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Note 10 - Income Taxes (Details) - Reconciliation of the Anticipated Income Tax Benefit (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of the Anticipated Income Tax Benefit [Abstract]
statutory Federal rate	$ 326us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ (2,593)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ (182)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State taxes, net of Federal benefit	48us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	(21)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Nondeductible expenses	175us-gaap_IncomeTaxReconciliationNondeductibleExpense	6us-gaap_IncomeTaxReconciliationNondeductibleExpense	5us-gaap_IncomeTaxReconciliationNondeductibleExpense
Change in cash surrender value of life insurance		(178)pnbk_IncomeTaxReconciliationChangeInCashSurrenderValueOfLifeInsurance	(176)pnbk_IncomeTaxReconciliationChangeInCashSurrenderValueOfLifeInsurance
Taxes on BOLI income	1,701us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance
Valuation allowance	(16,812)us-gaap_IncomeTaxReconciliationOtherAdjustments
Tangible Property Review IRC Sec 481(a)	(644)pnbk_IncomeTaxReconciliationTangiblePropertyReview
Current Year Change in valuation allowance	(39)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	2,447us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	329us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other	495us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther		24us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
Total benefit for income taxes	$ (14,750)us-gaap_IncomeTaxExpenseBenefit	$ (339)us-gaap_IncomeTaxExpenseBenefit

X

- Definition

Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to cash surrender value of life insurance.

+ References

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the tangible property review as outlined in IRC Sec 481(a).

+ References

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- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h))

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-Number 210

-Section 08

-Paragraph h

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Glossary Income Tax Expense (or Benefit)

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible life insurance expense.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other nondeductible expenses.

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