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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