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Merger - Schedule of Financial Information for Former Included in Consolidated Statement of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net interest income after provision for loan losses |  |  |  |  |  |  |  |  |  | $ 65,327 | $ 54,502 | $ 51,559
Noninterest income |  |  |  |  |  |  |  |  |  | 18,131 | 16,334 | 16,132
Net income | $ 7,569 | $ (3,433) | $ 3,014 | $ 6,989 | $ 3,981 | $ 3,660 | $ 3,596 | $ 4,635 |  | $ 14,139 | $ 15,872 | $ 17,217
Former UCB [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net interest income after provision for loan losses |  |  |  |  |  |  |  |  | $ 3,227 |  |  |
Noninterest income |  |  |  |  |  |  |  |  | 373 |  |  |
Net income |  |  |  |  |  |  |  |  | $ 1,707 |  |  |

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