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Note 3 - Loans Receivable and Allowance for Loan Losses (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items] |  |  |
Maximum Period of Credit Extension of Construction Loans | 18 months |  |
Period for Charged Off of Open-End Credits | 180 days |  |
Period for Charged Off of Close-End Credits | 120 days |  |
Recorded Balance of Non-Accrual Loans | $ 515,000 pnbk_RecordedBalanceOfNonAccrualLoans |  | $ 866,000 pnbk_RecordedBalanceOfNonAccrualLoans
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans | 4,000 us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans | 33,000 us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans |
Maximum Period for Charged Off of Consumer Installment Loans | 90 days |  |
Performance Period Under Loan Terms |  |  | 6 months
Percent of NonAccruing Loan Balance | 26.00%pnbk_PercentOfNonAccruingLoanBalance |  |
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing | 1,500,000 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing |  | 1,800,000 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Impaired Financing Receivable, Recorded Investment | 12,230,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment |  | 11,724,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment |  | 7,000 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 12,230,000 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment |  | 11,717,000 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
Financing Receivable Modifications Number of Contracts During Period | 0 pnbk_FinancingReceivableModificationsNumberOfContractsDuringPeriod |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential Mortgage [Member] |  |  |
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items] |  |  |
Number of Accruing Loans |  |  | 1 pnbk_NumberOfAccruingLoans / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_ResidentialMortgageMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Line of Credit [Member] |  |  |
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items] |  |  |
Number of Accruing Loans |  |  | 4 pnbk_NumberOfAccruingLoans / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |  |
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items] |  |  |
Number of Accruing Loans | 1 pnbk_NumberOfAccruingLoans / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember |  | 5 pnbk_NumberOfAccruingLoans / us-gaap_FinancingReceivablesPeriodPastDueAxis = us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Commercial Portfolio Segment [Member] |  |  |
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items] |  |  |
Maximum Percentage of Credit Extension Based on Market Value of Collateral | 75.00%pnbk_MaximumPercentageOfCreditExtensionBasedOnMarketValueOfCollateral / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialPortfolioSegmentMember |  |
Impaired Financing Receivable, Recorded Investment |  |  | 2,000 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialPortfolioSegmentMember
Impaired Financing Receivable, with No Related Allowance, Recorded Investment |  |  | 2,000 us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment / us-gaap_FinancingReceivablePortfolioSegmentAxis = us-gaap_CommercialPortfolioSegmentMember
Multi-family Real Estate [Member] |  |  |
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items] |  |  |
Maximum Percentage of Credit Extension Based on Market Value of Collateral | 80.00%pnbk_MaximumPercentageOfCreditExtensionBasedOnMarketValueOfCollateral / us-gaap_FinancingReceivablePortfolioSegmentAxis = pnbk_MultiFamilyRealEstateMember |  |
Construction to Permanent [Member] |  |  |
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items] |  |  |
Percentage of Maximum Loan to Value | 75.00%pnbk_PercentageOfMaximumLoanToValue / us-gaap_FinancingReceivablePortfolioSegmentAxis = pnbk_ConstructionToPermanentMember |  |
Residential Mortgage [Member] |  |  |
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items] |  |  |
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing |  |  | 1,600,000 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember
Non-Accrual Loans [Member] |  |  |
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items] |  |  |
Financing Receivable, Recorded Investment, Current | 135,000 us-gaap_FinancingReceivableRecordedInvestmentCurrent / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = pnbk_NonAccrualLoansMember |  |
Line of Credit [Member] |  |  |
Note 3 - Loans Receivable and Allowance for Loan Losses (Details) [Line Items] |  |  |
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing |  |  | $ 279,000 us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember

X
- Definition Financing receivable modifications number of contracts during period. + References No definition available. + Details
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- Definition Maximum percentage of credit extension based on market value of collateral. + References No definition available. + Details
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- Definition Maximum period for charged off of consumer installment loans. + References No definition available. + Details
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- Definition Maximum period of credit extension of construction loans. + References No definition available. + Details
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- Definition Number of accruing loans. + References No definition available. + Details
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- Definition Percentage of maximum loan to value. + References No definition available. + Details
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- Definition The percentage of non-accruing loan balance which is current. + References No definition available. + Details
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- Definition Performance period under loan terms. + References No definition available. + Details
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- Definition Period for charged off of close end credits. + References No definition available. + Details
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- Definition Period for charged off of open end credits + References No definition available. + Details
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- Definition Recorded balance of non accrual loans. + References No definition available. + Details
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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5111-111524 + Details
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- Definition Financing receivables that are current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953401-111524 + Details
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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953550-111524 + Details
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- Definition Amount of investment in impaired financing receivables for which there is no related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953550-111524 + Details
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- Definition Amount of investment in impaired financing receivables for which there is a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953550-111524 + Details
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- Definition Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18794-111554 + Details
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