Earnings Per Common Share - Basic and Diluted Earnings Per Common Share (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net income	$ 155,651	$ 169,760	$ 495,422	$ 387,976
Less: Preferred stock dividends	1,668	1,668	5,006	5,006
Net income available to common shareholders	153,983	168,092	490,416	382,970
Less: Earnings allocated to participating securities	1,533	1,503	5,016	3,414
Distributed earnings allocated to common stock	58,913	55,820	170,702	151,963
Undistributed earnings allocated to common stock	93,537	110,769	314,698	227,593
Net earnings allocated to common stock	$ 152,450	$ 166,589	$ 485,400	$ 379,556
Weighted-average shares outstanding for basic earnings per common share	64,067,352	64,157,662	64,226,113	64,107,621
Dilutive effect of stock compensation	171,892	343,750	208,187	369,268
Weighted-average shares outstanding for diluted earnings per common share	64,239,244	64,501,412	64,434,300	64,476,889