Earnings Per Common Share - Basic and Diluted Earnings Per Common Share (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Net income	$ 162,118	$ 119,114	$ 339,771	$ 218,216
Less: Preferred stock dividends	1,669	1,669	3,338	3,338
Net income available to common shareholders	160,449	117,445	336,433	214,878
Less: Earnings allocated to participating securities	1,645	1,036	3,468	1,888
Distributed earnings allocated to common stock	55,783	48,092	111,789	96,143
Undistributed earnings allocated to common stock	103,021	68,317	221,176	116,847
Net earnings allocated to common stock	$ 158,804	$ 116,409	$ 332,965	$ 212,990
Weighted-average shares outstanding for basic earnings per common share	64,240,789	64,112,828	64,306,809	64,082,185
Dilutive effect of stock compensation	187,172	354,401	225,267	382,395
Weighted-average shares outstanding for diluted earnings per common share	64,427,961	64,467,229	64,532,076	64,464,580