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Loans and Allowance for Loan Losses - Schedule of Analysis of Non-Accruing Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans $ 4,222 $ 4,826
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 340 956
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 1,019 1,277
Real Estate [Member] | Secured by Multi-family Residential Properties [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 583  
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 843 2,314
Commercial and Industrial Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 47 139
Consumer Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans $ 1,390 $ 140