Net Income Per Common Share - Basic and Diluted Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
(Numerator)
Income available to common stockholders	$ 212,465	$ 193,100	$ 167,630
(Denominator)
Weighted average shares outstanding for basic earnings per common share	32,919,348	32,778,355	32,716,099
Dilutive effect of stock compensation	575,139	661,141	598,047
Weighted-average shares outstanding for diluted earnings per common share	33,494,487	33,439,496	33,314,146
Basic earnings per share	$ 6.45	$ 5.89	$ 5.12
Diluted earnings per share	$ 6.34	$ 5.77	$ 5.03