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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, 2019
Mar. 31, 2018
Income available to common shareholders:    
Net income $ 482,742 $ 352,610
Less: Preferred stock dividends (18,130) (18,130)
Net income available to common equity 464,612 334,480
Less: Income attributable to unvested stock-based compensation awards (2,526) (1,732)
Net income available to common shareholders $ 462,086 $ 332,748
Weighted-average shares outstanding:    
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards 138,637 149,470
Less: Unvested stock-based compensation awards (748) (782)
Weighted-average shares outstanding 137,889 148,688
Basic earnings per common share $ 3.35 $ 2.24