Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Series F Preferred Stock	Series G Preferred Stock	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings [Member] Series F Preferred Stock	Retained Earnings [Member] Series G Preferred Stock	Treasury Stock, Common	Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning Balance at Dec. 31, 2022	$ 8,056,186	$ (4,245)			$ 283,979	$ 1,828	$ 6,173,240	$ 2,713,861	$ (4,245)			$ (431,762)	$ (684,960)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	221,004							221,004
Other comprehensive (loss), net of tax	96,940												96,940
Common stock dividends and equivalents	(69,712)							(69,712)
Preferred stock dividends			$ (1,969)	$ (2,194)						$ (1,969)	$ (2,194)
Stock-based compensation	11,646						(33,471)					45,117
Exercise of stock options	1,723						(2,026)					3,749
Common shares acquired from stock compensation plan activity	(15,085)											(15,085)
Ending Balance at Mar. 31, 2023	8,294,294				283,979	1,828	6,137,743	2,856,745				(397,981)	(588,020)
Beginning Balance at Dec. 31, 2023	8,689,996				283,979	1,828	6,179,753	3,282,530				(507,523)	(550,571)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	216,323							216,323
Other comprehensive (loss), net of tax	(65,530)												(65,530)
Common stock dividends and equivalents	(68,989)							(68,989)
Preferred stock dividends			$ (1,969)	$ (2,194)						$ (1,969)	$ (2,194)
Stock-based compensation	13,760						(40,818)					54,578
Common shares acquired from stock compensation plan activity	(13,496)											(13,496)
Common stock repurchase program	(20,403)											(20,403)
Ending Balance at Mar. 31, 2024	$ 8,747,498				$ 283,979	$ 1,828	$ 6,138,935	$ 3,425,701				$ (486,844)	$ (616,101)