Goodwill and Other Intangible Assets - Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Beginning balance	$ 939,683	$ 939,683
Additions to goodwill and other adjustments		0
Ending balance	991,708	939,683
Southeastern Commercial Finance, LLC Acquisition
Goodwill [Roll Forward]
Additions to goodwill and other adjustments	6,608
Continental Republic Capital Acquisition
Goodwill [Roll Forward]
Additions to goodwill and other adjustments	45,417
Community Banks
Goodwill [Roll Forward]
Beginning balance	936,916	936,916
Additions to goodwill and other adjustments		0
Ending balance	988,941	936,916
Community Banks | Southeastern Commercial Finance, LLC Acquisition
Goodwill [Roll Forward]
Additions to goodwill and other adjustments	6,608
Community Banks | Continental Republic Capital Acquisition
Goodwill [Roll Forward]
Additions to goodwill and other adjustments	45,417
Insurance
Goodwill [Roll Forward]
Beginning balance	2,767	2,767
Additions to goodwill and other adjustments		0
Ending balance	2,767	$ 2,767
Insurance | Southeastern Commercial Finance, LLC Acquisition
Goodwill [Roll Forward]
Additions to goodwill and other adjustments	0
Insurance | Continental Republic Capital Acquisition
Goodwill [Roll Forward]
Additions to goodwill and other adjustments	$ 0