Condensed 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			100,329		100,329
Other comprehensive income (loss), net of tax effects				(272,810)	(272,810)
Total comprehensive income (loss)					(172,481)
Cash dividends declared on common stock per share			(33,822)		(33,822)
Cash dividends equivalents paid on restricted stock units			(100)		(100)
Stock options exercised	$ 24	384			408
Stock options exercised (in shares)	9,703
Stock issued pursuant to restricted stock units	$ 321	(321)
Stock issued pursuant to restricted stock units (in shares)	128,302
Common stock repurchased - buyback plan	$ (2,530)	(83,928)			(86,458)
Common stock repurchased - buyback plan (in shares)	(1,012,038)
Common stock repurchased	$ (70)	(2,287)			(2,357)
Common stock repurchased (in shares)	(28,049)
Share-based compensation expense		8,486			8,486
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 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
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			139,926		$ 139,926
Other comprehensive income (loss), net of tax effects				63,304	63,304
Total comprehensive income (loss)					203,230
Cash dividends declared on common stock per share			(37,912)		(37,912)
Cash dividends equivalents paid on restricted stock units			(420)		(420)
Stock options exercised	$ 59	1,114			1,173
Stock options exercised (in shares)	23,516
Restricted stock awards	$ (5)	5
Restricted stock awards (in shares)	(2,233)
Stock issued pursuant to restricted stock units	$ 444	(444)
Stock issued pursuant to restricted stock units (in shares)	177,708
Common stock repurchased	$ (110)	(3,306)			(3,416)
Common stock repurchased (in shares)	(43,889)
Share-based compensation expense		11,422			11,422
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				75,859,665