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Merger - Schedule of Financial Information for Former Included in Consolidated Statement of Operations (Detail) - USD ($)
 3 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]                        
Net interest income after provision for loan losses                   $ 79,615,000 $ 84,065,000 $ 65,327,000
Noninterest income                   28,182,000 22,443,000 18,131,000
Net income $ 10,173,000 $ 7,682,000 $ 6,504,000 $ 7,833,000 $ 7,841,000 $ 7,708,000 $ 8,660,000 $ 9,669,000   $ 32,192,000 $ 33,878,000 $ 14,139,000
Former UCB [Member]                        
Business Acquisition [Line Items]                        
Net interest income after provision for loan losses                 $ 3,227,000      
Noninterest income                 373,000      
Net income                 $ 1,707,000