Earnings Per Common Share (Earnings Per Share Basic And Diluted) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings for basic and diluted earnings per common share:
Net income	$ 38,199	$ 99,736
Less: Preferred stock dividends	1,969	1,969
Undistributed Earnings, Basic	36,230	97,767
Undistributed Earnings, Diluted, Total	36,230	97,767
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	209	218
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted	209	218
Net Income (Loss) Available to Common Stockholders, Basic, Total	36,021	97,549
Net Income (Loss) Available to Common Stockholders, Diluted	$ 36,021	$ 97,549
Shares:
Weighted-average common shares outstanding - basic	90,936	91,962
Effect of dilutive securities	270	263
Weighted-average common shares outstanding - diluted	91,206	92,225
Earnings per common share(1):
Basic	$ 0.40	$ 1.06
Diluted	$ 0.39	$ 1.06