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Loans and Allowance for Loan Losses - Schedule of Average Net Investment Impaired Loans and Interest Income Recognized and Received on Impaired Loans (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
Financing Receivable Impaired [Line Items] |  |
Average Recorded Investment | $ 8,003 | $ 14,743
Interest Income Recognized | 176 | 552
Interest Income Received | 429 | 540
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Average Recorded Investment | 1,509 | 2,769
Interest Income Recognized | 31 | 46
Interest Income Received | 33 | 46
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Average Recorded Investment | 96 | 143
Interest Income Recognized |  | 3
Interest Income Received |  | 3
Real Estate [Member] | Secured by Multi-family Residential Properties [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Average Recorded Investment | 2,289 | 3,565
Interest Income Recognized | 48 | 178
Interest Income Received | 69 | 170
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Average Recorded Investment | 3,906 | 8,186
Interest Income Recognized | 79 | 324
Interest Income Received | 309 | 320
Commercial and Industrial Loans [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Average Recorded Investment | 203 | 80
Interest Income Recognized | 18 | 1
Interest Income Received | $ 18 | $ 1

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