Loans, Allowance for Credit Losses, and Asset Quality Information - Schedule of Activity in Allowance for Loan Losses for Loans (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 90,967	$ 78,789	$ 78,789
"Day 1" ACL for acquired PCD loans	5,610
Charge-offs	(2,621)	(1,043)	(4,465)
Recoveries	989	823	4,043
Provisions/(Reversals)	11,451	3,500	12,600
Ending balance	106,396	82,069	90,967
Commercial, financial, and agricultural
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	17,718	16,249	16,249
"Day 1" ACL for acquired PCD loans	5,197
Charge-offs	(2,177)	(790)	(2,519)
Recoveries	274	247	756
Provisions/(Reversals)	2,061	307	3,232
Ending balance	23,073	16,013	17,718
Real estate, commercial | Real estate – construction, land development & other land loans
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	15,128	16,519	16,519
"Day 1" ACL for acquired PCD loans	49
Charge-offs	0	0	0
Recoveries	65	137	480
Provisions/(Reversals)	3,744	(599)	(1,871)
Ending balance	18,986	16,057	15,128
Real estate, commercial | Real estate mortgage – commercial and other
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	40,709	30,342	30,342
"Day 1" ACL for acquired PCD loans	242
Charge-offs	(235)	(45)	(1,063)
Recoveries	434	155	1,983
Provisions/(Reversals)	4,126	6,875	9,447
Ending balance	45,276	37,327	40,709
Real estate, mortgage | Real estate mortgage – residential (1-4 family) first mortgages
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	11,354	8,686	8,686
"Day 1" ACL for acquired PCD loans	113
Charge-offs	0	0	0
Recoveries	146	4	17
Provisions/(Reversals)	672	(531)	2,651
Ending balance	12,285	8,159	11,354
Real estate, mortgage | Real estate mortgage – home equity loans / lines of credit
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,158	4,337	4,337
"Day 1" ACL for acquired PCD loans	8
Charge-offs	(2)	(41)	(43)
Recoveries	34	233	600
Provisions/(Reversals)	283	(2,455)	(1,736)
Ending balance	3,481	2,074	3,158
Consumer loans
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2,900	2,656	2,656
"Day 1" ACL for acquired PCD loans	1
Charge-offs	(207)	(167)	(840)
Recoveries	36	47	207
Provisions/(Reversals)	565	(97)	877
Ending balance	$ 3,295	$ 2,439	$ 2,900