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2. Investment securities, Contractual Maturity (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Amortized Cost    
Due within one year $ 4,308us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Due from one to five years 40,564us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
Due from five to ten years 117,452us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost  
Due after ten years 20,599us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost  
Mortgage-backed securities 88,496PEBK_Available-For-SaleSecuritiesDebtMaturitiesMortgage-BackedSecuritiesAmortizedCost  
Equity securities 748PEBK_Available-For-SaleSecuritiesDebtMaturitiesEquitySecuritiesAmortizedCost  
Total 272,167us-gaap_AvailableForSaleSecuritiesAmortizedCost 299,809us-gaap_AvailableForSaleSecuritiesAmortizedCost
Estimated Fair Value    
Due within one year 4,323us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Due from one to five years 42,548us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Due from five to ten years 121,399us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Due after ten years 21,241us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue  
Mortgage-backed securities 90,210PEBK_Available-For-SaleSecuritiesDebtMaturitiesMortgage-BackedSecuritiesFairValue  
Equity securities 1,378PEBK_Available-For-SaleSecuritiesDebtMaturitiesEquitySecuritiesFairValue  
Total $ 281,099us-gaap_AvailableForSaleSecuritiesDebtSecurities