Earnings Per Common Share - Computations of Basic Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income available to common shareholders:
Net income	$ 362,174	$ 447,249
Less: Preferred stock dividends	(21,765)	(17,050)
Net income available to common equity	340,409	430,199
Less: Income attributable to unvested stock-based compensation awards	(820)	(2,108)
Net income available to common shareholders	$ 339,589	$ 428,091
Weighted-average shares outstanding:
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards	129,274	129,414
Less: Unvested stock-based compensation awards	(329)	(877)
Weighted-average shares outstanding	128,945	128,537
Basic earnings per common share	$ 2.63	$ 3.33