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Financial Instruments with Off-Balance-Sheet Risk - Additional Information (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Financial Instruments With Off Balance Sheet Risk [Abstract]      
Outstanding irrevocable letters of credit $ 1,879,678pfbx_IrrevocableLettersOfCreditOutstanding $ 3,059,011pfbx_IrrevocableLettersOfCreditOutstanding $ 3,599,011pfbx_IrrevocableLettersOfCreditOutstanding
Unused loan commitments amount outstanding 66,663,320pfbx_UnusedLoanCommitmentsAmountOutstanding 68,171,024pfbx_UnusedLoanCommitmentsAmountOutstanding 80,741,699pfbx_UnusedLoanCommitmentsAmountOutstanding
Fixed rate commitments amount outstanding $ 35,753,000pfbx_FixedRateCommitmentsAmountOutstanding $ 38,324,000pfbx_FixedRateCommitmentsAmountOutstanding $ 46,956,000pfbx_FixedRateCommitmentsAmountOutstanding