Earnings Per Common Share - Basic and Diluted Earnings Per Common Share (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Net income	$ 119,114	$ 118,068	$ 218,216	$ 234,083
Less: Preferred stock dividends	1,669	1,669	3,338	3,820
Net income available to common shareholders	117,445	116,399	214,878	230,263
Less: Earnings allocated to participating securities	1,036	1,141	1,888	2,307
Distributed earnings allocated to common stock	48,092	45,824	96,143	91,484
Undistributed earnings allocated to common stock	68,317	69,434	116,847	136,472
Net earnings allocated to common stock	$ 116,409	$ 115,258	$ 212,990	$ 227,956
Weighted-average shares outstanding for basic earnings per common share	64,112,828	63,606,340	64,082,185	63,457,245
Dilutive effect of stock compensation	354,401	495,819	382,395	511,288
Weighted-average shares outstanding for diluted earnings per common share	64,467,229	64,102,159	64,464,580	63,968,533