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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 100pnbk_CumulativeChangeInSharesOfFederalReserveBankStock  
Look-back Period 2 years  
Deferred Tax Assets, Net of Valuation Allowance $ 14,926,000us-gaap_DeferredTaxAssetsNet $ 0us-gaap_DeferredTaxAssetsNet
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 14,900,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense  
Weighted Average Number Diluted Shares Outstanding Adjustment 0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 0us-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 $ 100pnbk_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 $ 100pnbk_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 $ 0us-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 7pnbk_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 2pnbk_NumberOfOperatingBranches
/ us-gaap_StatementGeographicalAxis
= stpr_NY