Earnings Per Common Share - Basic and Diluted Earnings Per Common Share (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Earnings Per Share [Abstract]
Net income	$ 146,501	$ 155,651	$ 427,690	$ 495,422
Less: Preferred stock dividends	1,668	1,668	5,006	5,006
Net income available to common shareholders	144,833	153,983	422,684	490,416
Less: Earnings allocated to participating securities	1,581	1,533	4,855	5,016
Distributed earnings allocated to common stock	60,706	58,913	178,894	170,702
Undistributed earnings allocated to common stock	82,546	93,537	238,935	314,698
Net earnings allocated to common stock	$ 143,252	$ 152,450	$ 417,829	$ 485,400
Weighted-average shares outstanding for basic earnings per common share	63,957,786	64,067,352	64,121,925	64,226,113
Dilutive effect of stock compensation	127,221	171,892	141,501	208,187
Weighted-average shares outstanding for diluted earnings per common share	64,085,007	64,239,244	64,263,426	64,434,300