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Note 13 - Shareholders' Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 12 Months Ended 0 Months Ended
Oct. 15, 2010
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 04, 2015
Note 13 - Shareholders' Equity (Details) [Line Items]          
Stock Issued During Period, Shares, Acquisitions (in Shares) 3,360,000us-gaap_StockIssuedDuringPeriodSharesAcquisitions        
Stock Issued During Period at Purchase Price Per Share Acquisition (in Dollars per share) $ 15.00pnbk_StockIssuedDuringPeriodAtPurchasePricePerShareAcquisition        
Stock Issued During Period, Value, Acquisitions (in Dollars) $ 50.4us-gaap_StockIssuedDuringPeriodValueAcquisitions        
Percentage of Shares Sold of Common Stock Issued and Outstanding 87.60%pnbk_PercentageOfSharesSoldOfCommonStockIssuedAndOutStanding        
Common Stock, Par or Stated Value Per Share (in Dollars per share) $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare [1] $ 0.01us-gaap_CommonStockParOrStatedValuePerShare [1]    
Common Stock, Shares Authorized (in Shares) 100,000,000us-gaap_CommonStockSharesAuthorized 100,000,000us-gaap_CommonStockSharesAuthorized [1] 100,000,000us-gaap_CommonStockSharesAuthorized [1]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in Shares)   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber      
Number of Dilutive Securities Stock   0pnbk_NumberOfDilutiveSecuritiesStock 0pnbk_NumberOfDilutiveSecuritiesStock 0pnbk_NumberOfDilutiveSecuritiesStock  
Subsequent Event [Member] | Reverse Stock Split [Member]          
Note 13 - Shareholders' Equity (Details) [Line Items]          
Stockholders' Equity Note, Stock Split, Conversion Ratio         10us-gaap_StockholdersEquityNoteStockSplitConversionRatio1
/ us-gaap_NonmonetaryTransactionTypeAxis
= pnbk_ReverseStockSplitMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Reverse Stock Split [Member]          
Note 13 - Shareholders' Equity (Details) [Line Items]          
Stockholders' Equity Note, Stock Split, Conversion Ratio   10us-gaap_StockholdersEquityNoteStockSplitConversionRatio1
/ us-gaap_NonmonetaryTransactionTypeAxis
= pnbk_ReverseStockSplitMember		      
[1] On March 4, 2015, the Company affected a 1-for-10 reverse stock split. All common stock data included in these financial statements has been restated to give effect to the reverse stock split.