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Securities - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Available for sale securities:      
Available for sale securities, Due in one year or less, Amortized Cost $ 5,715us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost    
Available for sale securities, Due after one year through five years, Amortized Cost 61,539us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost    
Available for sale securities, Due after five year through ten years, Amortized Cost 52,867us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost    
Available for sale securities, Due after ten years, Amortized Cost 59,303us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost    
Available for sale securities, Mortgage-backed securities, Amortized Cost 35,671pfbx_MortgagebackedSecuritiesAvailableforsaleAmortizedCostDisclosure    
Totals, Amortized Cost 215,095us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis 285,626us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis 253,649us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Available for sale securities, Due in one year or less, Fair Value 5,762us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue    
Available for sale securities, Due after one year through five years, Fair Value 61,738us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue    
Available for sale securities, Due after five years through ten years, Fair Value 52,627us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue    
Available for sale securities, Due after ten years, Fair Value 58,528us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue    
Available for sale securities, Mortgage-backed securities, Fair value 35,817us-gaap_MortgageBackedSecuritiesAvailableForSaleFairValueDisclosure    
Totals, Fair Value 214,472us-gaap_AvailableForSaleSecuritiesDebtSecurities 274,790us-gaap_AvailableForSaleSecuritiesDebtSecurities 258,226us-gaap_AvailableForSaleSecuritiesDebtSecurities
Held to maturity securities:      
Held to maturity securities, Due in one year or less, Amortized Cost 211us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount    
Held to maturity securities, Due after one year through five years, Amortized Cost 3,964us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount    
Held to maturity securities, Due after five years through ten years, Amortized Cost 8,118us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount    
Held to maturity securities, Due after ten years, Amortized Cost 5,491us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount    
Totals, Amortized Cost 17,784us-gaap_HeldToMaturitySecurities 11,142us-gaap_HeldToMaturitySecurities 7,125us-gaap_HeldToMaturitySecurities
Held to maturity securities, Due in one year or less, Fair Value 211us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue    
Held to maturity securities, Due after one year through five years, Fair Value 3,976us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue    
Held to maturity securities, Due after five years through ten years, Fair Value 8,179us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue    
Held to maturity securities, Due after ten years, Fair Value 5,493us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue    
Totals, Fair Value $ 17,859us-gaap_HeldToMaturitySecuritiesFairValue $ 10,686us-gaap_HeldToMaturitySecuritiesFairValue $ 7,225us-gaap_HeldToMaturitySecuritiesFairValue