CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Preferred Series A	Preferred Series B	Common Stock	Preferred Stock	Preferred Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Surplus	Surplus 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 Preferred Series A	Retained Earnings Preferred Series B	Retained Earnings Common Stock	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock	Treasury Stock Cumulative Effect, Period of Adoption, Adjusted Balance
Beginning balance at Dec. 31, 2021	$ 5,084,066						$ 209,691		$ 148,482		$ 3,883,035		$ 883,645						$ (17,932)		$ (22,855)
Beginning balance (in shares) at Dec. 31, 2021									421,437
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	116,728												116,728
Other comprehensive income (loss), net of tax	(38,166)																		(38,166)
Cash dividends declared:
Cash dividends declared on preferred stock				$ (1,797)	$ (1,375)											$ (1,797)	$ (1,375)
Cash dividends declared on common stock						$ (46,803)												$ (46,803)
Effect of stock incentive plan, net (in shares)									972
Effect of stock incentive plan, net	(2,752)										(10,799)		(5,173)								13,220
Purchase of treasury stock (in shares)									(1,015)
Purchase of treasury stock	(13,517)																				(13,517)
Ending balance at Mar. 31, 2022	5,096,384						209,691		$ 148,482		3,872,236		945,225						(56,098)		(23,152)
Ending balance (in shares) at Mar. 31, 2022									421,394
Beginning balance at Dec. 31, 2022	6,400,802	$ 990	$ 6,401,792				209,691	$ 209,691	$ 178,185	$ 178,185	4,980,231	$ 4,980,231	1,218,445	$ 990	$ 1,219,435				(164,002)	$ (164,002)	(21,748)	$ (21,748)
Beginning balance (in shares) at Dec. 31, 2022									506,374	506,374
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	146,551												146,551
Other comprehensive income (loss), net of tax	20,355																		20,355
Cash dividends declared:
Cash dividends declared on preferred stock				$ (1,797)	$ (2,077)											$ (1,797)	$ (2,077)
Cash dividends declared on common stock						$ (56,488)												$ (56,488)
Effect of stock incentive plan, net (in shares)									1,061
Effect of stock incentive plan, net	(505)								$ 1		(12,569)		(3,994)								16,057
Common stock issued (in shares)									327
Common stock issued	3,750												(650)								4,400
Ending balance at Mar. 31, 2023	$ 6,511,581						$ 209,691		$ 178,186		$ 4,967,662		$ 1,300,980						$ (143,647)		$ (1,291)
Ending balance (in shares) at Mar. 31, 2023									507,762
Cash dividends declared:
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2022-02 [Member]