Earnings per common share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Computations of Basic Earnings Per Common Share

The computations of basic earnings per common share follow:

	Three Months Ended March 31
	2018			2017
	(In thousands, except per share)
Income available to common shareholders:
Net income	$	352,610			348,927
Less: Preferred stock dividends (a)		(18,130	)		(18,237	)
Net income available to common equity		334,480			330,690
Less: Income attributable to unvested stock-based    compensation awards		(1,732	)		(2,128	)
Net income available to common shareholders	$	332,748			328,562
Weighted-average shares outstanding:
Common shares outstanding (including common stock    issuable) and unvested stock-based compensation awards		149,470			155,463
Less: Unvested stock-based compensation awards		(782	)		(1,036	)
Weighted-average shares outstanding		148,688			154,427
Basic earnings per common share	$	2.24			2.13

 (a)Including impact of not as yet declared cumulative dividends.

Computations of Diluted Earnings Per Common Share

7. Earnings per common share, continued

The computations of diluted earnings per common share follow:

	Three Months Ended March 31
	2018			2017
	(In thousands, except per share)
Net income available to common equity	$	334,480			330,690
Less: Income attributable to unvested stock-based    compensation awards		(1,731	)		(2,123	)
Net income available to common shareholders	$	332,749			328,567
Adjusted weighted-average shares outstanding:
Common and unvested stock-based compensation awards		149,470			155,463
Less: Unvested stock-based compensation awards		(782	)		(1,036	)
Plus: Incremental shares from assumed conversion of    stock-based compensation awards and warrants to    purchase common stock		217			522
Adjusted weighted-average shares outstanding		148,905			154,949
Diluted earnings per common share	$	2.23			2.12