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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

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