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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) | 3,360,000 us-gaap_StockIssuedDuringPeriodSharesAcquisitions |  |  |  |  |  |
Stock Issued During Period at Purchase Price Per Share Acquisition (in Dollars per share) | $ 15.00 pnbk_StockIssuedDuringPeriodAtPurchasePricePerShareAcquisition |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions (in Dollars) | $ 50.4 us-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) | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | [1] | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | [1] |  |
Common Stock, Shares Authorized (in Shares) | 100,000,000 us-gaap_CommonStockSharesAuthorized | 100,000,000 us-gaap_CommonStockSharesAuthorized | [1] | 100,000,000 us-gaap_CommonStockSharesAuthorized | [1] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in Shares) |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  |  |  |  |
Number of Dilutive Securities Stock |  | 0 pnbk_NumberOfDilutiveSecuritiesStock |  | 0 pnbk_NumberOfDilutiveSecuritiesStock |  | 0 pnbk_NumberOfDilutiveSecuritiesStock |
Subsequent Event [Member] | Reverse Stock Split [Member] |  |  |  |  |  |  |
Note 13 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  |  |  |  |  |  | 10 us-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 |  | 10 us-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.

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