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Note 17 - Related Party Transactions (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Related Party Transactions [Abstract]    
Percentage of Related Party Ownership in Other Entities for Grant of Loan 10.00%pnbk_PercentageOfRelatedPartyOwnershipInOtherEntitiesForGrantOfLoan  
Loans and Leases Receivable, Related Parties $ 100us-gaap_LoansAndLeasesReceivableRelatedParties $ 100us-gaap_LoansAndLeasesReceivableRelatedParties
Related Party Deposit Liabilities 2,800,000us-gaap_RelatedPartyDepositLiabilities 3,000,000us-gaap_RelatedPartyDepositLiabilities
Related Party Costs 0us-gaap_RelatedPartyCosts 0us-gaap_RelatedPartyCosts
Due from Affiliates $ 500us-gaap_DueFromAffiliates $ 500us-gaap_DueFromAffiliates