Goodwill and Other Intangible Assets - Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Beginning balance	$ 991,708	$ 939,683
Measurement period adjustments to goodwill from the Continental Republic Capital, LLC acquisition	(43)
Ending balance	991,665	991,708
Southeastern Commercial Finance, LLC Acquisition
Goodwill [Roll Forward]
Goodwill acquired during period		6,608
Continental Republic Capital Acquisition
Goodwill [Roll Forward]
Goodwill acquired during period		45,417
Community Banks
Goodwill [Roll Forward]
Beginning balance	988,941	936,916
Measurement period adjustments to goodwill from the Continental Republic Capital, LLC acquisition	(43)
Ending balance	988,898	988,941
Community Banks | Southeastern Commercial Finance, LLC Acquisition
Goodwill [Roll Forward]
Goodwill acquired during period		6,608
Community Banks | Continental Republic Capital Acquisition
Goodwill [Roll Forward]
Goodwill acquired during period		45,417
Insurance
Goodwill [Roll Forward]
Beginning balance	2,767	2,767
Measurement period adjustments to goodwill from the Continental Republic Capital, LLC acquisition	0
Ending balance	$ 2,767	2,767
Insurance | Southeastern Commercial Finance, LLC Acquisition
Goodwill [Roll Forward]
Goodwill acquired during period		0
Insurance | Continental Republic Capital Acquisition
Goodwill [Roll Forward]
Goodwill acquired during period		$ 0