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Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Non-Accrual Loans and Past Due Matured Loans (Non-Accrual and Past Due Loans [Member], USD $)	Mar. 31, 2015	Dec. 31, 2014
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Non-Accrual Loans and Past Due Matured Loans [Line Items]
Non Accrual Loans- Past dues	$ 380,000us-gaap_FinancingReceivableRecordedInvestmentPastDue	$ 728,000us-gaap_FinancingReceivableRecordedInvestmentPastDue
Non-Accrual Loans, Current	135,000us-gaap_FinancingReceivableRecordedInvestmentCurrent	138,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
Total Non Accrual Loans	515,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus	866,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Non-Accrual Loans and Past Due Matured Loans [Line Items]
Non-Accrual Loans, Current	135,000us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember	138,000us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Total Non Accrual Loans	135,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember	138,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Commercial Real Estate Portfolio Segment [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Non-Accrual Loans and Past Due Matured Loans [Line Items]
Non-Accrual Loans, Current	135,000us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	138,000us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Total Non Accrual Loans	135,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	138,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Residential Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Non-Accrual Loans and Past Due Matured Loans [Line Items]
Non Accrual Loans- Past dues	380,000us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember	719,000us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Residential Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Non-Accrual Loans and Past Due Matured Loans [Line Items]
Non Accrual Loans- Past dues	380,000us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember	719,000us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Residential Portfolio Segment [Member] | Substandard [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Non-Accrual Loans and Past Due Matured Loans [Line Items]
Non Accrual Loans- Past dues	380,000us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember	719,000us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Total Non Accrual Loans	380,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember	719,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Residential Portfolio Segment [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Non-Accrual Loans and Past Due Matured Loans [Line Items]
Non Accrual Loans- Past dues	380,000us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember	719,000us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember
Total Non Accrual Loans	380,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember	719,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialPortfolioSegmentMember
Commercial Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Non-Accrual Loans and Past Due Matured Loans [Line Items]
Non Accrual Loans- Past dues		2,000us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Commercial Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Non-Accrual Loans and Past Due Matured Loans [Line Items]
Non Accrual Loans- Past dues		2,000us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Commercial Portfolio Segment [Member] | Substandard [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Non-Accrual Loans and Past Due Matured Loans [Line Items]
Non Accrual Loans- Past dues		2,000us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Total Non Accrual Loans		2,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Commercial Portfolio Segment [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Non-Accrual Loans and Past Due Matured Loans [Line Items]
Non Accrual Loans- Past dues		2,000us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialPortfolioSegmentMember
Total Non Accrual Loans		2,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialPortfolioSegmentMember
Consumer Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Non-Accrual Loans and Past Due Matured Loans [Line Items]
Non Accrual Loans- Past dues		7,000us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Consumer Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Non-Accrual Loans and Past Due Matured Loans [Line Items]
Non Accrual Loans- Past dues		7,000us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Consumer Portfolio Segment [Member] | Substandard [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Non-Accrual Loans and Past Due Matured Loans [Line Items]
Non Accrual Loans- Past dues		7,000us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Total Non Accrual Loans		7,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Consumer Portfolio Segment [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Non-Accrual Loans and Past Due Matured Loans [Line Items]
Non Accrual Loans- Past dues		7,000us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ConsumerPortfolioSegmentMember
Total Non Accrual Loans		7,000pnbk_FinancingReceivableRecordedInvestmentPastDuesAndNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ConsumerPortfolioSegmentMember
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) - Delinquency Status of Non-Accrual Loans and Past Due Matured Loans [Line Items]
Non Accrual Loans- Past dues	$ 380,000us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember	$ 728,000us-gaap_FinancingReceivableRecordedInvestmentPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualAndPastDueLoansMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember

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Financing receivables that are current.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 310

-SubTopic 10

-Section 50

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+ References

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-Topic 310

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