Earnings Per Share - Reconciliation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator
Net income	$ 107,337	$ 93,422	$ 84,092	$ 120,395	$ 147,625	$ 137,151	$ 284,851	$ 405,171
Preferred stock dividends	(7,331)			(3,843)			(19,010)	(11,531)
Net income available to common stockholders, basic	$ 100,006			$ 116,552			$ 265,841	$ 393,640
Denominator
Weighted-average common shares outstanding (in shares)	114,122,512			113,778,533			114,071,951	113,647,585
Basic earnings per share (in dollars per share)	$ 0.88			$ 1.02			$ 2.33	$ 3.46
Numerator
Net income	$ 107,337	$ 93,422	$ 84,092	$ 120,395	$ 147,625	$ 137,151	$ 284,851	$ 405,171
Preferred stock dividends	(7,331)			(3,843)			(19,010)	(11,531)
Net income available to common stockholders, diluted	$ 100,006			$ 116,552			$ 265,841	$ 393,640
Denominator
Basic (in shares)	114,122,512			113,778,533			114,071,951	113,647,585
Weighted-average effect of dilutive securities (in shares)	259,109			172,569			343,218	281,190
Number of shares used in per share computation	114,381,621			113,951,102			114,415,169	113,928,775
Diluted earnings per share (in dollars per share)	$ 0.87			$ 1.02			$ 2.32	$ 3.46