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SECURITIES, By Contractual Maturity (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Amortized cost of available-for-sale securities by contractual maturity [Abstract]      
Due in one year or less $ 3,795us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost    
Due after one year through five years 20,574us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost    
Due after five years through ten years 3,833us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost    
Due after ten years 666us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost    
Mortgage-backed securities of government sponsored agencies 192,698pfbi_MortgageBackedSecuritiesOfGovernmentSponsoredAgenciesAmortizedCost    
Available for sale, Amortized Cost 221,566us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis    
Fair value of available-for-sale securities by contractual maturity [Abstract]      
Due in one year or less 3,822us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue    
Due after one year through five years 20,816us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue    
Due after five years through ten years 3,918us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue    
Due after ten years 695us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue    
Mortgage backed securities of government sponsored agencies 195,886pfbi_MortgageBackedSecuritiesOfGovernmentSponsoredAgenciesFairValueDisclosure    
Available for sale, Fair Value 225,137us-gaap_AvailableForSaleSecurities   229,750us-gaap_AvailableForSaleSecurities
Proceeds from the sale of securities $ 0us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities $ 0us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities