Earnings Per Common Share - Basic and Diluted Earnings Per Common Share (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share [Abstract]
Net income	$ 145,499	$ 162,118	$ 281,189	$ 339,771
Less: Preferred stock dividends	1,669	1,669	3,338	3,338
Net income available to common shareholders	143,830	160,449	277,851	336,433
Less: Earnings allocated to participating securities	1,693	1,645	3,334	3,468
Distributed earnings allocated to common stock	59,108	55,783	118,188	111,789
Undistributed earnings allocated to common stock	83,029	103,021	156,329	221,176
Net earnings allocated to common stock	$ 142,137	$ 158,804	$ 274,517	$ 332,965
Weighted-average shares outstanding for basic earnings per common share	64,192,907	64,240,789	64,204,615	64,306,809
Dilutive effect of stock compensation	140,280	187,172	147,693	225,267
Weighted-average shares outstanding for diluted earnings per common share	64,333,187	64,427,961	64,352,308	64,532,076