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Note 3 - Available-for-Sale Securities (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 3 - Available-for-Sale Securities (Details) [Line Items] |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 11 us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1 | 11 us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1 |
Unrealized Holding Losses Depreciation Percentage from Amortized Cost | 1.30%pnbk_UnrealizedHoldingLossesDepreciationPercentageFromAmortizedCost | 3.20%pnbk_UnrealizedHoldingLossesDepreciationPercentageFromAmortizedCost |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities | $ 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities |  |
Proceeds from Sale of Available-for-sale Securities | 0 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 0 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 45,200,000 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Available-for-sale Securities, Gross Realized Gains |  |  | 911,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Municipal Deposits Securities [Member] |  |  |
Note 3 - Available-for-Sale Securities (Details) [Line Items] |  |  |
Available-for-sale Securities Pledged as Collateral | $ 4,400,000 us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pnbk_MunicipalDepositsSecuritiesMember | $ 5,800,000 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 This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + 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=35738203&loc=d3e5086-111524 + Details
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- Definition The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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