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Note 11 - Fair Value and Interest Rate Risk (Details) - Financial Assets Measured at Fair Value on a Non-Recurring Basis (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Note 11 - Fair Value and Interest Rate Risk (Details) - Financial Assets Measured at Fair Value on a Non-Recurring Basis [Line Items] |  |
Impaired loans | $ 12,230 us-gaap_ImpairedFinancingReceivableRecordedInvestment | $ 11,724 us-gaap_ImpairedFinancingReceivableRecordedInvestment
Impaired Loans [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Note 11 - Fair Value and Interest Rate Risk (Details) - Financial Assets Measured at Fair Value on a Non-Recurring Basis [Line Items] |  |
Impaired loans | 535 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pnbk_ImpairedLoansMember | 859 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pnbk_ImpairedLoansMember
Impaired Loans [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |
Note 11 - Fair Value and Interest Rate Risk (Details) - Financial Assets Measured at Fair Value on a Non-Recurring Basis [Line Items] |  |
Impaired loans | $ 535 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pnbk_ImpairedLoansMember | $ 859 us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pnbk_ImpairedLoansMember

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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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