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Note 4 - Loans Receivable and Allowance for Loan Losses (Details) - Troubled Debt Restructured Loans (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Financing Receivable, Modifications [Line Items] |  |
Number of loans | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 2 us-gaap_FinancingReceivableModificationsNumberOfContracts2
Troubled debt restructured loan amount | $ 1,131,000 us-gaap_FinancingReceivableModificationsRecordedInvestment | $ 2,188,000 us-gaap_FinancingReceivableModificationsRecordedInvestment
Accrual and Past Due Loans [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of loans | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = pnbk_AccrualAndPastDueLoansMember | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = pnbk_AccrualAndPastDueLoansMember
Troubled debt restructured loan amount | 1,131,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = pnbk_AccrualAndPastDueLoansMember | 991,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = pnbk_AccrualAndPastDueLoansMember
Accrual and Past Due Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of loans | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = pnbk_AccrualAndPastDueLoansMember | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = pnbk_AccrualAndPastDueLoansMember
Troubled debt restructured loan amount | 1,131,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = pnbk_AccrualAndPastDueLoansMember | 991,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = pnbk_AccrualAndPastDueLoansMember
Non-Accrual Loans [Member] | Real Estate Construction to Permanent [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of loans |  | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionToPermanentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = pnbk_NonAccrualLoansMember
Troubled debt restructured loan amount |  | 1,197,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionToPermanentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = pnbk_NonAccrualLoansMember
Non-Accrual Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of loans |  | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = pnbk_NonAccrualLoansMember
Troubled debt restructured loan amount |  | 1,197,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = pnbk_NonAccrualLoansMember
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of loans | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Troubled debt restructured loan amount | 1,131,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 991,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Real Estate Construction to Permanent [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of loans |  | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionToPermanentMember
Troubled debt restructured loan amount |  | $ 1,197,000 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionToPermanentMember

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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