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Employee and Director Benefit Plans - Amounts Recognized in the Accumulated Post-Retirement Benefit Obligation and Other Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Postemployment Benefits [Abstract]  
Unrecognized actuarial loss $ 557pfbx_DefinedBenefitPlanAccumulatedOtherComprehensiveLossIncomeUnrecognizedNetActuarialGainsLossesNetOfTax
Amortization of prior service cost 81us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditAfterTax
Total accumulated other comprehensive loss $ 638us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax