Net Income Per Common Share - Basic and Diluted Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
(Numerator)
Income available to common stockholders	$ 50,988	$ 55,352	$ 163,531	$ 135,974
(Denominator)
Weighted average shares outstanding for basic earnings per common share	32,937,149	32,825,931	32,916,996	32,748,116
Dilutive effect of stock compensation	602,240	710,627	576,019	681,045
Weighted-average shares outstanding for diluted earnings per common share	33,539,389	33,536,558	33,493,015	33,429,161
Basic earnings per share	$ 1.55	$ 1.69	$ 4.97	$ 4.15
Diluted earnings per share	$ 1.52	$ 1.65	$ 4.88	$ 4.07