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Note 2 - Investment Securities (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Note 2 - Investment Securities (Details) [Line Items] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 10 us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1 | 11 us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
Unrealized Holding Losses Depreciation Percentage from Amortized Cost | 0.60%pnbk_UnrealizedHoldingLossesDepreciationPercentageFromAmortizedCost | 1.30%pnbk_UnrealizedHoldingLossesDepreciationPercentageFromAmortizedCost
Municipal Deposits Securities [Member] |  |
Note 2 - Investment Securities (Details) [Line Items] |  |
Available-for-sale Securities Pledged as Collateral (in Dollars) | 6.8 us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pnbk_MunicipalDepositsSecuritiesMember | 7.4 us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pnbk_MunicipalDepositsSecuritiesMember

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- Definition Unrealized holding losses depreciation percentage from amortized cost. + References No definition available. + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5086-111524 + Details
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