Earnings Per Common Share (Basic and Diluted Earnings Per Common Share) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share [Abstract]
Net income (loss)	$ 582,542	$ 597,973	$ 579,150
Less: Preferred stock dividends	6,675	6,675	6,675
Net income (loss) available to common shareholders	575,867	591,298	572,475
Less: Earnings allocated to participating securities	6,236	6,283	5,210
Net earnings allocated to common stock	569,631	585,015	567,265
Distributed earnings allocated to common stock	239,879	229,749	207,924
Undistributed earnings allocated to common stock	$ 329,752	$ 355,266	$ 359,341
Weighted-average shares outstanding for basic earnings per common share	64,120,455	64,204,239	64,156,870
Dilutive effect of stock compensation	142,191	200,594	363,648
Weighted-average shares outstanding for diluted earnings per common share	64,262,646	64,404,833	64,520,518