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Note 19 - Fair Value and Interest Rate Risk (Details) - Financial Assets Measured at Fair Value on a Non-Recurring Basis (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Note 19 - Fair Value and Interest Rate Risk (Details) - Financial Assets Measured at Fair Value on a Non-Recurring Basis [Line Items]
Non-accrual loans	$ 11,724us-gaap_ImpairedFinancingReceivableRecordedInvestment	$ 22,021us-gaap_ImpairedFinancingReceivableRecordedInvestment
Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Note 19 - Fair Value and Interest Rate Risk (Details) - Financial Assets Measured at Fair Value on a Non-Recurring Basis [Line Items]
Non-accrual loans	859us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pnbk_ImpairedLoansMember	10,446us-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 19 - Fair Value and Interest Rate Risk (Details) - Financial Assets Measured at Fair Value on a Non-Recurring Basis [Line Items]
Non-accrual loans	$ 859us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pnbk_ImpairedLoansMember	$ 10,446us-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=35738203&loc=SL6953550-111524

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