Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands		Total	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	Common Stock [Member]	Surplus	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Treasury Stock Performance/Service Based RSAs, RSA, [Member]	Treasury Stock Board Authorized Purchase Program [Member]
Beginning 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, beginning balance (in shares) at Dec. 31, 2020									364,000
Common stock shares outstanding, beginning balance (in shares) at Dec. 31, 2020										175,216,000
Comprehensive income:
Net income		350,994										350,994
Other Comprehensive Income, Other, Net of Tax		(22,935)											(22,935)
Other comprehensive (loss)		(22,935)											(22,935)
Comprehensive income		328,059
Purchase of preferred stock		(164,458)							$ (160,317)			(4,141)
Common stock issued:
Stock-based compensation plans, net		25,702									(22,069)	0		47,771
Purchase of Treasury Stock			$ (4,847)	$ (132,955)											$ (4,847)	$ (132,955)
Cash dividends
Common stock dividends		(116,061)										(116,061)
Preferred stock dividends		(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)
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										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 (loss)		(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	[1]	(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)
Ending balance (Cumulative Effect, Period of Adoption, Adjustment [Member]) at Dec. 31, 2022		1,713										1,713
Ending balance (Cumulative Effect, Period of Adoption, Adjusted Balance [Member]) at Dec. 31, 2022		$ 4,026,566							$ 193,195	$ 1,752	1,713,851	2,674,314	(10,317)	(546,229)
Preferred stock shares outstanding, ending balance (in shares) at Dec. 31, 2022									200,000
Preferred stock shares outstanding, ending balance (in shares) (Cumulative Effect, Period of Adoption, Adjusted Balance [Member]) at Dec. 31, 2022									200,000
Common stock shares outstanding, ending balance (in shares) at Dec. 31, 2022		150,444,019								175,216,000
Common stock shares outstanding, ending balance (in shares) (Cumulative Effect, Period of Adoption, Adjusted Balance [Member]) at Dec. 31, 2022										175,216,000
Cash dividends
Preferred Stock, Dividends, Per Share, Cash Paid							1.46875	1.40625
Net income		$ 182,956										182,956
Other comprehensive (loss)		101,703											101,703
Comprehensive income		284,659
Stock-based compensation plans, net		4,297									(15,065)			19,362
Purchase of Treasury Stock			$ (6,593)												$ (6,593)
Common stock dividends		(129,534)										(129,534)
Preferred stock dividends	[2]	(11,500)										(11,500)
Stock-based compensation expense, net		17,155									17,155
Other														0
Ending balance at Dec. 31, 2023		$ 4,173,973							$ 194,112	$ 1,752	$ 1,714,822	$ 2,946,805	$ (171,096)	$ (512,421)
Preferred stock shares outstanding, ending balance (in shares) at Dec. 31, 2023									200,000
Common stock shares outstanding, ending balance (in shares) at Dec. 31, 2023		151,036,674								175,216,000
Cash dividends
Preferred Stock, Dividends, Per Share, Cash Paid							$ 1.46875	$ 1.40625

[1] (a) 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. (b) 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.

[2] (c) Series E, $1.46875 per share; and Series F, $1.40625 per share.