Net Income Per Common Share - Basic and Diluted Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share Reconciliation [Abstract]
Income available to common stockholders	$ 57,533	$ 35,915
Income available to common stockholders plus assumed exercises of stock options	$ 57,533	$ 35,915
Income available to common stockholders - Shares	32,892,857	32,666,916
Dilutive effect of stock options - Shares	569,882	648,417
Income available to common stockholders plus assumed exercises of stock options - Shares	33,462,739	33,315,333
Income available to common stockholders - Per Share Amount	$ 1.75	$ 1.10
Income available to common stockholders plus assumed exercises of stock options - Per Share Amount	$ 1.72	$ 1.08