Earnings per common share (Tables)

3 Months Ended

Mar. 31, 2016

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
	2016			2015
	(in thousands, except per share)
Income available to common shareholders:
Net income	$	298,528			241,613
Less: Preferred stock dividends (a)		(20,318	)		(20,318	)
Net income available to common equity		278,210			221,295
Less: Income attributable to unvested stock-based compensation awards		(2,466	)		(2,465	)
Net income available to common shareholders	$	275,744			218,830
Weighted-average shares outstanding:
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards		160,220			133,542
Less: Unvested stock-based compensation awards		(1,486	)		(1,493	)
Weighted-average shares outstanding		158,734			132,049
Basic earnings per common share	$	1.74			1.66

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

Computations of Diluted Earnings Per Common Share

The computations of diluted earnings per common share follow:

	Three months ended March 31
	2016			2015
	(in thousands, except per share)
Net income available to common equity	$	278,210			221,295
Less: Income attributable to unvested stock-based compensation awards		(2,462	)		(2,458	)
Net income available to common shareholders	$	275,748			218,837
Adjusted weighted-average shares outstanding:
Common and unvested stock-based compensation awards		160,220			133,542
Less: Unvested stock-based compensation awards		(1,486	)		(1,493	)
Plus: Incremental shares from assumed conversion of stock-based compensation awards and warrants to purchase common stock		447			720
Adjusted weighted-average shares outstanding		159,181			132,769
Diluted earnings per common share	$	1.73			1.65