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Loans and Asset Quality Information (Schedule of Impaired Loans) (Details) - All Total Loans [Member] - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Impaired loans |  |
Impaired loans with no related allowance - Recorded Investment | $ 11,565 | $ 18,561
Impaired loans with no related allowance - Unpaid Principal Balance | 13,802 | 22,744
Impaired loans with no related allowance - Average Recorded Investment | 13,461 | 23,770
Impaired loans with allowance - Recorded Investment | 15,650 | 13,665
Impaired loans with allowance - Unpaid Principal Balance | 15,893 | 13,951
Impaired loans with related allowance - Related Allowance | 1,564 | 1,640
Impaired loans with related allowance - Average Recorded Investment | 16,229 | 19,645
Commercial, financial, and agricultural [Member] |  |
Impaired loans |  |
Impaired loans with no related allowance - Recorded Investment | 183 | 593
Impaired loans with no related allowance - Unpaid Principal Balance | 425 | 706
Impaired loans with no related allowance - Average Recorded Investment | 276 | 816
Impaired loans with allowance - Recorded Investment | 396 | 51
Impaired loans with allowance - Unpaid Principal Balance | 396 | 51
Impaired loans with related allowance - Related Allowance | 215 | 7
Impaired loans with related allowance - Average Recorded Investment | 214 | 202
Real estate - construction, land development & other land loans [Member] |  |
Impaired loans |  |
Impaired loans with no related allowance - Recorded Investment | 2,743 | 3,221
Impaired loans with no related allowance - Unpaid Principal Balance | 3,941 | 4,558
Impaired loans with no related allowance - Average Recorded Investment | 2,846 | 3,641
Impaired loans with allowance - Recorded Investment | 232 | 780
Impaired loans with allowance - Unpaid Principal Balance | 241 | 798
Impaired loans with related allowance - Related Allowance | 18 | 184
Impaired loans with related allowance - Average Recorded Investment | 503 | 844
Real estate - mortgage - residential (1-4 family) first mortgages [Member] |  |
Impaired loans |  |
Impaired loans with no related allowance - Recorded Investment | 5,205 | 10,035
Impaired loans with no related allowance - Unpaid Principal Balance | 5,728 | 12,220
Impaired loans with no related allowance - Average Recorded Investment | 7,067 | 11,008
Impaired loans with allowance - Recorded Investment | 9,595 | 10,772
Impaired loans with allowance - Unpaid Principal Balance | 9,829 | 11,007
Impaired loans with related allowance - Related Allowance | 1,099 | 1,339
Impaired loans with related allowance - Average Recorded Investment | 10,077 | 13,314
Real estate - mortgage - home equity loans / lines of credit [Member] |  |
Impaired loans |  |
Impaired loans with no related allowance - Recorded Investment | 368 | 114
Impaired loans with no related allowance - Unpaid Principal Balance | 387 | 146
Impaired loans with no related allowance - Average Recorded Investment | 129 | 139
Impaired loans with allowance - Recorded Investment |  | 166
Impaired loans with allowance - Unpaid Principal Balance |  | 166
Impaired loans with related allowance - Related Allowance |  | 5
Impaired loans with related allowance - Average Recorded Investment | 66 | 324
Real estate - mortgage - commercial and other [Member] |  |
Impaired loans |  |
Impaired loans with no related allowance - Recorded Investment | 3,066 | 4,598
Impaired loans with no related allowance - Unpaid Principal Balance | 3,321 | 5,112
Impaired loans with no related allowance - Average Recorded Investment | 3,143 | 8,165
Impaired loans with allowance - Recorded Investment | 5,427 | 1,896
Impaired loans with allowance - Unpaid Principal Balance | 5,427 | 1,929
Impaired loans with related allowance - Related Allowance | 232 | 105
Impaired loans with related allowance - Average Recorded Investment | 5,369 | 4,912
Installment loans to individuals [Member] |  |
Impaired loans |  |
Impaired loans with no related allowance - Recorded Investment |  |
Impaired loans with no related allowance - Unpaid Principal Balance |  | 2
Impaired loans with no related allowance - Average Recorded Investment |  | 1
Impaired loans with allowance - Recorded Investment |  |
Impaired loans with allowance - Unpaid Principal Balance |  |
Impaired loans with related allowance - Related Allowance |  |
Impaired loans with related allowance - Average Recorded Investment |  | $ 49

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