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Note 3 - Available-for-Sale Securities (Details) (USD $)	12 Months Ended
	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	11us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1	11us-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	$ 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
Proceeds from Sale of Available-for-sale Securities	0us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities	0us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities	45,200,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Available-for-sale Securities, Gross Realized Gains			911,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Municipal Deposits Securities [Member]
Note 3 - Available-for-Sale Securities (Details) [Line Items]
Available-for-sale Securities Pledged as Collateral	$ 4,400,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = pnbk_MunicipalDepositsSecuritiesMember	$ 5,800,000us-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

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

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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=35738203&loc=d3e5086-111524

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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

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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



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 45

-Paragraph 12

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