Loans, Allowance for Credit Losses, and Asset Quality Information - Schedule of Recorded Investment in Loans by Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	$ 485,995	$ 2,380,302
Year two	2,301,564	1,329,007
Year three	1,137,969	637,027
Year four	568,755	396,981
Year five	356,537	317,729
Prior	694,898	478,114
Revolving	519,908	544,259
Total	6,065,626	6,083,419
Unamortized net deferred loan fees	(928)	(1,704)
Total loans	6,064,698	6,081,715
Commercial, financial, and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total	603,454	648,997
Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	5,115	14,960
Year two	29,545	25,508
Year three	6,464	2,965
Year four	2,314	1,730
Year five	1,407	673
Prior	940	550
Revolving	11,037	10,852
Total	56,822	57,238
Commercial, financial, and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	36,099	206,779
Year two	179,748	140,588
Year three	106,995	74,385
Year four	69,392	76,470
Year five	72,513	16,745
Prior	30,271	17,597
Revolving	108,436	116,433
Total	603,454	648,997
Real estate – construction, land development & other land loans | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	114,984	575,195
Year two	488,473	134,674
Year three	95,445	74,208
Year four	64,975	12,648
Year five	9,434	9,882
Prior	12,734	8,196
Revolving	9,841	13,746
Total	795,886	828,549
Real estate – mortgage – residential (1-4 family) first mortgages | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	53,416	242,926
Year two	278,294	225,388
Year three	207,002	121,148
Year four	116,193	83,945
Year five	77,422	87,050
Prior	303,418	249,433
Revolving	9,422	12,076
Total	1,045,167	1,021,966
Real estate – mortgage – home equity loans / lines of credit | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	372	3,380
Year two	2,608	595
Year three	506	525
Year four	374	1,304
Year five	1,254	245
Prior	2,589	2,275
Revolving	321,645	323,608
Total	329,348	331,932
Real estate – mortgage – commercial and other | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	276,009	1,337,062
Year two	1,322,896	802,254
Year three	721,557	363,796
Year four	315,507	220,884
Year five	194,507	203,134
Prior	344,946	200,063
Revolving	59,527	67,544
Total	3,234,949	3,194,737
Pass [Member] | Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	5,115	14,960
Year two	29,404	25,431
Year three	6,453	2,965
Year four	2,313	1,722
Year five	1,407	673
Prior	923	525
Revolving	10,998	10,810
Total	56,613	57,086
Pass [Member] | Commercial, financial, and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	35,980	204,945
Year two	177,169	138,540
Year three	105,179	71,369
Year four	66,635	66,645
Year five	62,972	16,009
Prior	29,478	17,492
Revolving	105,225	112,933
Total	582,638	627,933
Pass [Member] | Real estate – construction, land development & other land loans | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	113,568	573,613
Year two	488,287	133,888
Year three	94,674	69,066
Year four	59,914	12,455
Year five	9,256	9,764
Prior	12,619	8,190
Revolving	9,836	13,737
Total	788,154	820,713
Pass [Member] | Real estate – mortgage – residential (1-4 family) first mortgages | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	53,280	241,619
Year two	277,391	224,617
Year three	206,074	120,097
Year four	114,970	82,531
Year five	76,281	86,074
Prior	290,677	234,950
Revolving	8,318	11,051
Total	1,026,991	1,000,939
Pass [Member] | Real estate – mortgage – home equity loans / lines of credit | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	306	3,111
Year two	2,258	498
Year three	410	439
Year four	299	1,304
Year five	1,254	245
Prior	2,244	1,649
Revolving	315,092	317,319
Total	321,863	324,565
Pass [Member] | Real estate – mortgage – commercial and other | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	275,364	1,328,156
Year two	1,315,875	796,992
Year three	716,571	355,885
Year four	307,705	211,118
Year five	184,889	197,165
Prior	337,011	197,659
Revolving	57,982	66,104
Total	3,195,397	3,153,079
Special Mention | Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	4
Year three	0	0
Year four	0	0
Year five	0	0
Prior	0	0
Revolving	0	0
Total	0	4
Special Mention | Commercial, financial, and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	225
Year two	125	1,255
Year three	399	1,313
Year four	621	2,729
Year five	2,633	225
Prior	216	9
Revolving	2,504	2,348
Total	6,498	8,104
Special Mention | Real estate – construction, land development & other land loans | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	41
Year two	38	737
Year three	726	5,095
Year four	4,117	110
Year five	107	104
Prior	98	2
Revolving	5	9
Total	5,091	6,098
Special Mention | Real estate – mortgage – residential (1-4 family) first mortgages | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	888
Year two	512	615
Year three	448	516
Year four	328	229
Year five	201	323
Prior	3,331	3,237
Revolving	96	94
Total	4,916	5,902
Special Mention | Real estate – mortgage – home equity loans / lines of credit | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	48	194
Year two	187	0
Year three	0	15
Year four	0	0
Year five	0	0
Prior	18	19
Revolving	1,112	1,341
Total	1,365	1,569
Special Mention | Real estate – mortgage – commercial and other | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	521	1,759
Year two	2,042	4,849
Year three	4,737	5,801
Year four	4,849	3,741
Year five	3,708	2,072
Prior	3,103	1,801
Revolving	1,340	1,440
Total	20,300	21,463
Classified | Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	141	73
Year three	11	0
Year four	1	8
Year five	0	0
Prior	17	25
Revolving	39	42
Total	209	148
Classified | Commercial, financial, and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	119	1,609
Year two	2,454	793
Year three	1,417	1,703
Year four	2,136	7,096
Year five	6,908	511
Prior	577	96
Revolving	707	1,152
Total	14,318	12,960
Classified | Real estate – construction, land development & other land loans | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,416	1,541
Year two	148	49
Year three	45	47
Year four	944	83
Year five	71	14
Prior	17	4
Revolving	0	0
Total	2,641	1,738
Classified | Real estate – mortgage – residential (1-4 family) first mortgages | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	136	419
Year two	391	156
Year three	480	535
Year four	895	1,185
Year five	940	653
Prior	9,410	11,246
Revolving	1,008	931
Total	13,260	15,125
Classified | Real estate – mortgage – home equity loans / lines of credit | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	18	75
Year two	163	97
Year three	96	71
Year four	75	0
Year five	0	0
Prior	327	607
Revolving	5,441	4,948
Total	6,120	5,798
Classified | Real estate – mortgage – commercial and other | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	124	7,147
Year two	4,979	413
Year three	249	2,110
Year four	2,953	6,025
Year five	5,910	3,897
Prior	4,832	603
Revolving	205	0
Total	$ 19,252	$ 20,195