Earnings Per Common Share - Computations of Basic Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income available to common shareholders:
Net income	$ 646,596	$ 495,460	$ 1,226,292	$ 1,400,778
Less: Preferred stock dividends	(24,941)	(17,050)	(71,647)	(51,150)
Net income available to common equity	621,655	478,410	1,154,645	1,349,628
Less: Income attributable to unvested stock-based compensation awards	(1,106)	(2,452)	(2,245)	(6,823)
Net income available to common shareholders	$ 620,549	$ 475,958	$ 1,152,400	$ 1,342,805
Weighted-average shares outstanding:
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards	174,921	129,580	160,793	129,529
Less: Unvested stock-based compensation awards	(312)	(891)	(319)	(897)
Weighted-average shares outstanding	174,609	128,689	160,474	128,632
Basic earnings per common share	$ 3.55	$ 3.70	$ 7.18	$ 10.44