidentialPortfolioSegmentMember
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Performing and Accruing Loans [Member] | Pass [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 4,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables30To59DaysPastDueMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		    
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Performing and Accruing Loans [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 4,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables30To59DaysPastDueMember		    
Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Performing and Accruing Loans [Member] | Pass [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 99,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables60To89DaysPastDueMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 2,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables60To89DaysPastDueMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Performing and Accruing Loans [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 99,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables60To89DaysPastDueMember		 2,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables60To89DaysPastDueMember		  
Consumer Portfolio Segment [Member] | Performing and Accruing Loans [Member] | Pass [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 103,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 2,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Current 45,860,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 46,155,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Total Loan Balances 45,963,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 46,157,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Total Loans Receivable 45,963,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 46,157,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Consumer Portfolio Segment [Member] | Performing and Accruing Loans [Member] | Substandard [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Non-Accrual and Past Due Loans   7,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		  
Total Loans Receivable   7,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		  
Consumer Portfolio Segment [Member] | Performing and Accruing Loans [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 103,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember		 2,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember		  
Current 45,860,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember		 46,155,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember		  
Total Loan Balances 45,963,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember		 46,157,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember		  
Total Non-Accrual and Past Due Loans   7,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember		  
Total Loans Receivable 45,963,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember		 46,164,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember		  
Consumer Portfolio Segment [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Loans Receivable 45,963,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember		 46,164,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember		 47,347,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivablePortfolioSegmentAxis
= us-gaap_ConsumerPortfolioSegmentMember
Financing Receivables, 30 to 59 Days Past Due [Member] | Performing and Accruing Loans [Member] | Pass [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 74,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables30To59DaysPastDueMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 1,692,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables30To59DaysPastDueMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Financing Receivables, 30 to 59 Days Past Due [Member] | Performing and Accruing Loans [Member] | Special Mention [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 1,032,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables30To59DaysPastDueMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 1,041,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables30To59DaysPastDueMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		  
Financing Receivables, 30 to 59 Days Past Due [Member] | Performing and Accruing Loans [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 1,106,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables30To59DaysPastDueMember		 2,733,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables30To59DaysPastDueMember		  
Financing Receivables, 60 to 89 Days Past Due [Member] | Performing and Accruing Loans [Member] | Pass [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 277,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables60To89DaysPastDueMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 89,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables60To89DaysPastDueMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Financing Receivables, 60 to 89 Days Past Due [Member] | Performing and Accruing Loans [Member] | Substandard [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due   815,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables60To89DaysPastDueMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		  
Financing Receivables, 60 to 89 Days Past Due [Member] | Performing and Accruing Loans [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 277,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables60To89DaysPastDueMember		 904,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivables60To89DaysPastDueMember		  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Performing and Accruing Loans [Member] | Pass [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 1,537,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 1,832,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Performing and Accruing Loans [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 1,537,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember		 1,832,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember		  
Performing and Accruing Loans [Member] | Pass [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 1,888,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 3,613,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Current 481,956,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 460,301,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Total Loan Balances 483,844,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 463,914,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Total Loans Receivable 483,844,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 463,914,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Performing and Accruing Loans [Member] | Special Mention [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 1,032,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 1,041,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		  
Current 6,099,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 3,008,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		  
Total Loan Balances 7,131,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 4,049,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		  
Total Loans Receivable 7,131,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 4,049,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		  
Performing and Accruing Loans [Member] | Substandard [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due   815,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		  
Current 7,869,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 7,264,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		  
Total Loan Balances 7,869,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 8,079,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		  
Total Non-Accrual and Past Due Loans 515,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 866,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		  
Total Loans Receivable 8,384,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 8,945,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		  
Performing and Accruing Loans [Member]      
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Performing (Accruing) Loans [Line Items]      
Total Past due 2,920,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember		 5,469,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember		  
Current 495,924,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember		 470,573,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember		  
Total Loan Balances 498,844,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember		 476,042,000pnbk_PerformingLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember		  
Total Non-Accrual and Past Due Loans 515,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember		 866,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember		  
Total Loans Receivable $ 499,359,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember		 $ 476,908,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= pnbk_PerformingAndAccruingLoansMember