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Earnings per Common Share - Computation of Basic and Diluted Earnings per Common Share (Detail) - USD ($)
 3 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, 2020
Dec. 31, 2019
Dec. 31, 2018
Basic                      
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
Preferred stock dividends                   647,000 959,000
Net income available to common shareholders                 $ 32,192,000 $ 33,231,000 $ 13,180,000
Weighted average common shares outstanding for earnings per common share basic                 16,129,875 15,652,881 11,971,786
Basic earnings per share $ 0.64 $ 0.48 $ 0.41 $ 0.47 $ 0.48 $ 0.48 $ 0.55 $ 0.61 $ 2.00 $ 2.12 $ 1.10
Diluted                      
Net income available to common shareholders—basic                 $ 32,192,000 $ 33,231,000 $ 13,180,000
Preferred stock dividends                   647,000 959,000
Net income available to common shareholders—diluted                 $ 32,192,000 $ 33,878,000 $ 14,139,000
Weighted average common shares outstanding for earnings per common share basic                 16,129,875 15,652,881 11,971,786
Add: dilutive effects of convertible preferred shares                   1,198,859 1,883,921
Average shares and dilutive potential common shares outstanding—diluted                 16,129,875 16,851,740 13,855,707
Diluted earnings per share $ 0.64 $ 0.48 $ 0.41 $ 0.47 $ 0.47 $ 0.46 $ 0.51 $ 0.57 $ 2.00 $ 2.01 $ 1.02