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Loans and Allowance for Loan Losses - Schedule of Carrying Amount of Impaired Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable Impaired [Line Items]
Impaired loans with no related allowance recorded, Carrying Amount	$ 54	$ 8,387
Impaired loans with no related allowance recorded, Unpaid Principal Balance	54	8,778
Impaired loans with an allowance recorded, Carrying Amount	2,660	2,218
Impaired loans with an allowance recorded, Unpaid Principal Balance	2,660	2,218
Impaired loans with an allowance recorded, Related Allowances	310	762
Total impaired loans, Carrying Amount	2,714	10,605
Total impaired loans, Unpaid Principal Balance	2,714	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 an allowance recorded, Carrying Amount	1,445	603
Impaired loans with an allowance recorded, Unpaid Principal Balance	1,445	603
Impaired loans with an allowance recorded, Related Allowances	95	71
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	54	96
Impaired loans with no related allowance recorded, Unpaid Principal Balance	54	96
Impaired loans with an allowance recorded, Carrying Amount	198
Impaired loans with an allowance recorded, Unpaid Principal Balance	198
Impaired loans with an allowance recorded, Related Allowances	5
Total impaired loans, Carrying Amount	252	96
Total impaired loans, Unpaid Principal Balance	252	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		755
Impaired loans with no related allowance recorded, Unpaid Principal Balance		1,146
Impaired loans with an allowance recorded, Carrying Amount		1,615
Impaired loans with an allowance recorded, Unpaid Principal Balance		1,615
Impaired loans with an allowance recorded, Related Allowances		691
Total impaired loans, Carrying Amount		2,370
Total impaired loans, Unpaid Principal Balance		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		6,091
Impaired loans with no related allowance recorded, Unpaid Principal Balance		6,091
Impaired loans with an allowance recorded, Carrying Amount	573
Impaired loans with an allowance recorded, Unpaid Principal Balance	573
Impaired loans with an allowance recorded, Related Allowances	130
Total impaired loans, Carrying Amount	573	6,091
Total impaired loans, Unpaid Principal Balance	573	$ 6,091
Commercial and Industrial Loans [Member]
Financing Receivable Impaired [Line Items]
Impaired loans with an allowance recorded, Carrying Amount	444
Impaired loans with an allowance recorded, Unpaid Principal Balance	444
Impaired loans with an allowance recorded, Related Allowances	80
Total impaired loans, Carrying Amount	444
Total impaired loans, Unpaid Principal Balance	$ 444

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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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