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Loans and Allowance for Loan Losses - Schedule of Carrying Amount of Impaired Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Financing Receivable Impaired [Line Items] |  |
Impaired loans with no related allowance recorded, Carrying Amount | $ 1,223 | $ 8,387
Impaired loans with an allowance recorded, Unpaid Principal Balance | 1,223 | 8,778
Impaired loans with an allowance recorded, Carrying Amount | 5,061 | 2,218
Impaired loans with an allowance recorded, Unpaid Principal Balance | 5,061 | 2,218
Impaired loans with an allowance recorded, Related Allowances | 818 | 762
Total impaired loans, Carrying Amount | 6,284 | 10,605
Total impaired loans, Unpaid Principal Balance | 6,284 | 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 an 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 | 96 | 96
Impaired loans with an 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 |  | 755
Impaired loans with an allowance recorded, Unpaid Principal Balance |  | 1,146
Impaired loans with an allowance recorded, Carrying Amount | 1,711 | 1,615
Impaired loans with an allowance recorded, Unpaid Principal Balance | 1,711 | 1,615
Impaired loans with an allowance recorded, Related Allowances | 548 | 691
Total impaired loans, Carrying Amount | 1,711 | 2,370
Total impaired loans, Unpaid Principal Balance | 1,711 | 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 | 1,127 | 6,091
Impaired loans with an allowance recorded, Unpaid Principal Balance | 1,127 | 6,091
Impaired loans with an allowance recorded, Carrying Amount | 1,452 |
Impaired loans with an allowance recorded, Unpaid Principal Balance | 1,452 |
Impaired loans with an allowance recorded, Related Allowances | 86 |
Total impaired loans, Carrying Amount | 2,579 | 6,091
Total impaired loans, Unpaid Principal Balance | 2,579 | $ 6,091
Commercial and Industrial Loans [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Impaired loans with an allowance recorded, Carrying Amount | 453 |
Impaired loans with an allowance recorded, Unpaid Principal Balance | 453 |
Impaired loans with an allowance recorded, Related Allowances | 89 |
Total impaired loans, Carrying Amount | 453 |
Total impaired loans, Unpaid Principal Balance | $ 453 |

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