Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Common Stock	Surplus	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total
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)			219,504		219,504
Other comprehensive income (loss), net of tax effects				(469,738)	(469,738)
Total comprehensive income (loss)					(250,234)
Cash dividends declared on common stock per share			(70,805)		(70,805)
Cash dividends equivalents paid on restricted stock units			(126)		(126)
Employee stock purchases	$ 23	681			704
Employee stock purchases (in shares)	9,078
Stock options exercised	$ 45	692			737
Stock options exercised (in shares)	18,256
Restricted stock awards (forfeits)	$ (3)	3
Restricted stock awards (forfeits) (in shares)	(1,266)
Stock issued pursuant to restricted stock units	$ 912	(911)			1
Stock issued pursuant to restricted stock units (in shares)	364,809
Common stock repurchased - buyback plan	$ (3,280)	(106,924)			(110,204)
Common stock repurchased - buyback plan (in shares)	(1,312,038)
Common stock repurchased	$ (252)	(7,927)			(8,179)
Common stock repurchased (in shares)	(100,617)
Share-based compensation expense		17,799			17,799
Common stock issued for acquisition	$ 18,327	641,445			659,772
Common stock issued for acquisition (in shares)	7,330,803
Net fair value of unvested equity awards assumed in the Atlantic Capital acquisition		(1,980)			(1,980)
Balance at Jun. 30, 2022	$ 189,103	4,195,976	1,146,230	(490,884)	5,040,425
Balance (in shares) at Jun. 30, 2022	75,641,322
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
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
Balance at Mar. 31, 2022	$ 189,403	4,214,897	1,064,064	(293,956)	$ 5,174,408
Balance (in shares) at Mar. 31, 2022	75,761,018
Increase (Decrease) in Stockholders' Equity
Net Income (Loss)			119,175		119,175
Other comprehensive income (loss), net of tax effects				(196,928)	(196,928)
Total comprehensive income (loss)					(77,753)
Cash dividends declared on common stock per share			(36,983)		(36,983)
Cash dividends equivalents paid on restricted stock units			(26)		(26)
Employee stock purchases	$ 23	681			704
Employee stock purchases (in shares)	9,078
Stock options exercised	$ 21	308			329
Stock options exercised (in shares)	8,553
Restricted stock awards (forfeits)	$ (3)	3
Restricted stock awards (forfeits) (in shares)	(1,266)
Stock issued pursuant to restricted stock units	$ 591	(590)			1
Stock issued pursuant to restricted stock units (in shares)	236,507
Common stock repurchased - buyback plan	$ (750)	(22,996)			(23,746)
Common stock repurchased - buyback plan (in shares)	(300,000)
Common stock repurchased	$ (182)	(5,640)			(5,822)
Common stock repurchased (in shares)	(72,568)
Share-based compensation expense		9,313			9,313
Balance at Jun. 30, 2022	$ 189,103	4,195,976	1,146,230	(490,884)	5,040,425
Balance (in shares) at Jun. 30, 2022	75,641,322
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)			263,373		$ 263,373
Other comprehensive income (loss), net of tax effects				14,690	14,690
Total comprehensive income (loss)					278,063
Cash dividends declared on common stock per share			(75,874)		(75,874)
Cash dividends equivalents paid on restricted stock units			(1,033)		(1,033)
Employee stock purchases	$ 24	623			647
Employee stock purchases (in shares)	9,562
Stock options exercised	$ 59	1,114			1,173
Stock options exercised (in shares)	23,516
Restricted stock awards (forfeits)	$ (6)	6
Restricted stock awards (forfeits) (in shares)	(2,353)
Stock issued pursuant to restricted stock units	$ 897	(897)
Stock issued pursuant to restricted stock units (in shares)	358,784
Common stock repurchased	$ (245)	(6,777)			(7,022)
Common stock repurchased (in shares)	(98,093)
Share-based compensation expense		19,129			19,129
Balance at Jun. 30, 2023	$ 189,990	4,228,910	1,533,508	(662,398)	$ 5,290,010
Balance (in shares) at Jun. 30, 2023	75,995,979				75,995,979
Balance at Mar. 31, 2023	$ 189,649	4,224,503	1,448,636	(613,784)	$ 5,249,004
Balance (in shares) at Mar. 31, 2023	75,859,665
Increase (Decrease) in Stockholders' Equity
Net Income (Loss)			123,447		123,447
Other comprehensive income (loss), net of tax effects				(48,614)	(48,614)
Total comprehensive income (loss)					74,833
Cash dividends declared on common stock per share			(37,962)		(37,962)
Cash dividends equivalents paid on restricted stock units			(613)		(613)
Employee stock purchases	$ 24	623			647
Employee stock purchases (in shares)	9,562
Restricted stock awards (forfeits)	$ (1)	1
Restricted stock awards (forfeits) (in shares)	(120)
Stock issued pursuant to restricted stock units	$ 453	(453)
Stock issued pursuant to restricted stock units (in shares)	181,076
Common stock repurchased	$ (135)	(3,471)			(3,606)
Common stock repurchased (in shares)	(54,204)
Share-based compensation expense		7,707			7,707
Balance at Jun. 30, 2023	$ 189,990	$ 4,228,910	$ 1,533,508	$ (662,398)	$ 5,290,010
Balance (in shares) at Jun. 30, 2023	75,995,979				75,995,979