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, 2022	Mar. 31, 2021	Dec. 31, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 78,789	$ 52,388	$ 52,388
Allowance for acquired PCD loans			4,895
Charge-offs	(1,043)	(2,317)	(7,602)
Recoveries	823	1,203	4,922
Provisions/(Reversals)	3,500	0	9,611
Ending balance	82,069	65,849	78,789
Cumulative Effect, Period Of Adoption, Adjustment
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		14,575	14,575
Commercial, financial, and agricultural
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	16,249	11,316	11,316
Allowance for acquired PCD loans			2,917
Charge-offs	(790)	(1,438)	(3,722)
Recoveries	247	514	1,744
Provisions/(Reversals)	307	147	927
Ending balance	16,013	13,606	16,249
Commercial, financial, and agricultural | Cumulative Effect, Period Of Adoption, Adjustment
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		3,067	3,067
Real estate, commercial | Real estate – construction, land development & other land loans
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	16,519	5,355	5,355
Allowance for acquired PCD loans			165
Charge-offs	0	(66)	(245)
Recoveries	137	294	948
Provisions/(Reversals)	(599)	(1,589)	4,156
Ending balance	16,057	10,134	16,519
Real estate, commercial | Real estate – construction, land development & other land loans | Cumulative Effect, Period Of Adoption, Adjustment
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		6,140	6,140
Real estate, commercial | Real estate – mortgage – commercial and other
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	30,342	23,603	23,603
Allowance for acquired PCD loans			1,489
Charge-offs	(45)	(510)	(2,295)
Recoveries	155	262	533
Provisions/(Reversals)	6,875	3,409	7,269
Ending balance	37,327	26,507	30,342
Real estate, commercial | Real estate – mortgage – commercial and other | Cumulative Effect, Period Of Adoption, Adjustment
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		(257)	(257)
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	8,686	8,048	8,048
Allowance for acquired PCD loans			222
Charge-offs	0	(38)	(273)
Recoveries	4	87	761
Provisions/(Reversals)	(531)	(1,685)	(2,656)
Ending balance	8,159	8,996	8,686
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages | Cumulative Effect, Period Of Adoption, Adjustment
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		2,584	2,584
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4,337	2,375	2,375
Allowance for acquired PCD loans			92
Charge-offs	(41)	(131)	(400)
Recoveries	233	11	578
Provisions/(Reversals)	(2,455)	(526)	(888)
Ending balance	2,074	4,309	4,337
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit | Cumulative Effect, Period Of Adoption, Adjustment
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		2,580	2,580
Consumer loans
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2,656	1,478	1,478
Allowance for acquired PCD loans			10
Charge-offs	(167)	(134)	(667)
Recoveries	47	35	358
Provisions/(Reversals)	(97)	244	803
Ending balance	2,439	2,297	2,656
Consumer loans | Cumulative Effect, Period Of Adoption, Adjustment
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		674	674
Unallocated
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	0	213	213
Allowance for acquired PCD loans			0
Charge-offs	0	0	0
Recoveries	0	0	0
Provisions/(Reversals)	0	0	0
Ending balance	$ 0	0	0
Unallocated | Cumulative Effect, Period Of Adoption, Adjustment
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		$ (213)	$ (213)