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Securities - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]      
Sale of available for sale debt securities $ 44,279,605us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt $ 26,075,225us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt $ 77,605,104us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt
Realized gain on sale of available for sale debt securities 98,859us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet 257,997us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet 1,363,802us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
Impairment loss on other investment     360,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
Amount of securities with fair value $ 200,474,637us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue $ 262,830,011us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue $ 241,879,775us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue
U.S. Treasuries [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Securities issued contained unrealized Loss 4us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_DebtSecurityAxis
= us-gaap_USTreasurySecuritiesMember
   
Securities issued 8pfbx_AvailableForSaleSecuritiesQualitativeDisclosureNumberOfPositions
/ us-gaap_DebtSecurityAxis
= us-gaap_USTreasurySecuritiesMember
   
U.S. Government agencies [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Securities issued contained unrealized Loss 19us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
   
Securities issued 24pfbx_AvailableForSaleSecuritiesQualitativeDisclosureNumberOfPositions
/ us-gaap_DebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
   
Mortgage-backed securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Securities issued contained unrealized Loss 5us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember
   
Securities issued 10pfbx_AvailableForSaleSecuritiesQualitativeDisclosureNumberOfPositions
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember
   
States and political subdivisions [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Securities issued contained unrealized Loss 20us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
   
Securities issued 152pfbx_AvailableForSaleSecuritiesQualitativeDisclosureNumberOfPositions
/ us-gaap_DebtSecurityAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember