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Loans and Asset Quality Information (Schedule of Information of Loans Modified in Troubled Debt Restructuring) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
All Total Loans [Member] |  |  |  |
Information related to loans modified in a troubled debt restructuring: |  |  |  |
Number of contracts, TDRs |  | 1 | 7 | 1
Pre-Modification Restructured Balances, TDRs |  | $ 1,071 | $ 3,797 | $ 1,071
Post-Modification Restructured Balances, TDRs |  | $ 1,071 | $ 3,772 | $ 1,071
All Total Loans [Member] | Commercial, financial, and agricultural [Member] |  |  |  |
Information related to loans modified in a troubled debt restructuring: |  |  |  |
Number of contracts, TDRs Accruing |  | 1 |  | 1
Pre-Modification Restructured Balances, TDRs - Accruing |  | $ 1,071 |  | $ 1,071
Post-Modification Restructured Balances, TDRs - Accruing |  | $ 1,071 |  | $ 1,071
Number of contracts, TDRs Nonaccrual |  |  |  |
Pre-Modification Restructured Balances, TDRs Nonaccrual |  |  |  |
Post-Modification Restructured Balances, TDRs Nonaccrual |  |  |  |
All Total Loans [Member] | 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 |  |  | $ 32 |
Post-Modification Restructured Balances, TDRs Nonaccrual |  |  | $ 32 |
All Total Loans [Member] | 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 |
Pre-Modification Restructured Balances, TDRs Nonaccrual |  |  | $ 215 |
Post-Modification Restructured Balances, TDRs Nonaccrual |  |  | $ 215 |
All Total Loans [Member] | 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 |  |  |  |
All Total Loans [Member] | Real estate - mortgage - commercial and other [Member] |  |  |  |
Information related to loans modified in a troubled debt restructuring: |  |  |  |
Number of contracts, TDRs Accruing |  |  | 5 |
Pre-Modification Restructured Balances, TDRs - Accruing |  |  | $ 3,550 |
Post-Modification Restructured Balances, TDRs - Accruing |  |  | $ 3,525 |
Number of contracts, TDRs Nonaccrual |  |  |  |
Pre-Modification Restructured Balances, TDRs Nonaccrual |  |  |  |
Post-Modification Restructured Balances, TDRs Nonaccrual |  |  |  |
All Total Loans [Member] | 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 |  |  |  |
Covered [Member] |  |  |  |
Information related to loans modified in a troubled debt restructuring: |  |  |  |
Number of contracts, TDRs |  |  |  |
Pre-Modification Restructured Balances, TDRs |  |  |  |
Post-Modification Restructured Balances, TDRs |  |  |  |

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