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, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share Reconciliation [Abstract]
Income available to common stockholders	$ 193,100	$ 167,630	$ 99,586
Income available to common stockholders plus assumed exercises of stock options	$ 193,100	$ 167,630	$ 99,586
Income available to common stockholders - Shares	32,778,355	32,716,099	32,672,522
Dilutive effect of stock options - Shares	661,141	598,047	538,430
Income available to common stockholders plus assumed exercises of stock options - Shares	33,439,496	33,314,146	33,210,952
Income available to common stockholders - Per Share Amount	$ 5.89	$ 5.12	$ 3.05
Income available to common stockholders plus assumed exercises of stock options - Per Share Amount	$ 5.77	$ 5.03	$ 3.00