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Merger - Business Acquisition, Unaudited Pro Forma Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income after provision for loan losses |  |  |  |  |  |  |  |  | $ 51,559 | $ 46,192 | $ 40,366
Noninterest income |  |  |  |  |  |  |  |  | 16,132 | 14,278 | 13,874
Net income | $ 3,631 | $ 3,680 | $ 5,181 | $ 4,725 | $ 3,199 | $ 3,253 | $ 3,122 | $ 3,171 | $ 17,217 | $ 12,745 | $ 9,528
Basic | $ 0.39 | $ 0.41 | $ 0.61 | $ 0.55 | $ 0.36 | $ 0.36 | $ 0.35 | $ 0.36 | $ 1.96 | $ 1.43 | $ 0.99
Diluted | $ 0.33 | $ 0.34 | $ 0.47 | $ 0.43 | $ 0.29 | $ 0.30 | $ 0.29 | $ 0.29 | $ 1.57 | $ 1.17 | $ 0.85
Pro Forma [Member] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income after provision for loan losses |  |  |  |  |  |  |  |  | $ 51,389 | $ 46,852 | $ 44,583
Noninterest income |  |  |  |  |  |  |  |  | 16,132 | 14,699 | 14,297
Net income |  |  |  |  |  |  |  |  | $ 16,949 | $ 11,931 | $ 10,045
Basic |  |  |  |  |  |  |  |  | $ 1.93 | $ 1.32 | $ 1.06
Diluted |  |  |  |  |  |  |  |  | $ 1.55 | $ 1.09 | $ 0.90

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