Earnings per common share (Tables)

3 Months Ended

Mar. 31, 2017

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
	2017			2016
	(In thousands, except per share)
Income available to common shareholders:
Net income	$	348,927			298,528
Less: Preferred stock dividends (a)		(18,237	)		(20,318	)
Net income available to common equity		330,690			278,210
Less: Income attributable to unvested stock-based    compensation awards		(2,128	)		(2,466	)
Net income available to common shareholders	$	328,562			275,744
Weighted-average shares outstanding:
Common shares outstanding (including common stock    issuable) and unvested stock-based compensation awards		155,463			160,220
Less: Unvested stock-based compensation awards		(1,036	)		(1,486	)
Weighted-average shares outstanding		154,427			158,734
Basic earnings per common share	$	2.13			1.74

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

Computations of Diluted Earnings Per Common Share

8. Earnings per common share, continued

The computations of diluted earnings per common share follow:

	Three Months Ended March 31
	2017			2016
	(In thousands, except per share)
Net income available to common equity	$	330,690			278,210
Less: Income attributable to unvested stock-based    compensation awards		(2,123	)		(2,462	)
Net income available to common shareholders	$	328,567			275,748
Adjusted weighted-average shares outstanding:
Common and unvested stock-based compensation awards		155,463			160,220
Less: Unvested stock-based compensation awards		(1,036	)		(1,486	)
Plus: Incremental shares from assumed conversion of    stock-based compensation awards and warrants to    purchase common stock		522			447
Adjusted weighted-average shares outstanding		154,949			159,181
Diluted earnings per common share	$	2.12			1.73