Earnings Per Common Share - Summary of Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Numerator for both basic and diluted earnings per common share:
Net income available to common shareholders	$ 148,907	$ 181,988	$ 232,135
Denominator:
Total average basic common shares outstanding	59,303,210	60,047,177	65,520,527
Effect of dilutive stock options and other stock compensation	124,779	168,197	149,443
Total diluted average common shares outstanding	59,427,989	60,215,374	65,669,970
Earnings per common share—basic	$ 2.51	$ 3.03	$ 3.54
Earnings per common share—diluted	$ 2.51	$ 3.02	$ 3.53