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Earnings per Common Share - Computation of Basic and Diluted Earnings per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Basic      
Net income $ 40,546 $ 32,192 $ 33,878
Preferred stock dividends 0 0 647
Less allocation of earnings and dividends to participating securities 173 98 87
Net income available to common shareholders—basic $ 40,373 $ 32,094 $ 33,144
Weighted average common shares outstanding 15,408,863 16,129,875 15,652,881
Less average participating securities 65,648 49,012 40,013
Weighted average common shares outstanding for earnings per common share basic 15,343,215 16,080,863 15,612,868
Basic earnings per share $ 2.63 $ 2.00 $ 2.12
Diluted      
Net income available to common shareholders—diluted $ 40,373 $ 32,094 $ 33,791
Add: dilutive effects of convertible preferred shares     1,198,859
Average shares and dilutive potential common shares outstanding—diluted 15,343,215 16,080,863 16,851,740
Diluted earnings per share $ 2.63 $ 2.00 $ 2.01