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Note 10 - Income Taxes (Details) - Tax Effects of Temporary Differences (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets:
Allowance for loan losses	$ 1,918us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	$ 2,213us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	$ 2,343us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses
Nonaccrual interest	1,508us-gaap_DeferredTaxAssetsTaxDeferredExpense	1,474us-gaap_DeferredTaxAssetsTaxDeferredExpense	1,325us-gaap_DeferredTaxAssetsTaxDeferredExpense
Depriciation of premises and equipment	523us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment	1,276us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment	1,074us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Accrued expenses	292us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	376us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	225us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Share-based Compensation			72us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
OREO Writedowns	63pnbk_DeferredTaxAssetsOREOWritedowns
Capital loss carryover	572us-gaap_DeferredTaxAssetsCapitalLossCarryforwards	572us-gaap_DeferredTaxAssetsCapitalLossCarryforwards	572us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
State NOL carryforward benefit	3,435us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	3,613us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	3,237us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Federal NOL carryforward benefit	17,372us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic	18,427us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic	15,850us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
NOL write-off for § 382 Limitation	(10,382)pnbk_DeferredTaxAssetsOperatingLossCarryforwardsWriteOff	(10,382)pnbk_DeferredTaxAssetsOperatingLossCarryforwardsWriteOff	(10,382)pnbk_DeferredTaxAssetsOperatingLossCarryforwardsWriteOff
Federal AMT benefit estimate			318us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsContingencies
Unrealized loss AFS	176us-gaap_DeferredTaxAssetsUnrealizedLossesOnTradingSecurities	462us-gaap_DeferredTaxAssetsUnrealizedLossesOnTradingSecurities	251us-gaap_DeferredTaxAssetsUnrealizedLossesOnTradingSecurities
Other	21us-gaap_DeferredTaxAssetsOther	37us-gaap_DeferredTaxAssetsOther	154us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets	15,498us-gaap_DeferredTaxAssetsGross	18,068us-gaap_DeferredTaxAssetsGross	15,039us-gaap_DeferredTaxAssetsGross
Valuation allowance	(572)us-gaap_DeferredTaxAssetsValuationAllowance	(18,068)us-gaap_DeferredTaxAssetsValuationAllowance	(15,039)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets, net of valuation allowance	14,926us-gaap_DeferredTaxAssetsNet	0us-gaap_DeferredTaxAssetsNet
Deferred tax asset, net	$ 14,926us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 18,100us-gaap_DeferredTaxAssetsLiabilitiesNet

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