Earnings per common share (Tables)

3 Months Ended

Mar. 31, 2021

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
	2021			2020
	(In thousands, except per share)
Income available to common shareholders:
Net income	$	447,249		$	268,822
Less: Preferred stock dividends		(17,050	)		(17,078	)
Net income available to common equity		430,199			251,744
Less: Income attributable to unvested stock-based    compensation awards		(2,108	)		(1,043	)
Net income available to common shareholders	$	428,091		$	250,701
Weighted-average shares outstanding:
Common shares outstanding (including common stock    issuable) and unvested stock-based compensation    awards		129,414			130,440
Less: Unvested stock-based compensation awards		(877	)		(744	)
Weighted-average shares outstanding		128,537			129,696
Basic earnings per common share	$	3.33		$	1.93

Computations of Diluted Earnings Per Common Share

The computations of diluted earnings per common share follow:

	Three Months Ended March 31
	2021			2020
	(In thousands, except per share)
Net income available to common equity	$	430,199		$	251,744
Less: Income attributable to unvested stock-based    compensation awards		(2,106	)		(1,043	)
Net income available to common shareholders	$	428,093		$	250,701
Adjusted weighted-average shares outstanding:
Common and unvested stock-based compensation    awards		129,414			130,440
Less: Unvested stock-based compensation awards		(877	)		(744	)
Plus: Incremental shares from assumed conversion of    stock-based compensation awards and warrants to    purchase common stock		132			59
Adjusted weighted-average shares outstanding		128,669			129,755
Diluted earnings per common share	$	3.33		$	1.93