Earnings Per Common Share (Basic and Diluted Earnings Per Common Share) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net income	$ 443,079	$ 331,151	$ 443,599
Less: Preferred stock dividends	7,157	2,016	8,063
Redemption of preferred stock	0	5,514	0
Net income available to common shareholders	435,922	323,621	435,536
Less: Earnings allocated to participating securities	3,881	3,136	3,687
Net earnings allocated to common stock	432,041	320,485	431,849
Distributed earnings allocated to common stock	187,202	178,863	175,540
Undistributed earnings allocated to common stock	$ 244,839	$ 141,622	$ 256,309
Weighted-average shares outstanding for basic earnings per common share	63,612,658	62,727,053	62,741,769
Dilutive effect of stock compensation	489,462	276,784	700,101
Weighted-average shares outstanding for diluted earnings per common share	64,102,120	63,003,837	63,441,870