Loans and Allowance for Loan Losses - Impairment Methodology (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Allowance for loan losses:
Individually evaluated for impairment	$ 1,039	$ 1,194
Collectively evaluated for impairment	10,806	10,458
Total	11,845	11,652	$ 10,947	$ 10,852
Loans outstanding:
Individually evaluated for impairment	8,523	8,478
Collectively evaluated for impairment	1,146,129	1,138,149
Total	1,154,652	1,146,627
Commercial, financial, and agricultural
Allowance for loan losses:
Individually evaluated for impairment	512	551
Collectively evaluated for impairment	2,720	2,686
Total	3,232	3,237	3,261	3,325
Loans outstanding:
Individually evaluated for impairment	2,376	2,428
Collectively evaluated for impairment	202,383	205,292
Total	204,759	207,720
Residential real estate \| Construction
Allowance for loan losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	74	140
Total	74	140	240	170
Loans outstanding:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	26,082	28,610
Total	26,082	28,610
Residential real estate \| Mortgages
Allowance for loan losses:
Individually evaluated for impairment	475	579
Collectively evaluated for impairment	1,415	1,492
Total	1,890	2,071	2,057	1,689
Loans outstanding:
Individually evaluated for impairment	4,851	4,793
Collectively evaluated for impairment	243,208	236,724
Total	248,059	241,517
Commercial real estate \| Construction
Allowance for loan losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	638	757
Total	638	757	895	807
Loans outstanding:
Individually evaluated for impairment	151	153
Collectively evaluated for impairment	109,615	106,631
Total	109,766	106,784
Commercial real estate \| Mortgages
Allowance for loan losses:
Individually evaluated for impairment	25	37
Collectively evaluated for impairment	5,498	4,877
Total	5,523	4,914	4,008	4,437
Loans outstanding:
Individually evaluated for impairment	881	850
Collectively evaluated for impairment	533,240	528,686
Total	534,121	529,536
Installment and other consumer
Allowance for loan losses:
Individually evaluated for impairment	27	27
Collectively evaluated for impairment	306	307
Total	333	334	352	345
Loans outstanding:
Individually evaluated for impairment	264	254
Collectively evaluated for impairment	31,601	32,206
Total	31,865	32,460
Unallocated
Allowance for loan losses:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	155	199
Total	155	199	$ 134	$ 79
Loans outstanding:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	0	0
Total	$ 0	$ 0

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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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The balance of financing receivables that were collectively 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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