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Merger - Business Acquisition, Unaudited Pro Forma Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income after provision for loan losses |  |  |  |  |  |  |  |  | $ 54,502 | $ 51,559 | $ 46,192
Noninterest income |  |  |  |  |  |  |  |  | 16,334 | 16,132 | 14,278
Net income | $ 3,981 | $ 3,660 | $ 3,596 | $ 4,635 | $ 3,631 | $ 3,680 | $ 5,181 | $ 4,725 | $ 15,872 | $ 17,217 | $ 12,745
Basic | $ 0.36 | $ 0.33 | $ 0.32 | $ 0.47 | $ 0.39 | $ 0.41 | $ 0.61 | $ 0.55 | $ 1.48 | $ 1.96 | $ 1.43
Diluted | $ 0.30 | $ 0.29 | $ 0.29 | $ 0.40 | $ 0.33 | $ 0.34 | $ 0.47 | $ 0.43 | $ 1.28 | $ 1.57 | $ 1.17
Pro Forma [Member] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income after provision for loan losses |  |  |  |  |  |  |  |  | $ 54,456 | $ 51,389 | $ 46,852
Noninterest income |  |  |  |  |  |  |  |  | 16,334 | 16,132 | 14,699
Net income |  |  |  |  |  |  |  |  | $ 15,769 | $ 16,949 | $ 11,931
Basic |  |  |  |  |  |  |  |  | $ 1.47 | $ 1.93 | $ 1.32
Diluted |  |  |  |  |  |  |  |  | $ 1.28 | $ 1.55 | $ 1.09

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