Earnings Per Common Share - Basic and Diluted Earnings Per Common Share (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income	$ 169,760	$ 107,975	$ 387,976	$ 342,058
Less: Preferred stock dividends	1,668	1,668	5,006	5,488
Net income available to common shareholders	168,092	106,307	382,970	336,570
Less: Earnings allocated to participating securities	1,503	932	3,414	3,228
Distributed earnings allocated to common stock	55,820	47,740	151,963	139,224
Undistributed earnings allocated to common stock	110,769	57,635	227,593	194,118
Net earnings allocated to common stock	$ 166,589	$ 105,375	$ 379,556	$ 333,342
Weighted-average shares outstanding for basic earnings per common share	64,157,662	63,652,020	64,107,621	63,522,884
Dilutive effect of stock compensation	343,750	444,636	369,268	489,219
Weighted-average shares outstanding for diluted earnings per common share	64,501,412	64,096,656	64,476,889	64,012,103