Loans and Allowance for Loan Losses - Past Due and Non-accrual Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Aging information for the Company's past due and non-accrual loans
Loans held for investment	$ 1,333,923	$ 1,302,133
90 Days Past Due And Still Accruing	3	14
Non-Accrual	17,096	25,459
Current or Less Than 30 Days Past Due
Aging information for the Company's past due and non-accrual loans
Loans held for investment	1,315,897	1,275,604
30 - 89 Days Past Due
Aging information for the Company's past due and non-accrual loans
Loans held for investment	927	1,056
Commercial, Financial, & Agricultural
Aging information for the Company's past due and non-accrual loans
Loans held for investment	221,015	217,214
90 Days Past Due And Still Accruing	0	0
Non-Accrual	136	153
Commercial, Financial, & Agricultural | Current or Less Than 30 Days Past Due
Aging information for the Company's past due and non-accrual loans
Loans held for investment	220,703	217,058
Commercial, Financial, & Agricultural | 30 - 89 Days Past Due
Aging information for the Company's past due and non-accrual loans
Loans held for investment	176	3
Residential real estate | Construction
Aging information for the Company's past due and non-accrual loans
Loans held for investment	21,515	27,920
90 Days Past Due And Still Accruing	0	0
Non-Accrual	0	0
Residential real estate | Construction | Current or Less Than 30 Days Past Due
Aging information for the Company's past due and non-accrual loans
Loans held for investment	21,513	27,920
Residential real estate | Construction | 30 - 89 Days Past Due
Aging information for the Company's past due and non-accrual loans
Loans held for investment	2	0
Residential real estate | Mortgages
Aging information for the Company's past due and non-accrual loans
Loans held for investment	287,879	279,346
90 Days Past Due And Still Accruing	0	14
Non-Accrual	1,258	1,129
Residential real estate | Mortgages | Current or Less Than 30 Days Past Due
Aging information for the Company's past due and non-accrual loans
Loans held for investment	286,007	277,532
Residential real estate | Mortgages | 30 - 89 Days Past Due
Aging information for the Company's past due and non-accrual loans
Loans held for investment	614	671
Commercial real estate | Construction
Aging information for the Company's past due and non-accrual loans
Loans held for investment	103,478	91,369
90 Days Past Due And Still Accruing	0	0
Non-Accrual	100	105
Commercial real estate | Construction | Current or Less Than 30 Days Past Due
Aging information for the Company's past due and non-accrual loans
Loans held for investment	103,339	91,264
Commercial real estate | Construction | 30 - 89 Days Past Due
Aging information for the Company's past due and non-accrual loans
Loans held for investment	39	0
Commercial real estate | Mortgages
Aging information for the Company's past due and non-accrual loans
Loans held for investment	677,539	663,256
90 Days Past Due And Still Accruing	0	0
Non-Accrual	15,477	24,029
Commercial real estate | Mortgages | Current or Less Than 30 Days Past Due
Aging information for the Company's past due and non-accrual loans
Loans held for investment	662,062	638,982
Commercial real estate | Mortgages | 30 - 89 Days Past Due
Aging information for the Company's past due and non-accrual loans
Loans held for investment	0	245
Installment and Other Consumer
Aging information for the Company's past due and non-accrual loans
Loans held for investment	22,497	23,028
90 Days Past Due And Still Accruing	3	0
Non-Accrual	125	43
Installment and Other Consumer | Current or Less Than 30 Days Past Due
Aging information for the Company's past due and non-accrual loans
Loans held for investment	22,273	22,848
Installment and Other Consumer | 30 - 89 Days Past Due
Aging information for the Company's past due and non-accrual loans
Loans held for investment	$ 96	$ 137