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Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details) [Line Items] |  |
Maturity of Federal Funds | 1 day |
Percentage of Possible Cumulative Change of Federal Reserve Bank Stock | 15.00%pnbk_PercentageOfPossibleCumulativeChangeOfFederalReserveBankStock |
Cumulative Change in Shares of Federal Reserve Bank Stock | 100 pnbk_CumulativeChangeInSharesOfFederalReserveBankStock |
Look-back Period | 2 years |
Deferred Tax Assets, Net of Valuation Allowance | $ 14,926,000 us-gaap_DeferredTaxAssetsNet | $ 0 us-gaap_DeferredTaxAssetsNet
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 14,900,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 0 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense |
Weighted Average Number Diluted Shares Outstanding Adjustment | 0 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 0 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member] |  |
Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details) [Line Items] |  |
Stock Value Par or Stated Value Per Share | $ 100 pnbk_StockValueParOrStatedValuePerShare / us-gaap_InvestmentTypeAxis = us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember |
Federal Reserve Bank Stock [Member] |  |
Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details) [Line Items] |  |
Stock Value Par or Stated Value Per Share | $ 100 pnbk_StockValueParOrStatedValuePerShare / us-gaap_InvestmentTypeAxis = pnbk_FederalReserveBankStockMember |
Earliest Tax Year [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details) [Line Items] |  |
Open Tax Year | 2010 |
Earliest Tax Year [Member] | State and Local Jurisdiction [Member] | CONNECTICUT |  |
Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details) [Line Items] |  |
Open Tax Year | 2010 |
Earliest Tax Year [Member] |  |
Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details) [Line Items] |  |
Income Tax Examination, Year under Examination, Completed |  | 2004
Latest Tax Year [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |
Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details) [Line Items] |  |
Open Tax Year | 2013 |
Latest Tax Year [Member] | State and Local Jurisdiction [Member] | CONNECTICUT |  |
Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details) [Line Items] |  |
Open Tax Year | 2013 |
Latest Tax Year [Member] |  |
Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details) [Line Items] |  |
Income Tax Examination, Year under Examination, Completed |  | 2009
Restricted Stock [Member] | Vesting Period One [Member] |  |
Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details) [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |
Restricted Stock [Member] | Vesting Period Two [Member] |  |
Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details) [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 4 years |
Restricted Stock [Member] | Vesting Period Three [Member] |  |
Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details) [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 5 years |
Minimum [Member] |  |
Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details) [Line Items] |  |
Property, Plant and Equipment, Useful Life | 3 years |
Maximum [Member] |  |
Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details) [Line Items] |  |
Property, Plant and Equipment, Useful Life | 40 years |
Internal Revenue Service (IRS) [Member] |  |
Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details) [Line Items] |  |
Income Tax Examination, Increase (Decrease) in Liability from Prior Year | $ 0 us-gaap_IncomeTaxExaminationIncreaseDecreaseInLiabilityFromPriorYear / us-gaap_IncomeTaxAuthorityNameAxis = us-gaap_InternalRevenueServiceIRSMember |
CONNECTICUT |  |
Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details) [Line Items] |  |
Number of Operating Branches | 7 pnbk_NumberOfOperatingBranches / us-gaap_StatementGeographicalAxis = stpr_CT |
NEW YORK |  |
Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details) [Line Items] |  |
Number of Operating Branches | 2 pnbk_NumberOfOperatingBranches / us-gaap_StatementGeographicalAxis = stpr_NY |

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