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SECURITIES, By Contractual Maturity (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Amortized cost of available for sale securities by contractual maturity [Abstract]      
Due in one year or less $ 1,348us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost    
Due after one year through five years 23,086us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost    
Due after five years through ten years 6,917us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost    
Due after ten years 1,197us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost    
Mortgage-backed securities of government sponsored agencies 194,938pfbi_MortgageBackedSecuritiesOfGovernmentSponsoredAgenciesAmortizedCost    
Available for sale, Amortized Cost 227,486us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis    
Fair value of available for sale securities by contractual maturity [Abstract]      
Due in one year or less 1,377us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue    
Due after one year through five years 23,237us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue    
Due after five years through ten years 6,933us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue    
Due after ten years 1,235us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue    
Mortgage backed securities of government sponsored agencies 196,968pfbi_MortgageBackedSecuritiesOfGovernmentSponsoredAgenciesFairValueDisclosure    
Available for sale, Fair Value 229,750us-gaap_AvailableForSaleSecurities 218,066us-gaap_AvailableForSaleSecurities  
Gain on disposition of securities 29us-gaap_GainLossOnSaleOfSecuritiesNet 1,413us-gaap_GainLossOnSaleOfSecuritiesNet 545us-gaap_GainLossOnSaleOfSecuritiesNet
Tax expense from gain on disposition of securities 10us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax 481us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax 185us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Proceeds from the sale of securities 13,319us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 8,650us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 0us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Securities with an approximate carrying value pledged as collateral $ 166,624us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral $ 168,150us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral