Loans - Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Credit quality categories
Total ending loans balance	$ 1,817,343		$ 1,817,343		$ 1,639,083
Current period gross write offs
Total	216	$ 160	933	$ 610
Pass
Credit quality categories
Total ending loans balance					1,618,973
Special Mention
Credit quality categories
Total ending loans balance					4,917
Substandard
Credit quality categories
Total ending loans balance					15,193
Commercial, financial, and agricultural
Credit quality categories
2023	34,288		34,288
2022	53,761		53,761
2021	42,405		42,405
2020	33,324		33,324
2019	9,224		9,224
Prior	7,679		7,679
Revolving Loans	29,925		29,925
Revolving Loans Converted to Term	867		867
Total ending loans balance	211,473		211,473		190,461
Current period gross write offs
2023			0
2022			0
2021			0
2020			0
2019			0
Prior			0
Revolving Loans			0
Revolving Loans Converted to Term			0
Total	0	18	0	18
Commercial, financial, and agricultural | Pass
Credit quality categories
2023	34,288		34,288
2022	53,560		53,560
2021	42,363		42,363
2020	33,239		33,239
2019	9,224		9,224
Prior	6,756		6,756
Revolving Loans	29,212		29,212
Revolving Loans Converted to Term	114		114
Total ending loans balance	208,756		208,756		184,783
Commercial, financial, and agricultural | Special Mention
Credit quality categories
2023	0		0
2022	201		201
2021	42		42
2020	0		0
2019	0		0
Prior	168		168
Revolving Loans	223		223
Revolving Loans Converted to Term	0		0
Total ending loans balance	634		634		125
Commercial, financial, and agricultural | Substandard
Credit quality categories
2023	0		0
2022	0		0
2021	0		0
2020	85		85
2019	0		0
Prior	755		755
Revolving Loans	490		490
Revolving Loans Converted to Term	753		753
Total ending loans balance	2,083		2,083		5,553
Real Estate Mortgages | Residential
Credit quality categories
2023	117,468		117,468
2022	219,087		219,087
2021	120,411		120,411
2020	70,364		70,364
2019	45,930		45,930
Prior	18,836		18,836
Revolving Loans	51,814		51,814
Revolving Loans Converted to Term	129,872		129,872
Total ending loans balance	773,782		773,782		708,209
Current period gross write offs
Total	0	0	81	15
Real Estate Mortgages | Residential | Pass
Credit quality categories
2023	117,468		117,468
2022	218,678		218,678
2021	120,137		120,137
2020	70,364		70,364
2019	45,930		45,930
Prior	17,038		17,038
Revolving Loans	51,814		51,814
Revolving Loans Converted to Term	129,802		129,802
Total ending loans balance	771,231		771,231		705,515
Real Estate Mortgages | Residential | Special Mention
Credit quality categories
2023	0		0
2022	409		409
2021	274		274
2020	0		0
2019	0		0
Prior	0		0
Revolving Loans	0		0
Revolving Loans Converted to Term	0		0
Total ending loans balance	683		683		266
Real Estate Mortgages | Residential | Substandard
Credit quality categories
2023	0		0
2022	0		0
2021	0		0
2020	0		0
2019	0		0
Prior	1,798		1,798
Revolving Loans	0		0
Revolving Loans Converted to Term	70		70
Total ending loans balance	1,868		1,868		2,428
Current period gross write offs
2023			0
2022			0
2021			0
2020			0
2019			0
Prior			9
Revolving Loans			72
Revolving Loans Converted to Term			0
Total			81
Real Estate Mortgages | Commercial
Credit quality categories
2023	43,594		43,594
2022	105,217		105,217
2021	136,025		136,025
2020	50,535		50,535
2019	25,976		25,976
Prior	152,801		152,801
Revolving Loans	10,827		10,827
Revolving Loans Converted to Term	691		691
Total ending loans balance	525,666		525,666		500,632
Current period gross write offs
Total	0	0	62	155
Real Estate Mortgages | Commercial | Pass
Credit quality categories
2023	43,594		43,594
2022	105,217		105,217
2021	134,960		134,960
2020	50,535		50,535
2019	25,913		25,913
Prior	147,471		147,471
Revolving Loans	10,827		10,827
Revolving Loans Converted to Term	691		691
Total ending loans balance	519,208		519,208		488,993
Real Estate Mortgages | Commercial | Special Mention
Credit quality categories
2023	0		0
2022	0		0
2021	1,065		1,065
2020	0		0
2019	0		0
Prior	48		48
Revolving Loans	0		0
Revolving Loans Converted to Term	0		0
Total ending loans balance	1,113		1,113		4,526
Real Estate Mortgages | Commercial | Substandard
