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Loans and Asset Quality Information - Schedule of Information of Loans Modified in Troubled Debt Restructuring (Details) $ in Thousands | 12 Months Ended
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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

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