Loans, Allowance for Credit Losses, and Asset Quality Information - Schedule of Recorded Investment in Loans by Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	$ 436,460		$ 2,200,727
Year two	2,422,053		1,850,445
Year three	1,999,244		897,337
Year four	975,055		444,804
Year five	468,502		957
Prior	728,212		750,041
Revolving	770,713		522,237
Total	7,800,239		6,666,548
Unamortized net deferred loan fees	(1,276)		(1,403)
Total loans, net of deferred loan fees	7,798,963		6,665,145
Total gross charge-offs, year to date
2023	0
2022	129
2021	937
2020	24
2019	299
Prior	651
Revolving	581
Total	2,621	$ 1,043	4,465
Commercial, financial, and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Total	885,032		641,941
Total gross charge-offs, year to date
Total	2,177	790	2,519
Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	4,985		35,726
Year two	18,604		7,977
Year three	8,128		3,613
Year four	3,646		1,057
Year five	1,042		3
Prior	1,041		1,275
Revolving	30,610		11,008
Total	68,056		60,659
Total gross charge-offs, year to date
2023	0
2022	0
2021	11
2020	3
2019	0
Prior	0
Revolving	193
Total	207	167	840
Commercial, financial, and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	31,335		186,243
Year two	192,922		109,822
Year three	136,271		86,566
Year four	92,274		53,970
Year five	57,154		590
Prior	78,850		83,340
Revolving	296,226		121,410
Total	885,032		641,941
Total gross charge-offs, year to date
2023	0
2022	129
2021	691
2020	21
2019	299
Prior	651
Revolving	386
Total	2,177
Real estate – construction, land development & other land loans | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	171,256		556,536
Year two	575,881		267,208
Year three	221,411		46,138
Year four	46,268		31,872
Year five	15,127		0
Prior	10,982		12,866
Revolving	51,101		19,556
Total	1,092,026		934,176
Total gross charge-offs, year to date
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Total	0	0	0
Real estate mortgage – residential (1-4 family) first mortgages | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	70,953		319,234
Year two	378,020		275,134
Year three	317,981		186,433
Year four	205,576		99,388
Year five	103,560		185
Prior	308,012		313,373
Revolving	2,478		2,038
Total	1,386,580		1,195,785
Total gross charge-offs, year to date
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	0
Total	0	0	0
Real estate mortgage – home equity loans / lines of credit | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	637		1,150
Year two	5,703		1,247
Year three	2,004		443
Year four	1,431		324
Year five	311		0
Prior	2,176		2,251
Revolving	330,025		318,311
Total	342,287		323,726
Total gross charge-offs, year to date
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving	2
Total	2	41	43
Real estate mortgage – commercial and other | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	157,294		1,101,838
Year two	1,250,923		1,189,057
Year three	1,313,449		574,144
Year four	625,860		258,193
Year five	291,308		179
Prior	327,151		336,936
Revolving	60,273		49,914
Total	4,026,258		3,510,261
Total gross charge-offs, year to date
2023	0
2022	0
2021	235
2020	0
2019	0
Prior	0
Revolving	0
Total	235	$ 45	1,063
Pass | Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	4,750		35,406
Year two	18,431		7,946
Year three	8,093		3,610
Year four	3,646		1,056
Year five	1,036		3
Prior	1,026		1,250
Revolving	30,541		10,953
Total	67,523		60,224
Pass | Commercial, financial, and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	30,973		185,167
Year two	191,669		107,747
Year three	133,914		85,110
Year four	90,094		51,274
Year five	54,372		590
Prior	72,590		76,588
Revolving	295,435		120,590
Total	869,047		627,066
Pass | Real estate – construction, land development & other land loans | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	170,337		550,752
Year two	570,389		267,096
Year three	221,325		42,421
Year four	46,235		30,973
Year five	15,108		0
Prior	10,720		12,722
Revolving	51,065		19,519
Total	1,085,179		923,483
Pass | Real estate mortgage – residential (1-4 family) first mortgages | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	70,953		317,282
Year two	376,734		274,756
Year three	317,648		186,102
Year four	205,073		98,559
Year five	102,510		185
Prior	297,101		301,885
Revolving	1,770		1,379
Total	1,371,789		1,180,148
Pass | Real estate mortgage – home equity loans / lines of credit | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	624		869
Year two	5,439		1,091
Year three	1,732		349
Year four	1,338		237
Year five	219		0
Prior	1,883		2,020
Revolving	322,004		309,786
Total	333,239		314,352
Pass | Real estate mortgage – commercial and other | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	156,862		1,096,643
Year two	1,245,323		1,186,678
Year three	1,311,892		569,624
Year four	617,132		247,448
Year five	280,085		179
Prior	306,906		324,361
Revolving	59,260		48,882
Total	3,977,460		3,473,815
Special Mention | Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0		0
Year two	0		0
Year three	0		0
Year four	0		0
Year five	0		0
Prior	0		0
Revolving	0		0
Total	0		0
Special Mention | Commercial, financial, and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	362		342
Year two	233		166
Year three	367		648
Year four	529		1,312
Year five	1,164		0
Prior	914		990
Revolving	109		332
Total	3,678		3,790
Special Mention | Real estate – construction, land development & other land loans | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	389		5,128
Year two	5,220		5
Year three	0		3,679
Year four	1		0
Year five	0		0
Prior	102		100
Revolving	12		13
Total	5,724		8,925
Special Mention | Real estate mortgage – residential (1-4 family) first mortgages | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0		1,189
Year two	748		127
Year three	203		110
Year four	106		470
Year five	647		0
Prior	2,110		2,416
Revolving	19		0
Total	3,833		4,312
Special Mention | Real estate mortgage – home equity loans / lines of credit | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0		175
Year two	173		0
Year three	119		0
Year four	0		0
Year five	0		0
Prior	17		18
Revolving	123		1,072
Total	432		1,265
Special Mention | Real estate mortgage – commercial and other | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	243		1,715
Year two	1,617		1,114
Year three	1,016		4,436
Year four	8,473		8,289
Year five	7,327		0
Prior	11,948		4,457
Revolving	652		665
Total	31,276		20,676
Classified | Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	235		320
Year two	173		31
Year three	35		3
Year four	0		1
Year five	6		0
Prior	15		25
Revolving	69		55
Total	533		435
Classified | Commercial, financial, and agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0		734
Year two	1,020		1,909
Year three	1,990		808
Year four	1,651		1,384
Year five	1,618		0
Prior	5,346		5,762
Revolving	682		488
Total	12,307		11,085
Classified | Real estate – construction, land development & other land loans | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	530		656
Year two	272		107
Year three	86		38
Year four	32		899
Year five	19		0
Prior	160		44
Revolving	24		24
Total	1,123		1,768
Classified | Real estate mortgage – residential (1-4 family) first mortgages | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0		763
Year two	538		251
Year three	130		221
Year four	397		359
Year five	403		0
Prior	8,801		9,072
Revolving	689		659
Total	10,958		11,325
Classified | Real estate mortgage – home equity loans / lines of credit | Real estate, mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	13		106
Year two	91		156
Year three	153		94
Year four	93		87
Year five	92		0
Prior	276		213
Revolving	7,898		7,453
Total	8,616		8,109
Classified | Real estate mortgage – commercial and other | Real estate, commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	189		3,480
Year two	3,983		1,265
Year three	541		84
Year four	255		2,456
Year five	3,896		0
Prior	8,297		8,118
Revolving	361		367
Total	$ 17,522		$ 15,770