Credit quality categories
2023	0		0
2022	0		0
2021	0		0
2020	0		0
2019	63		63
Prior	5,282		5,282
Revolving Loans	0		0
Revolving Loans Converted to Term	0		0
Total ending loans balance	5,345		5,345		7,113
Current period gross write offs
2023			59
2022			0
2021			0
2020			0
2019			0
Prior			3
Revolving Loans			0
Revolving Loans Converted to Term			0
Total			62
Real Estate Mortgages | Construction
Credit quality categories
2023	21,093		21,093
2022	13,072		13,072
2021	15,045		15,045
2020	1,417		1,417
2019	402		402
Prior	4,543		4,543
Revolving Loans	261		261
Revolving Loans Converted to Term	0		0
Total ending loans balance	55,833		55,833		43,308
Current period gross write offs
Total	0	0	0	0
Real Estate Mortgages | Construction | Pass
Credit quality categories
2023	21,093		21,093
2022	13,072		13,072
2021	15,045		15,045
2020	1,417		1,417
2019	402		402
Prior	4,452		4,452
Revolving Loans	261		261
Revolving Loans Converted to Term	0		0
Total ending loans balance	55,742		55,742		43,209
Real Estate Mortgages | Construction | Special Mention
Credit quality categories
2023	0		0
2022	0		0
2021	0		0
2020	0		0
2019	0		0
Prior	0		0
Revolving Loans	0		0
Revolving Loans Converted to Term	0		0
Total ending loans balance	0		0		0
Real Estate Mortgages | Construction | Substandard
Credit quality categories
2023	0		0
2022	0		0
2021	0		0
2020	0		0
2019	0		0
Prior	91		91
Revolving Loans	0		0
Revolving Loans Converted to Term	0		0
Total ending loans balance	91		91		99
Current period gross write offs
2023			0
2022			0
2021			0
2020			0
2019			0
Prior			0
Revolving Loans			0
Revolving Loans Converted to Term			0
Total			0
Consumer automobile loans
Credit quality categories
2023	101,214		101,214
2022	85,276		85,276
2021	21,969		21,969
2020	17,486		17,486
2019	8,716		8,716
Prior	5,107		5,107
Revolving Loans	0		0
Revolving Loans Converted to Term	0		0
Total ending loans balance	239,768		239,768		186,112
Current period gross write offs
Total	130	57	507	234
Consumer automobile loans | Pass
Credit quality categories
2023	101,214		101,214
2022	85,276		85,276
2021	21,969		21,969
2020	17,486		17,486
2019	8,716		8,716
Prior	5,107		5,107
Revolving Loans	0		0
Revolving Loans Converted to Term	0		0
Total ending loans balance	239,768		239,768		186,112
Consumer automobile loans | Special Mention
Credit quality categories
2023	0		0
2022	0		0
2021	0		0
2020	0		0
2019	0		0
Prior	0		0
Revolving Loans	0		0
Revolving Loans Converted to Term	0		0
Total ending loans balance	0		0		0
Consumer automobile loans | Substandard
Credit quality categories
2023	0		0
2022	0		0
2021	0		0
2020	0		0
2019	0		0
Prior	0		0
Revolving Loans	0		0
Revolving Loans Converted to Term	0		0
Total ending loans balance	0		0		0
Current period gross write offs
2023			0
2022			247
2021			136
2020			112
2019			6
Prior			7
Revolving Loans			0
Revolving Loans Converted to Term			0
Total			508
Other consumer installment loans
Credit quality categories
2023	2,609		2,609
2022	2,406		2,406
2021	1,291		1,291
2020	558		558
2019	427		427
Prior	3,486		3,486
Revolving Loans	0		0
Revolving Loans Converted to Term	44		44
Total ending loans balance	10,821		10,821		10,361
Current period gross write offs
Total	86	$ 85	283	$ 188
Other consumer installment loans | Pass
Credit quality categories
2023	2,609		2,609
2022	2,406		2,406
2021	1,291		1,291
2020	558		558
2019	427		427
Prior	3,486		3,486
Revolving Loans	0		0
Revolving Loans Converted to Term	44		44
Total ending loans balance	10,821		10,821		10,361
Current period gross write offs
2023			179
2022			28
2021			20
2020			6
2019			6
Prior			19
Revolving Loans			13
Revolving Loans Converted to Term			11
Total			282
Other consumer installment loans | Special Mention
Credit quality categories
2023	0		0
2022	0		0
2021	0		0
2020	0		0
2019	0		0
Prior	0		0
Revolving Loans	0		0
Revolving Loans Converted to Term	0		0
Total ending loans balance	0		0		0
Other consumer installment loans | Substandard
Credit quality categories
2023	0		0
2022	0		0
2021	0		0
2020	0		0
2019	0		0
Prior	0		0
Revolving Loans	0		0
Revolving Loans Converted to Term	0		0
Total ending loans balance	$ 0		$ 0		$ 0