CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Total Equity	Total Equity Cumulative Effect, Period of Adoption, Adjustment	Total Equity Cumulative Effect, Period Of Adoption, Adjusted Balance	Total Equity Series B Preferred Stock	Preferred Stock	Preferred Stock Cumulative Effect, Period Of Adoption, Adjusted Balance	Preferred Stock Series B Preferred Stock	Common Stock	Common Stock Cumulative Effect, Period Of Adoption, Adjusted Balance	Treasury Stock	Treasury Stock Cumulative Effect, Period Of Adoption, Adjusted Balance	Additional Paid-In Capital	Additional Paid-In Capital Cumulative Effect, Period Of Adoption, Adjusted Balance	Additional Paid-In Capital Series B Preferred Stock	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period Of Adoption, Adjusted Balance	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings Cumulative Effect, Period Of Adoption, Adjusted Balance	Retained Earnings Series B Preferred Stock
Beginning balance, shares issued (in shares) at Dec. 31, 2018						4,000,000			449,856,221
Beginning balance (in shares) at Dec. 31, 2018									435,681,488		(14,174,733)
Beginning balance at Dec. 31, 2018		$ 2,972,656				$ 400,000			$ 89,972		$ (142,591)		$ 1,274,635			$ 10,623		$ 1,340,017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 578,276	578,276																578,276
Other comprehensive loss, net of tax	(22,990)	(22,990)														(22,990)
Total comprehensive income	$ 555,286	555,286
Cash dividends:
Common stock		(51,114)																(51,114)
Preferred stock					$ (16,837)																$ (16,837)
Repurchase of Preferred Stock, series B (in shares)	(1,369,630)
Dividend equivalent units related to employee stock-based compensation plans		0											5					(5)
Issuance of common shares (in shares)	3,743,705								3,743,705
Issuance of common shares		3,375							$ 748				2,627
Stock-based compensation expense		30,538											30,363					175
Common stock repurchased (in shares)	(16,962,199)								(16,962,199)		(16,962,199)
Common stock repurchased		(167,201)									$ (167,201)
Shares repurchased related to employee stock-based compensation plans (in shares)									(1,369,630)		(1,369,630)
Shares repurchased related to employee stock-based compensation plans		(14,867)									$ (14,867)
Ending balance (in shares) at Dec. 31, 2019									421,093,364	421,093,364	(32,506,562)	(32,506,562)
Ending balance, shares issued (in shares) at Dec. 31, 2019						4,000,000	4,000,000		453,599,926	453,599,926
Ending balance at Dec. 31, 2019		3,311,836	$ (952,639)	$ 2,359,197		$ 400,000	$ 400,000		$ 90,720	$ 90,720	$ (324,659)	$ (324,659)	1,307,630	$ 1,307,630		(12,367)	$ (12,367)	1,850,512	$ (952,639)	$ 897,873
Cash dividends:
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2016-13
Net income	$ 880,690	880,690																880,690
Other comprehensive loss, net of tax	(21,833)	(21,833)														(21,833)
Total comprehensive income	$ 858,857	858,857
Common stock		(46,351)																(46,351)
Preferred stock					(9,734)																(9,734)
Repurchase of Preferred Stock, series B (in shares)	(1,197,843)							(1,489,304)
Repurchase of Preferred Stock, series B					(68,055)			$ (148,930)							$ 80,875
Dividend equivalent units related to employee stock-based compensation plans		(10)											271					(281)
Issuance of common shares (in shares)	3,129,325								3,129,325
Issuance of common shares		3,602							$ 626				2,976
Stock-based compensation expense		36,586											36,418					168
Common stock repurchased (in shares)	(47,736,847)								(47,736,847)		(47,736,847)
Common stock repurchased		(558,167)									$ (461,244)		(96,923)
Shares repurchased related to employee stock-based compensation plans (in shares)									(1,197,843)		(1,197,843)
Shares repurchased related to employee stock-based compensation plans		(13,090)									$ (13,090)
Ending balance (in shares) at Dec. 31, 2020									375,287,999		(81,441,252)
Ending balance, shares issued (in shares) at Dec. 31, 2020						2,510,696			456,729,251
Ending balance at Dec. 31, 2020	$ 2,562,835	2,562,835				$ 251,070			$ 91,346		$ (798,993)		1,331,247			(34,200)		1,722,365
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,160,513	1,160,513																1,160,513
Other comprehensive loss, net of tax	16,303	16,303														16,303
Total comprehensive income	$ 1,176,816	1,176,816
Cash dividends:
Common stock		(60,462)																(60,462)
Preferred stock					$ (4,736)																$ (4,736)
Repurchase of Preferred Stock, series B (in shares)	(1,368,942)
Dividend equivalent units related to employee stock-based compensation plans		(16)											530					(546)
Issuance of common shares (in shares)	3,786,581								3,786,581
Issuance of common shares		4,891							$ 757				4,134
Stock-based compensation expense		30,649											30,649
Common stock repurchased and cancelled (in shares)									(28,502,460)
Common stock repurchased and cancelled		(472,560)							$ (5,700)				(466,860)
Common stock repurchased (in shares)	(98,748,905)								(70,246,445)		(70,246,445)
Common stock repurchased		(1,067,583)									$ (1,242,267)		174,684
Shares repurchased related to employee stock-based compensation plans (in shares)									(1,368,942)		(1,368,942)
Shares repurchased related to employee stock-based compensation plans		(20,123)									$ (20,123)
Ending balance (in shares) at Dec. 31, 2021									278,956,733		(153,056,639)
Ending balance, shares issued (in shares) at Dec. 31, 2021						2,510,696			432,013,372
Ending balance at Dec. 31, 2021	$ 2,149,711	$ 2,149,711				$ 251,070			$ 86,403		$ (2,061,383)		$ 1,074,384			$ (17,897)		$ 2,817,134