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Loans and Asset Quality Information (Schedule of Nonaccrual Loans) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Company's nonaccrual loans: |  |
Nonaccrual loans | $ 20,968 | $ 27,468
Commercial, financial, and agricultural [Member] |  |
Company's nonaccrual loans: |  |
Nonaccrual loans | 1,001 | 1,842
Real estate - construction, land development & other land loans |  |
Company's nonaccrual loans: |  |
Nonaccrual loans | 1,822 | 2,945
Real estate residential, farmland and mutli-family [Member] |  |
Company's nonaccrual loans: |  |
Nonaccrual loans | 12,201 | 16,017
Real estate home equity lines of credit [Member] |  |
Company's nonaccrual loans: |  |
Nonaccrual loans | 2,524 | 2,355
Real estate - mortgage - commercial and other [Member] |  |
Company's nonaccrual loans: |  |
Nonaccrual loans | 3,345 | 4,208
Non-covered loans to Individual |  |
Company's nonaccrual loans: |  |
Nonaccrual loans | 75 | 101
Covered [Member] |  |
Company's nonaccrual loans: |  |
Nonaccrual loans | $ 20,968 | $ 27,468

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