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]	Series C Preferred Stock	Series D Preferred Stock	Series E Preferred Stock	Series F Preferred Stock [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]	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, 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)
Beginning balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2019			$ (98,337)															$ (98,337)
Preferred stock shares outstanding, beginning balance (in shares) at Dec. 31, 2019											264,000	264,000
Common stock shares outstanding, beginning balance (in shares) at Dec. 31, 2019													175,216,000	175,216,000
Comprehensive income:
Net income		306,771															306,771
Other Comprehensive Income, Other, Net of Tax		45,801																		45,801
Other comprehensive income		45,801																		45,801
Comprehensive income		352,572
Common stock issued:
Stock-based compensation plans, net		3,966													(17,663)		0					21,629
Purchase of Treasury Stock					$ (6,113)	$ (71,255)																		$ (6,113)	$ (71,255)
Cash dividends
Common stock dividends		(112,023)															(112,023)
Preferred stock dividends	[1]	(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
Other																						0
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													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	[2]	(17,111)															(17,111)
Stock-based compensation expense, net		15,591													15,591
Other																						0
Ending balance at Dec. 31, 2021		4,024,853									193,195		$ 1,752		1,713,851		2,672,601			(10,317)		(546,229)
Ending balance (Cumulative Effect, Period of Adoption, Adjusted Balance [Member]) at Dec. 31, 2021		4,026,566									$ 193,195		$ 1,752		1,713,851		2,674,314			(10,317)		(546,229)
Ending balance (Cumulative Effect, Period of Adoption, Adjustment [Member]) at Dec. 31, 2021		$ 1,713															1,713
Preferred stock shares outstanding, ending balance (in shares) at Dec. 31, 2021											200,000
Preferred stock shares outstanding, ending balance (in shares) (Cumulative Effect, Period of Adoption, Adjusted Balance [Member]) at Dec. 31, 2021											200,000
Common stock shares outstanding, ending balance (in shares) at Dec. 31, 2021		149,342,641											175,216,000
Common stock shares outstanding, ending balance (in shares) (Cumulative Effect, Period of Adoption, Adjusted Balance [Member]) at Dec. 31, 2021													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
Net income		$ 366,122															366,122
Other comprehensive income		(262,483)																		(262,483)
Comprehensive income		103,639
Stock-based compensation plans, net		11,061													(17,397)							28,458
Purchase of Treasury Stock					$ (6,480)																			$ (6,480)
Common stock dividends		(123,137)															(123,137)
Preferred stock dividends	[3]	(11,500)															(11,500)
Stock-based compensation expense, net		16,280													16,280
Other		(938)									$ 916						(916)					(938)
Ending balance at Dec. 31, 2022		$ 4,015,490									$ 194,112		$ 1,752		$ 1,712,733		$ 2,904,882			$ (272,799)		$ (525,190)
Preferred stock shares outstanding, ending balance (in shares) at Dec. 31, 2022											200,000
Common stock shares outstanding, ending balance (in shares) at Dec. 31, 2022		150,444,019											175,216,000
Cash dividends
Preferred Stock, Dividends, Per Share, Cash Paid									$ 1.46875	$ 1.40625

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

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

[3] (c) Series E, $1.46875 per share; and Series F, $1.40625 per share. (d) MSRs at December 31, 2021 were carried at LOCOM. On January 1, 2022, the Corporation made the irrevocable election to account for MSRs at fair value.