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Earnings Per Common Share - Summary of Earnings Per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Numerator for both basic and diluted earnings per common share:      
Net income available to common shareholders $ 232,135 $ 119,400 $ 158,873
Denominator:      
Total average basic common shares outstanding 65,520,527 67,260,796 56,108,084
Effect of dilutive stock options and other stock compensation 149,443 49,788 106,280
Total diluted average common shares outstanding 65,669,970 67,310,584 56,214,364
Earnings per common share—basic $ 3.54 $ 1.78 $ 2.83
Earnings per common share—diluted $ 3.53 $ 1.77 $ 2.83