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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net interest income after provision for loan losses | $ 83,825 | $ 74,642 | $ 70,100
Noninterest income | 22,443 | 18,331 | 20,782
Net income | $ 33,653 | $ 18,984 | $ 19,284
Basic | $ 2.11 | $ 1.51 | $ 1.82
Diluted | $ 2.00 | $ 1.37 | $ 1.56

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