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Note 4 - Loans Receivable and Allowance for Loan Losses (Details) - Credit Risk Exposure of Loans Receivable, by Loan Type and Credit Quality Indicator (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Internal Risk Rating |  |
Loans receivable | $ 476,908 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | $ 423,829 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Commercial Portfolio Segment [Member] | Pass [Member] | Loan to Value Ratio Less than 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 41,200 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember | 23,671 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember
Commercial Portfolio Segment [Member] | Pass [Member] | Loan to Value Ratio Greater than or Equal to 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 6,878 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember | 3,868 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember
Commercial Portfolio Segment [Member] | Special Mention [Member] | Loan to Value Ratio Less than 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 121 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember | 170 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember
Commercial Portfolio Segment [Member] | Substandard [Member] | Loan to Value Ratio Less than 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 5,774 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember | 7,428 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember
Commercial Portfolio Segment [Member] | Loan to Value Ratio Less than 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 47,095 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember | 31,269 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember
Commercial Portfolio Segment [Member] | Loan to Value Ratio Greater than or Equal to 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 6,878 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember | 3,868 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember
Commercial Portfolio Segment [Member] |  |
Internal Risk Rating |  |
Loans receivable | 53,973 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 35,137 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Loan to Value Ratio Less than 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 240,926 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember | 198,787 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Loan to Value Ratio Greater than or Equal to 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 7,206 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember | 7,940 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Loan to Value Ratio Less than 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 1,945 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember | 6,551 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Loan to Value Ratio Greater than or Equal to 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 1,983 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember | 2,496 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Loan to Value Ratio Less than 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 2,445 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember | 3,684 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Loan to Value Ratio Greater than or Equal to 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable |  | 3,314 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember
Commercial Real Estate Portfolio Segment [Member] | Loan to Value Ratio Less than 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 245,316 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember | 209,022 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember
Commercial Real Estate Portfolio Segment [Member] | Loan to Value Ratio Greater than or Equal to 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 9,189 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember | 13,750 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember
Commercial Real Estate Portfolio Segment [Member] |  |
Internal Risk Rating |  |
Loans receivable | 254,505 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 222,772 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Real Estate Construction [Member] | Pass [Member] | Loan to Value Ratio Less than 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 2,936 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember |
Real Estate Construction [Member] | Pass [Member] | Loan to Value Ratio Greater than or Equal to 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 160 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember |
Real Estate Construction [Member] | Substandard [Member] | Loan to Value Ratio Less than 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable |  | 60 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember
Real Estate Construction [Member] | Substandard [Member] | Loan to Value Ratio Greater than or Equal to 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable |  | 200 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember
Real Estate Construction [Member] | Loan to Value Ratio Less than 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 2,936 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember | 60 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember
Real Estate Construction [Member] | Loan to Value Ratio Greater than or Equal to 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 160 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember | 200 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember
Real Estate Construction [Member] |  |
Internal Risk Rating |  |
Loans receivable | 3,096 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionMember | 260 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionMember
Real Estate Construction to Permanent [Member] | Pass [Member] | Loan to Value Ratio Less than 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 10,627 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionToPermanentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember | 10,183 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionToPermanentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember
Real Estate Construction to Permanent [Member] | Substandard [Member] | Loan to Value Ratio Less than 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable |  | 1,189 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionToPermanentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember
Real Estate Construction to Permanent [Member] | Loan to Value Ratio Less than 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 10,627 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionToPermanentMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember | 11,372 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionToPermanentMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember
Real Estate Construction to Permanent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 10,627 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionToPermanentMember | 11,372 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = pnbk_RealEstateConstructionToPermanentMember
Residential Portfolio Segment [Member] | Pass [Member] | Loan to Value Ratio Less than 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 93,238 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember | 83,252 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember
Residential Portfolio Segment [Member] | Pass [Member] | Loan to Value Ratio Greater than or Equal to 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 14,586 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember | 20,778 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember
Residential Portfolio Segment [Member] | Substandard [Member] | Loan to Value Ratio Less than 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 339 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember | 1,981 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember
Residential Portfolio Segment [Member] | Substandard [Member] | Loan to Value Ratio Greater than or Equal to 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 380 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember | 957 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember
Residential Portfolio Segment [Member] | Loan to Value Ratio Less than 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 93,577 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember | 85,233 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember
Residential Portfolio Segment [Member] | Loan to Value Ratio Greater than or Equal to 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 14,966 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember | 21,735 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember
Residential Portfolio Segment [Member] |  |
Internal Risk Rating |  |
Loans receivable | 108,543 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 106,968 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Consumer Portfolio Segment [Member] | Pass [Member] | Loan to Value Ratio Less than 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 43,820 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember | 42,780 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember
Consumer Portfolio Segment [Member] | Pass [Member] | Loan to Value Ratio Greater than or Equal to 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 1,627 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember | 3,849 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember
Consumer Portfolio Segment [Member] | Pass [Member] | Other LTV [Member] |  |
Internal Risk Rating |  |
Loans receivable | 710 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_RangeAxis = pnbk_OtherLTVMember | 650 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember / us-gaap_RangeAxis = pnbk_OtherLTVMember
Consumer Portfolio Segment [Member] | Substandard [Member] | Loan to Value Ratio Less than 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 7 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember | 10 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember
Consumer Portfolio Segment [Member] | Substandard [Member] | Loan to Value Ratio Greater than or Equal to 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable |  | 31 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember
Consumer Portfolio Segment [Member] | Loan to Value Ratio Less than 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 43,827 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember | 42,790 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioLessThan75PercentMember
Consumer Portfolio Segment [Member] | Loan to Value Ratio Greater than or Equal to 75 Percent [Member] |  |
Internal Risk Rating |  |
Loans receivable | 1,627 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember | 3,880 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_RangeAxis = pnbk_LoanToValueRatioGreaterThanOrEqualTo75PercentMember
Consumer Portfolio Segment [Member] | Other LTV [Member] |  |
Internal Risk Rating |  |
Loans receivable | 710 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_RangeAxis = pnbk_OtherLTVMember | 650 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember / us-gaap_RangeAxis = pnbk_OtherLTVMember
Consumer Portfolio Segment [Member] |  |
Internal Risk Rating |  |
Loans receivable | 46,164 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | 47,320 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Pass [Member] |  |
Internal Risk Rating |  |
Loans receivable | 463,914 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember | 395,758 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember
Special Mention [Member] |  |
Internal Risk Rating |  |
Loans receivable | 4,049 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember | 9,217 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember
Substandard [Member] |  |
Internal Risk Rating |  |
Loans receivable | $ 8,945 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | $ 18,854 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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