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2. Investment securities, Contractual Maturity (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Amortized Cost    
Due within one year $ 4,399us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Due from one to five years 50,121us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
Due from five to ten years 111,462us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost  
Due after ten years 19,270us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost  
Mortgage-backed securities 86,230PEBK_Available-For-SaleSecuritiesDebtMaturitiesMortgage-BackedSecuritiesAmortizedCost  
Equity securities 748PEBK_Available-For-SaleSecuritiesDebtMaturitiesEquitySecuritiesAmortizedCost  
Total 272,230us-gaap_AvailableForSaleSecuritiesAmortizedCost 272,167us-gaap_AvailableForSaleSecuritiesAmortizedCost
Estimated Fair Value    
Due within one year 4,412us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Due from one to five years 52,794us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Due from five to ten years 115,413us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Due after ten years 19,930us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue  
Mortgage-backed securities 88,553PEBK_Available-For-SaleSecuritiesDebtMaturitiesMortgage-BackedSecuritiesFairValue  
Equity securities 1,473PEBK_Available-For-SaleSecuritiesDebtMaturitiesEquitySecuritiesFairValue  
Total $ 282,575us-gaap_AvailableForSaleSecuritiesDebtSecurities