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Note 4 - Loans Receivable and Allowance for Loan Losses (Details) - Loans Modified in a Troubled Debt Restructuring (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Note 4 - Loans Receivable and Allowance for Loan Losses (Details) - Loans Modified in a Troubled Debt Restructuring [Line Items] |  |
Number of Relationships | 2 pnbk_FinancingReceivablePreModificationNumberOfContracts | 2 pnbk_FinancingReceivablePreModificationNumberOfContracts
Pre-Modification Outstanding Recorded Investment | $ 2,439 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 | $ 4,730 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Number of Relationships | 2 pnbk_FinancingReceivablePostModificationNumberOfContracts | 1 pnbk_FinancingReceivablePostModificationNumberOfContracts
Post-Modification Outstanding Recorded Investment | 2,430 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 | 991 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Commercial Real Estate Portfolio Segment [Member] |  |
Note 4 - Loans Receivable and Allowance for Loan Losses (Details) - Loans Modified in a Troubled Debt Restructuring [Line Items] |  |
Number of Relationships | 2 pnbk_FinancingReceivablePreModificationNumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |
Pre-Modification Outstanding Recorded Investment | 2,439 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |
Number of Relationships | 2 pnbk_FinancingReceivablePostModificationNumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |
Post-Modification Outstanding Recorded Investment | 2,430 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |
Real Estate Construction to Permanent [Member] |  |
Note 4 - Loans Receivable and Allowance for Loan Losses (Details) - Loans Modified in a Troubled Debt Restructuring [Line Items] |  |
Number of Relationships |  | 2 pnbk_FinancingReceivablePreModificationNumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionToPermanentMember
Pre-Modification Outstanding Recorded Investment |  | 4,730 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionToPermanentMember
Number of Relationships |  | 1 pnbk_FinancingReceivablePostModificationNumberOfContracts / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionToPermanentMember
Post-Modification Outstanding Recorded Investment |  | $ 991 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionToPermanentMember

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- Definition Financing receivable post modification number of contracts. + References No definition available. + Details
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- Definition Financing receivable pre modification number of contracts. + References No definition available. + Details
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- Definition Post-modification amount of investment in financing receivables 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 Pre-modification amount of investment in financing receivables 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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