CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Allowance for PCD loans (2)	Cumulative Effect, Period of Adoption, Adjusted Balance	Series A Preferred Stock	Series B Preferred Stock	Common Stock	Preferred Stock	Preferred Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock Common Stock	Surplus	Surplus Cumulative Effect, Period of Adoption, Adjusted Balance	Surplus Common Stock	Retained Earnings	Retained Earnings Allowance for PCD loans (2)	Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings Series A Preferred Stock	Retained Earnings Series B Preferred Stock	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, 2019	$ 4,384,188		$ 4,356,001				$ 209,691	$ 209,691	$ 141,423	$ 141,423		$ 3,622,208	$ 3,622,208		$ 443,559		$ 415,372				$ (32,214)	$ (32,214)	$ (479)	$ (479)
Beginning balance (ASU 2016-02) at Dec. 31, 2019		$ (28,187)														$ (28,187)
Beginning balance (in shares) at Dec. 31, 2019									403,278	403,278
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	390,606														390,606
Other comprehensive income,  net of tax	24,496																				24,496
Cash dividends declared:
Cash dividends declared on preferred stock				$ (7,188)	$ (5,500)													$ (7,188)	$ (5,500)
Cash dividends declared on common stock						$ (179,277)														$ (179,277)
Effect of stock incentive plan, net (in shares)									581
Effect of stock incentive plan, net	12,982								$ 323			15,260			(2,855)								254
Ending balance at Dec. 31, 2020	4,592,120						209,691		$ 141,746			3,637,468			611,158	$ (47,300)					(7,718)		(225)
Ending balance (in shares) at Dec. 31, 2020									403,859
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	473,840														473,840
Other comprehensive income,  net of tax	(10,214)																				(10,214)
Cash dividends declared:
Cash dividends declared on preferred stock				(7,188)	(5,500)													(7,188)	(5,500)
Cash dividends declared on common stock						(182,370)														(182,370)
Effect of stock incentive plan, net (in shares)									3,484
Effect of stock incentive plan, net	35,358								$ 1,238			39,931			(6,295)								484
Common stock issued (in shares)											15,709
Common stock issued in acquisition						211,134					$ 5,498			$ 205,636
Purchase of treasury stock (in shares)									(1,615)
Purchase of treasury stock	(23,114)																						(23,114)
Ending balance at Dec. 31, 2021	5,084,066						209,691		$ 148,482			3,883,035			883,645						(17,932)		(22,855)
Ending balance (in shares) at Dec. 31, 2021									421,437
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	568,851														568,851
Other comprehensive income,  net of tax	(146,070)																				(146,070)
Cash dividends declared:
Cash dividends declared on preferred stock				$ (7,188)	$ (5,958)													$ (7,188)	$ (5,958)
Cash dividends declared on common stock						(215,513)														$ (215,513)
Effect of stock incentive plan, net (in shares)									1,089
Effect of stock incentive plan, net	18,302								$ 1			9,069			(5,392)								14,624
Common stock issued (in shares)											84,863
Common stock issued in acquisition						$ 1,117,829					$ 29,702			$ 1,088,127
Purchase of treasury stock (in shares)									(1,015)
Purchase of treasury stock	(13,517)																						(13,517)
Ending balance at Dec. 31, 2022	$ 6,400,802						$ 209,691		$ 178,185			$ 4,980,231			$ 1,218,445						$ (164,002)		$ (21,748)
Ending balance (in shares) at Dec. 31, 2022									506,374