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Merger - Business Acquisition, Unaudited Pro Forma Information (Detail) - UCB [Member] - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net interest income after provision for loan losses | $ 74,642 | $ 70,100 | $ 65,878
Noninterest income | 18,331 | 20,782 | 20,937
Net income | $ 18,984 | $ 19,284 | $ 12,914
Basic | $ 1.51 | $ 1.82 | $ 1.42
Diluted | $ 1.37 | $ 1.56 | $ 1.18

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