Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Common Stock	Surplus	Retained Earnings	Accumulated Other Comprehensive (Loss) Gain	Total
Balance at Dec. 31, 2020	$ 177,434	$ 3,765,406	$ 657,451	$ 47,589	$ 4,647,880
Balance (in shares) at Dec. 31, 2020	70,973,477
Increase (Decrease) in Stockholders' Equity
Net Income (Loss)			475,543		475,543
Other comprehensive income (loss), net of tax effects				(68,735)	(68,735)
Total comprehensive income (loss)					406,808
Cash dividends declared on common stock per share			(135,201)		(135,201)
Cash dividends equivalents paid on restricted stock units			(136)		(136)
Employee stock purchases	$ 83	2,301			2,384
Employee stock purchases (in shares)	33,013
Stock options exercised	$ 160	2,745			2,905
Stock options exercised (in shares)	64,075
Stock issued pursuant to restricted stock units	$ 233	(233)
Stock issued pursuant to restricted stock units (in shares)	93,085
Common stock repurchased - buyback plan	$ (4,545)	(141,823)			(146,368)
Common stock repurchased - buyback plan (in shares)	(1,817,941)
Common stock repurchased - equity plans	$ (34)	(1,019)			(1,053)
Common stock repurchased - equity plans (in shares)	(13,412)
Share-based compensation expense		25,721			25,721
Balance at Dec. 31, 2021	$ 173,331	3,653,098	997,657	(21,146)	4,802,940
Balance (in shares) at Dec. 31, 2021	69,332,297
Increase (Decrease) in Stockholders' Equity
Net Income (Loss)			496,049		496,049
Other comprehensive income (loss), net of tax effects				(655,942)	(655,942)
Total comprehensive income (loss)					(159,893)
Cash dividends declared on common stock per share			(146,486)		(146,486)
Cash dividends equivalents paid on restricted stock units			(178)		(178)
Employee stock purchases	$ 96	2,762			2,858
Employee stock purchases (in shares)	38,491
Stock options exercised	$ 97	1,488			1,585
Stock options exercised (in shares)	39,020
Restricted stock awards (forfeits)	$ (13)	13
Restricted stock awards (forfeits) (in shares)	(5,368)
Stock issued pursuant to restricted stock units	$ 984	(983)			1
Stock issued pursuant to restricted stock units (in shares)	393,747
Common stock repurchased - buyback plan	$ (3,280)	(106,924)			(110,204)
Common stock repurchased - buyback plan (in shares)	(1,312,038)
Common stock repurchased - equity plans	$ (281)	(8,845)			(9,126)
Common stock repurchased - equity plans (in shares)	(112,389)
Share-based compensation expense		35,638			35,638
Common stock issued for Atlantic Capital merger	$ 18,327	641,445			659,772
Common stock issued for Atlantic Capital merger (in shares)	7,330,803
Net fair value of unvested equity awards assumed in the Atlantic Capital acquisition		(1,980)			(1,980)
Balance at Dec. 31, 2022	$ 189,261	4,215,712	1,347,042	(677,088)	$ 5,074,927
Balance (in shares) at Dec. 31, 2022	75,704,563				75,704,563
Increase (Decrease) in Stockholders' Equity
Net Income (Loss)			494,308		$ 494,308
Other comprehensive income (loss), net of tax effects				94,552	94,552
Total comprehensive income (loss)					588,860
Cash dividends declared on common stock per share			(154,919)		(154,919)
Cash dividends equivalents paid on restricted stock units			(1,265)		(1,265)
Employee stock purchases	$ 108	2,664			2,772
Employee stock purchases (in shares)	43,356
Stock options exercised	$ 133	2,793			2,926
Stock options exercised (in shares)	53,225
Restricted stock awards (forfeits)	$ (8)	8
Restricted stock awards (forfeits) (in shares)	(2,721)
Stock issued pursuant to restricted stock units	$ 1,140	(1,140)
Stock issued pursuant to restricted stock units (in shares)	455,443
Common stock repurchased - buyback plan	$ (250)	(6,498)			(6,748)
Common stock repurchased - buyback plan (in shares)	(100,000)
Common stock repurchased - equity plans	$ (329)	(8,987)			(9,316)
Common stock repurchased - equity plans (in shares)	(131,827)
Share-based compensation expense		35,861			35,861
Balance at Dec. 31, 2023	$ 190,055	$ 4,240,413	$ 1,685,166	$ (582,536)	$ 5,533,098
Balance (in shares) at Dec. 31, 2023	76,022,039				76,022,039