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Loans and Asset Quality Information (Schedule of Nonaccrual Loans) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
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Company's nonaccrual loans: |  |  |
Nonaccrual loans | $ 23,350 | $ 27,468 | $ 32,796
Commercial, financial, and agricultural [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 996 | 1,842 |
Real estate construction, land development & other land loans [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 1,565 | 2,945 |
Real estate mortgage residential (1-4 family) first mortgages [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 14,878 | 16,017 |
Real estate mortgage home equity loans / lines of credit [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 2,250 | 2,355 |
Real estate mortgage commercial and other [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | 3,534 | 4,208 |
Installment loans to individuals [Member] |  |  |
Company's nonaccrual loans: |  |  |
Nonaccrual loans | $ 127 | $ 101 |

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