Earnings Per Common Share - Summary of Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Numerator for both basic and diluted earnings per common share:
Net income available to common shareholders	$ 39,810	$ 41,593
Denominator:
Total average basic common shares outstanding	59,217,711	61,445,399
Effect of dilutive stock options and other stock compensation	157,342	147,966
Total diluted average common shares outstanding	59,375,053	61,593,365
Earnings per common share - basic	$ 0.67	$ 0.68
Earnings per common share - diluted	$ 0.67	$ 0.68