Loans and Asset Quality Information - Schedule of Information of Loans Modified in Troubled Debt Restructuring (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) contract	Dec. 31, 2019 USD ($) contract	Dec. 31, 2018 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	12	6	6
Pre- Modification Restructured Balances	$ 6,338	$ 1,056	$ 655
Post- Modification Restructured Balances	$ 6,341	$ 1,060	$ 684
Commercial, financial, and agricultural | TDRs – Accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	2	2	0
Pre- Modification Restructured Balances	$ 143	$ 395	$ 0
Post- Modification Restructured Balances	$ 143	$ 395	$ 0
Commercial, financial, and agricultural | TDRs – Nonaccrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	1	0	0
Pre- Modification Restructured Balances	$ 72	$ 0	$ 0
Post- Modification Restructured Balances	$ 72	$ 0	$ 0
Real estate, commercial | Real estate – construction, land development & other land loans | TDRs – Accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	1	0	0
Pre- Modification Restructured Balances	$ 67	$ 0	$ 0
Post- Modification Restructured Balances	$ 67	$ 0	$ 0
Real estate, commercial | Real estate – construction, land development & other land loans | TDRs – Nonaccrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	0	0	1
Pre- Modification Restructured Balances	$ 0	$ 0	$ 61
Post- Modification Restructured Balances	$ 0	$ 0	$ 61
Real estate, commercial | Real estate – mortgage – commercial and other | TDRs – Accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	0	1	0
Pre- Modification Restructured Balances	$ 0	$ 274	$ 0
Post- Modification Restructured Balances	$ 0	$ 274	$ 0
Real estate, commercial | Real estate – mortgage – commercial and other | TDRs – Nonaccrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	5	0	0
Pre- Modification Restructured Balances	$ 5,977	$ 0	$ 0
Post- Modification Restructured Balances	$ 5,977	$ 0	$ 0
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages | TDRs – Accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	2	3	2
Pre- Modification Restructured Balances	$ 75	$ 387	$ 254
Post- Modification Restructured Balances	$ 78	$ 391	$ 273
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages | TDRs – Nonaccrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	0	0	3
Pre- Modification Restructured Balances	$ 0	$ 0	$ 340
Post- Modification Restructured Balances	$ 0	$ 0	$ 350
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit | TDRs – Accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	0	0	0
Pre- Modification Restructured Balances	$ 0	$ 0	$ 0
Post- Modification Restructured Balances	$ 0	$ 0	$ 0
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit | TDRs – Nonaccrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	0	0	0
Pre- Modification Restructured Balances	$ 0	$ 0	$ 0
Post- Modification Restructured Balances	$ 0	$ 0	$ 0
Installment loans to individuals | TDRs – Accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	1	0	0
Pre- Modification Restructured Balances	$ 4	$ 0	$ 0
Post- Modification Restructured Balances	$ 4	$ 0	$ 0
Installment loans to individuals | TDRs – Nonaccrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	0	0	0
Pre- Modification Restructured Balances	$ 0	$ 0	$ 0
Post- Modification Restructured Balances	$ 0	$ 0	$ 0