Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands		Total	Cumulative Effect, Period of Adoption, Adjustment [Member]	Accounting Standards Update 2016-13 [Member]	Performance/Service Based RSAs, RSA, [Member]	Board Authorized Purchase Program [Member]	Preferred Equity	Preferred Equity Accounting Standards Update 2016-13 [Member]	Common Stock [Member]	Common Stock [Member] Accounting Standards Update 2016-13 [Member]	Surplus	Surplus Accounting Standards Update 2016-13 [Member]	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment [Member]	Retained Earnings Accounting Standards Update 2016-13 [Member]	Retained Earnings Series C Preferred Stock	Retained Earnings Series D Preferred Stock	Retained Earnings Series E Preferred Stock	Retained Earnings Series F Preferred Stock [Member]	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Accounting Standards Update 2016-13 [Member]	Treasury Stock	Treasury Stock Accounting Standards Update 2016-13 [Member]	Treasury Stock Performance/Service Based RSAs, RSA, [Member]	Treasury Stock Board Authorized Purchase Program [Member]
Beginning balance at Dec. 31, 2018		$ 3,780,888					$ 256,716		$ 1,752		$ 1,712,615		$ 2,181,414							$ (124,972)		$ (246,638)
Preferred stock shares outstanding, beginning balance (in shares) at Dec. 31, 2018							264,000
Common stock shares outstanding, beginning balance (in shares) at Dec. 31, 2018									175,216,000
Comprehensive income:
Net income		326,790											326,790
Other Comprehensive Income, Other, Net of Tax		91,789																		91,789
Other comprehensive income		91,789																		91,789
Comprehensive income		418,579
Common stock issued:
Stock-based compensation plans, net		11,216									(21,038)		0									32,254
Purchase of Treasury Stock					$ (8,592)	$ (177,484)																		$ (8,592)	$ (177,484)
Cash dividends
Common stock dividends		(111,804)											(111,804)
Preferred stock dividends	[1]	(15,202)											(15,202)
Stock-based compensation expense, net		24,854									24,854
Other		(331)											(331)
Ending balance at Dec. 31, 2019		3,922,124		$ 3,823,787			$ 256,716	$ 256,716	$ 1,752	$ 1,752	1,716,431	$ 1,716,431	2,380,867		$ 2,282,530					(33,183)	$ (33,183)	(400,460)	$ (400,460)
Ending balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2019			$ (98,337)											$ (98,337)
Preferred stock shares outstanding, ending balance (in shares) at Dec. 31, 2019							264,000	264,000
Common stock shares outstanding, ending balance (in shares) at Dec. 31, 2019									175,216,000	175,216,000
Cash dividends
Preferred Stock, Dividends, Per Share, Cash Paid																$ 1.53125	$ 1.34375	$ 1.46875
Net income		306,771											306,771
Other comprehensive income		45,801																		45,801
Comprehensive income		352,572
Stock-based compensation plans, net		3,966									(17,663)											21,629
Purchase of Treasury Stock					(6,113)	(71,255)																		(6,113)	(71,255)
Common stock dividends		(112,023)											(112,023)
Preferred stock dividends	[2]	(18,358)											(18,358)
Issuance of preferred stock							100,000
Issuance of preferred stock		96,796					$ 96,796
Stock-based compensation expense, net		21,561									21,561
Ending balance at Dec. 31, 2020		$ 4,090,933					$ 353,512		$ 1,752		1,720,329		2,458,920							12,618		(456,198)
Preferred stock shares outstanding, ending balance (in shares) at Dec. 31, 2020							364,000
Common stock shares outstanding, ending balance (in shares) at Dec. 31, 2020		153,540,224							175,216,000
Cash dividends
Preferred Stock, Dividends, Per Share, Cash Paid																1.53125	1.34375	1.46875	$ 0.7881181
Net income		$ 350,994											350,994
Other comprehensive income		(22,935)																		(22,935)
Comprehensive income		328,059
Purchase of preferred stock		(164,458)					$ (160,317)						(4,141)
Stock-based compensation plans, net		25,702									(22,069)											47,771
Purchase of Treasury Stock					$ (4,847)	$ (132,955)																		$ (4,847)	$ (132,955)
Common stock dividends		(116,061)											(116,061)
Preferred stock dividends	[3]	(17,111)											(17,111)
Stock-based compensation expense, net		15,591									15,591
Ending balance at Dec. 31, 2021		$ 4,024,853					$ 193,195		$ 1,752		$ 1,713,851		$ 2,672,601							$ (10,317)		$ (546,229)
Preferred stock shares outstanding, ending balance (in shares) at Dec. 31, 2021							200,000
Common stock shares outstanding, ending balance (in shares) at Dec. 31, 2021		149,342,641							175,216,000
Cash dividends
Purchase of preferred stock							(164,000)
Preferred Stock, Dividends, Per Share, Cash Paid																$ 0.70252	$ 0.95613	$ 1.46875	$ 1.40625

[1] (a) Series C, $1.53125 per share; Series D, $1.34375 per share; and Series E, $1.46875 per share.

[2] (b) Series C, $1.53125 per share; Series D, $1.34375 per share; and Series E, $1.46875 per share; and Series F, $0.7881181 per share.

[3] (c) Series C, $0.70252 per share; Series D, $0.95613 per share; Series E, $1.46875 per share; and Series F, $1.40625 per share.