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Loans and Asset Quality Information (Schedule of Nonaccrual Loans) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
--- | --- | --- | ---
Company's nonaccrual loans: |  |  |
Nonaccrual loans | $ 20,684 | $ 22,575 | $ 21,849
Commercial, financial, and agricultural [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 980 | 919 |
Real estate construction, land development & other land loans [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 1,677 | 2,265 |
Real estate mortgage residential (1-4 family) first mortgages [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 9,958 | 10,115 |
Real estate mortgage home equity loans / lines of credit [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 1,632 | 1,685 |
Real estate mortgage commercial and other [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 6,280 | 7,452 |
Installment loans to individuals [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | $ 157 | $ 139 |

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