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Loans and Asset Quality Information (Schedule of Nonaccrual Loans) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Company's nonaccrual loans: |  |  |
Nonaccrual loans | $ 18,267 | $ 20,968 | $ 23,350
Commercial, financial, and agricultural [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 2,092 | 1,001 |
Real estate construction, land development & other land loans [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 651 | 1,822 |
Real estate mortgage residential (1-4 family) first mortgages [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 8,807 | 12,201 |
Real estate mortgage home equity loans / lines of credit [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 1,419 | 2,524 |
Real estate mortgage commercial and other [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 5,178 | 3,345 |
Installment loans to individuals [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | $ 120 | $ 75 |

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