Earnings Per Common Share - Basic and Diluted Earnings Per Common Share (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Earnings Per Share [Abstract]
Net income	$ 170,987	$ 150,922
Less: Preferred stock dividends	1,669	1,669
Net income available to common shareholders	169,318	149,253
Less: Earnings allocated to participating securities	2,111	1,445
Distributed earnings allocated to common stock	63,126	61,068
Undistributed earnings allocated to common stock	104,081	86,740
Net earnings allocated to common stock	$ 167,207	$ 147,808
Weighted-average shares outstanding for basic earnings per common share	63,101,492	64,255,246
Dilutive effect of stock compensation	0	73,798
Weighted-average shares outstanding for diluted earnings per common share	63,101,492	64,329,044