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Loans and Allowance for Loan Losses - Schedule of Carrying Amount of Impaired Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Carrying Amount	$ 1,980	$ 8,387
Impaired loans with no related allowance recorded, Unpaid Principal Balance	1,980	8,778
Impaired loans with no related allowance recorded, Related Allowances	982	762
Impaired loans with an allowance recorded, Carrying Amount	4,970	2,218
Impaired loans with an allowance recorded, Unpaid Principal Balance	4,970	2,218
Total impaired loans, Carrying Amount	6,950	10,605
Total impaired loans, Unpaid Principal Balance	6,950	10,996
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Carrying Amount		1,445
Impaired loans with no related allowance recorded, Unpaid Principal Balance		1,445
Impaired loans with no related allowance recorded, Related Allowances	95	71
Impaired loans with an allowance recorded, Carrying Amount	1,445	603
Impaired loans with an allowance recorded, Unpaid Principal Balance	1,445	603
Total impaired loans, Carrying Amount	1,445	2,048
Total impaired loans, Unpaid Principal Balance	1,445	2,048
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Carrying Amount	96	96
Impaired loans with no related allowance recorded, Unpaid Principal Balance	96	96
Total impaired loans, Carrying Amount	96	96
Total impaired loans, Unpaid Principal Balance	96	96
Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Carrying Amount	749	755
Impaired loans with no related allowance recorded, Unpaid Principal Balance	749	1,146
Impaired loans with no related allowance recorded, Related Allowances	691	691
Impaired loans with an allowance recorded, Carrying Amount	1,601	1,615
Impaired loans with an allowance recorded, Unpaid Principal Balance	1,601	1,615
Total impaired loans, Carrying Amount	2,350	2,370
Total impaired loans, Unpaid Principal Balance	2,350	2,761
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Carrying Amount	1,135	6,091
Impaired loans with no related allowance recorded, Unpaid Principal Balance	1,135	6,091
Impaired loans with no related allowance recorded, Related Allowances	100
Impaired loans with an allowance recorded, Carrying Amount	1,464
Impaired loans with an allowance recorded, Unpaid Principal Balance	1,464
Total impaired loans, Carrying Amount	2,599	6,091
Total impaired loans, Unpaid Principal Balance	2,599	$ 6,091
Commercial and Industrial Loans [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Related Allowances	96
Impaired loans with an allowance recorded, Carrying Amount	460
Impaired loans with an allowance recorded, Unpaid Principal Balance	460
Total impaired loans, Carrying Amount	460
Total impaired loans, Unpaid Principal Balance	$ 460

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