Loans and Allowance for Loan Losses - Impairment Methodology (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for loan losses:
Individually evaluated for impairment	$ 5,113	$ 615
Collectively evaluated for impairment	13,000	11,862
Total	18,113	12,477	$ 11,652	$ 10,852
Loans outstanding:
Individually evaluated for impairment	37,335	7,395
Collectively evaluated for impairment	1,249,632	1,161,402
Total	1,286,967	1,168,797
Commercial, financial, and agricultural
Allowance for loan losses:
Individually evaluated for impairment	2,187	311
Collectively evaluated for impairment	2,934	2,607
Total	5,121	2,918	3,237	3,325
Loans outstanding:
Individually evaluated for impairment	7,552	1,514
Collectively evaluated for impairment	265,366	197,508
Total	272,918	199,022
Residential real estate \| Construction
Allowance for loan losses:
Individually evaluated for impairment	27
Collectively evaluated for impairment	186	64
Total	213	64	140	170
Loans outstanding:
Individually evaluated for impairment	192
Collectively evaluated for impairment	29,500	23,035
Total	29,692	23,035
Residential real estate \| Mortgages
Allowance for loan losses:
Individually evaluated for impairment	263	264
Collectively evaluated for impairment	2,416	1,854
Total	2,679	2,118	2,071	1,689
Loans outstanding:
Individually evaluated for impairment	3,626	3,856
Collectively evaluated for impairment	258,713	248,787
Total	262,339	252,643
Commercial real estate \| Construction
Allowance for loan losses:
Individually evaluated for impairment	28
Collectively evaluated for impairment	447	369
Total	475	369	757	807
Loans outstanding:
Individually evaluated for impairment	200	137
Collectively evaluated for impairment	77,944	84,861
Total	78,144	84,998
Commercial real estate \| Mortgages
Allowance for loan losses:
Individually evaluated for impairment	2,594	23
Collectively evaluated for impairment	6,760	6,524
Total	9,354	6,547	4,914	4,437
Loans outstanding:
Individually evaluated for impairment	25,657	1,711
Collectively evaluated for impairment	591,476	574,924
Total	617,133	576,635
Installment and other consumer
Allowance for loan losses:
Individually evaluated for impairment	14	17
Collectively evaluated for impairment	250	364
Total	264	381	334	345
Loans outstanding:
Individually evaluated for impairment	108	177
Collectively evaluated for impairment	26,633	32,287
Total	26,741	32,464
Unallocated
Allowance for loan losses:
Collectively evaluated for impairment	7	80
Total	$ 7	$ 80	$ 199	$ 79

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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