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Note 2 - Investment Securities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Note 2 - Investment Securities (Details) [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	10us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1	11us-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)	6.8us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pnbk_MunicipalDepositsSecuritiesMember	7.4us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pnbk_MunicipalDepositsSecuritiesMember

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- Definition

Unrealized holding losses depreciation percentage from amortized cost.

+ References

No definition available.

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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

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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

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