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Loans and Asset Quality Information (Schedule of Information of Loans Modified in Troubled Debt Restructuring) (Details) - All Total Loans [Member] $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($)
Information related to loans modified in a troubled debt restructuring: |  |
Number of contracts, TDRs | 1 | 3
Pre-Modification Restructured Balances, TDRs | $ 55 | $ 315
Post-Modification Restructured Balances, TDRs | $ 55 | $ 325
Commercial, financial, and agricultural [Member] |  |
Information related to loans modified in a troubled debt restructuring: |  |
Number of contracts, TDRs Accruing |  |
Pre-Modification Restructured Balances, TDRs - Accruing |  |
Post-Modification Restructured Balances, TDRs - Accruing |  |
Number of contracts, TDRs Nonaccrual |  |
Pre-Modification Restructured Balances, TDRs Nonaccrual |  |
Post-Modification Restructured Balances, TDRs Nonaccrual |  |
Real estate - construction, land development & other land loans [Member] |  |
Information related to loans modified in a troubled debt restructuring: |  |
Number of contracts, TDRs Accruing |  |
Pre-Modification Restructured Balances, TDRs - Accruing |  |
Post-Modification Restructured Balances, TDRs - Accruing |  |
Number of contracts, TDRs Nonaccrual |  | 1
Pre-Modification Restructured Balances, TDRs Nonaccrual |  | $ 61
Post-Modification Restructured Balances, TDRs Nonaccrual |  | $ 61
Real estate - mortgage - residential (1-4 family) first mortgages [Member] |  |
Information related to loans modified in a troubled debt restructuring: |  |
Number of contracts, TDRs Accruing |  |
Pre-Modification Restructured Balances, TDRs - Accruing |  |
Post-Modification Restructured Balances, TDRs - Accruing |  |
Number of contracts, TDRs Nonaccrual | 1 | 2
Pre-Modification Restructured Balances, TDRs Nonaccrual | $ 55 | $ 254
Post-Modification Restructured Balances, TDRs Nonaccrual | $ 55 | $ 264
Real estate - mortgage - home equity loans / lines of credit [Member] |  |
Information related to loans modified in a troubled debt restructuring: |  |
Number of contracts, TDRs Accruing |  |
Pre-Modification Restructured Balances, TDRs - Accruing |  |
Post-Modification Restructured Balances, TDRs - Accruing |  |
Number of contracts, TDRs Nonaccrual |  |
Pre-Modification Restructured Balances, TDRs Nonaccrual |  |
Post-Modification Restructured Balances, TDRs Nonaccrual |  |
Real estate - mortgage - commercial and other [Member] |  |
Information related to loans modified in a troubled debt restructuring: |  |
Number of contracts, TDRs Accruing |  |
Pre-Modification Restructured Balances, TDRs - Accruing |  |
Post-Modification Restructured Balances, TDRs - Accruing |  |
Number of contracts, TDRs Nonaccrual |  |
Pre-Modification Restructured Balances, TDRs Nonaccrual |  |
Post-Modification Restructured Balances, TDRs Nonaccrual |  |
Installment loans to individuals [Member] |  |
Information related to loans modified in a troubled debt restructuring: |  |
Number of contracts, TDRs Accruing |  |
Pre-Modification Restructured Balances, TDRs - Accruing |  |
Post-Modification Restructured Balances, TDRs - Accruing |  |
Number of contracts, TDRs Nonaccrual |  |
Pre-Modification Restructured Balances, TDRs Nonaccrual |  |
Post-Modification Restructured Balances, TDRs Nonaccrual |  |

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