Loans and Allowance for Loan Losses - Credit Quality (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	$ 1,280,615	$ 1,168,797
Watch
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	102,723	78,086
Substandard
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	3,236	6,490
Performing TDRs
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	2,489	2,535
Non-performing TDRs - 90 days past due
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable		106
Non-accrual loans
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	8,849	4,754
Total
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	117,297	91,971
Commercial, financial, and agricultural
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	296,323	199,022
Commercial, financial, and agricultural | Watch
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	19,892	16,288
Commercial, financial, and agricultural | Substandard
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	1,220	3,249
Commercial, financial, and agricultural | Performing TDRs
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	516	532
Commercial, financial, and agricultural | Non-accrual loans
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	3,022	982
Commercial, financial, and agricultural | Total
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	24,650	21,051
Residential real estate | Construction
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	27,188	23,035
Residential real estate | Construction | Watch
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	743	763
Residential real estate | Construction | Substandard
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	0	0
Residential real estate | Construction | Performing TDRs
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	0	0
Residential real estate | Construction | Non-performing TDRs - 90 days past due
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable		0
Residential real estate | Construction | Non-accrual loans
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	0	0
Residential real estate | Construction | Total
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	743	763
Residential real estate | Mortgages
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	250,452	252,643
Residential real estate | Mortgages | Watch
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	14,934	15,280
Residential real estate | Mortgages | Substandard
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	1,426	2,291
Residential real estate | Mortgages | Performing TDRs
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	1,547	1,615
Residential real estate | Mortgages | Non-performing TDRs - 90 days past due
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable		106
Residential real estate | Mortgages | Non-accrual loans
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	3,310	2,135
Residential real estate | Mortgages | Total
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	21,217	21,427
Commercial real estate | Construction
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	85,009	84,998
Commercial real estate | Construction | Watch
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	9,132	8,484
Commercial real estate | Construction | Substandard
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	0	273
Commercial real estate | Construction | Performing TDRs
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	0	0
Commercial real estate | Construction | Non-performing TDRs - 90 days past due
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable		0
Commercial real estate | Construction | Non-accrual loans
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	959	137
Commercial real estate | Construction | Total
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	10,091	8,894
Commercial real estate | Mortgages
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	592,855	576,635
Commercial real estate | Mortgages | Watch
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	58,022	37,271
Commercial real estate | Mortgages | Substandard
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	590	677
Commercial real estate | Mortgages | Performing TDRs
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	345	352
Commercial real estate | Mortgages | Non-accrual loans
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	1,521	1,359
Commercial real estate | Mortgages | Total
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	60,478	39,659
Installment and other consumer
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	28,788	32,464
Installment and other consumer | Watch
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	0	0
Installment and other consumer | Substandard
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	0	0
Installment and other consumer | Performing TDRs
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	81	36
Installment and other consumer | Non-performing TDRs - 90 days past due
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable		0
Installment and other consumer | Non-accrual loans
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	37	141
Installment and other consumer | Total
Credit quality of the loan portfolio using internal rating system reflecting management's risk assessment
Financing receivable	$ 118	$ 177