Loans - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Ending allowance balance attributable to loans:
Individually evaluated for impairment			$ 961
Collectively evaluated for impairment			14,676
Total ending allowance balance	$ 12,890	$ 11,592	15,637	$ 15,211	$ 14,393	$ 14,176
Loans:
Individually evaluated for impairment			11,233
Collectively evaluated for impairment			1,627,850
Total ending loans balance	1,817,343		1,639,083
Commercial, financial, and agricultural
Ending allowance balance attributable to loans:
Individually evaluated for impairment			4
Collectively evaluated for impairment			1,910
Total ending allowance balance	3,913	3,019	1,914	2,069	2,108	1,946
Loans:
Individually evaluated for impairment			698
Collectively evaluated for impairment			189,763
Total ending loans balance	211,473		190,461
Real Estate Mortgages | Residential
Ending allowance balance attributable to loans:
Individually evaluated for impairment			111
Collectively evaluated for impairment			4,950
Total ending allowance balance	1,168	1,078	5,061	5,195	4,818	4,701
Loans:
Individually evaluated for impairment			4,321
Collectively evaluated for impairment			703,888
Total ending loans balance	773,782		708,209
Real Estate Mortgages | Commercial
Ending allowance balance attributable to loans:
Individually evaluated for impairment			827
Collectively evaluated for impairment			5,283
Total ending allowance balance	4,323	4,191	6,110	5,536	5,395	5,336
Loans:
Individually evaluated for impairment			6,195
Collectively evaluated for impairment			494,437
Total ending loans balance	525,666		500,632
Real Estate Mortgages | Construction
Ending allowance balance attributable to loans:
Individually evaluated for impairment			0
Collectively evaluated for impairment			188
Total ending allowance balance	198	178	188	210	199	179
Loans:
Individually evaluated for impairment			0
Collectively evaluated for impairment			43,308
Total ending loans balance	55,833		43,308
Consumer automobile loans
Ending allowance balance attributable to loans:
Individually evaluated for impairment			0
Collectively evaluated for impairment			1,617
Total ending allowance balance	2,584	2,446	1,617	1,585	1,307	1,411
Loans:
Individually evaluated for impairment			0
Collectively evaluated for impairment			186,112
Total ending loans balance	239,768		186,112
Other consumer installment loans
Ending allowance balance attributable to loans:
Individually evaluated for impairment			19
Collectively evaluated for impairment			90
Total ending allowance balance	704	680	109	118	110	111
Loans:
Individually evaluated for impairment			19
Collectively evaluated for impairment			10,342
Total ending loans balance	10,821		10,361
Unallocated
Ending allowance balance attributable to loans:
Individually evaluated for impairment			0
Collectively evaluated for impairment			638
Total ending allowance balance	$ 0	$ 0	$ 638	$ 498	$ 456	$ 492