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Note 8 - Borrowings (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2014
Dec. 31, 2003
Note 8 - Borrowings (Details) [Line Items]        
Proceeds from Federal Home Loan Bank Advances   $ 50,000,000us-gaap_ProceedsFromFederalHomeLoanBankAdvances    
Restructured Federal Home Loan Bank Advances   10,000,000pnbk_RestructuredFederalHomeLoanBankAdvances    
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate   2.19%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate    
Number of Years of Maturity Period Extended   1 year    
Advances from Federal Home Loan Banks 120,000,000us-gaap_AdvancesFromFederalHomeLoanBanks 57,000,000us-gaap_AdvancesFromFederalHomeLoanBanks    
Preferred Stock, Shares Issued (in Shares) 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued    
Derivative, Variable Interest Rate 3.40%us-gaap_DerivativeVariableInterestRate      
Number of Consecutive Quarters for Interest Deferment 20pnbk_NumberOfConsecutiveQuartersForInterestDeferment      
Interest Payable 147,000us-gaap_InterestPayableCurrentAndNoncurrent   1,600,000us-gaap_InterestPayableCurrentAndNoncurrent  
Number of Years of Duration of Trust 30pnbk_NumberOfYearsOfDurationOfTrust      
Federal Home Loan Bank Borrowings [Member] | Minimum [Member]        
Note 8 - Borrowings (Details) [Line Items]        
Federal Home Loan Bank Borrowings Interest Rate   0.77%pnbk_FederalHomeLoanBankBorrowingsInterestRate
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_FederalHomeLoanBankBorrowingsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Federal Home Loan Bank Borrowings [Member] | Maximum [Member]        
Note 8 - Borrowings (Details) [Line Items]        
Federal Home Loan Bank Borrowings Interest Rate   3.69%pnbk_FederalHomeLoanBankBorrowingsInterestRate
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_FederalHomeLoanBankBorrowingsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Federal Home Loan Bank Borrowings [Member]        
Note 8 - Borrowings (Details) [Line Items]        
Long Term Debt Additional Available Amount 27,800,000pnbk_LongTermDebtAdditionalAvailableAmount
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_FederalHomeLoanBankBorrowingsMember
     
Line of Credit Facility, Maximum Borrowing Capacity 2,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_FederalHomeLoanBankBorrowingsMember
     
Long-term Line of Credit 0us-gaap_LineOfCredit
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_FederalHomeLoanBankBorrowingsMember
0us-gaap_LineOfCredit
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_FederalHomeLoanBankBorrowingsMember
   
Unsecured Debt [Member] | Trust [Member]        
Note 8 - Borrowings (Details) [Line Items]        
Subordinated Debt $ 8,200,000us-gaap_SubordinatedDebt
/ dei_LegalEntityAxis
= pnbk_TrustMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
     
London Interbank Offered Rate (LIBOR) [Member]        
Note 8 - Borrowings (Details) [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 3.15%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
     
Trust [Member]        
Note 8 - Borrowings (Details) [Line Items]        
Noncontrolling Interest, Ownership Percentage by Parent       100.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ dei_LegalEntityAxis
= pnbk_TrustMember
Preferred Stock, Shares Issued (in Shares)       8,000,000us-gaap_PreferredStockSharesIssued
/ dei_LegalEntityAxis
= pnbk_TrustMember
Excess Tier One Risk Based Capital to Risk Weighted Assets       25.00%us-gaap_ExcessTierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= pnbk_TrustMember