Earnings Per Common Share (Basic and Diluted Earnings Per Common Share) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share [Abstract]
Net income	$ 597,973	$ 579,150	$ 443,079
Less: Preferred stock dividends	6,675	6,675	7,157
Net income available to common shareholders	591,298	572,475	435,922
Less: Earnings allocated to participating securities	6,283	5,210	3,881
Net earnings allocated to common stock	585,015	567,265	432,041
Distributed earnings allocated to common stock	229,749	207,924	187,202
Undistributed earnings allocated to common stock	$ 355,266	$ 359,341	$ 244,839
Weighted-average shares outstanding for basic earnings per common share	64,204,239	64,156,870	63,612,658
Dilutive effect of stock compensation	200,594	363,648	489,462
Weighted-average shares outstanding for diluted earnings per common share	64,404,833	64,520,518	64,102,120