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Loans and Asset Quality Information (Schedule of Impaired Loans) (Details) - All Total Loans [Member] - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment | $ 13,647 | $ 11,565
Impaired loans with no related allowance - Unpaid Principal Balance | 15,193 | 13,802
Impaired loans with no related allowance - Average Recorded Investment | 12,631 | 13,461
Loans with an allowance recorded: |  |
Impaired loans with allowance - Recorded Investment | 14,105 | 15,650
Impaired loans with allowance - Unpaid Principal Balance | 14,539 | 15,893
Impaired loans with related allowance - Related Allowance | 1,632 | 1,564
Impaired loans with related allowance - Average Recorded Investment | 16,001 | 16,229
Commercial, financial, and agricultural [Member] |  |
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment | 1,693 | 183
Impaired loans with no related allowance - Unpaid Principal Balance | 2,117 | 425
Impaired loans with no related allowance - Average Recorded Investment | 1,119 | 276
Loans with an allowance recorded: |  |
Impaired loans with allowance - Recorded Investment | 288 | 396
Impaired loans with allowance - Unpaid Principal Balance | 289 | 396
Impaired loans with related allowance - Related Allowance | 126 | 215
Impaired loans with related allowance - Average Recorded Investment | 431 | 214
Real estate - construction, land development & other land loans [Member] |  |
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment | 2,642 | 2,743
Impaired loans with no related allowance - Unpaid Principal Balance | 2,956 | 3,941
Impaired loans with no related allowance - Average Recorded Investment | 2,836 | 2,846
Loans with an allowance recorded: |  |
Impaired loans with allowance - Recorded Investment |  | 232
Impaired loans with allowance - Unpaid Principal Balance |  | 241
Impaired loans with related allowance - Related Allowance |  | 18
Impaired loans with related allowance - Average Recorded Investment | 266 | 503
Real estate - mortgage - residential (1-4 family) first mortgages [Member] |  |
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment | 4,740 | 5,205
Impaired loans with no related allowance - Unpaid Principal Balance | 5,072 | 5,728
Impaired loans with no related allowance - Average Recorded Investment | 4,849 | 7,067
Loans with an allowance recorded: |  |
Impaired loans with allowance - Recorded Investment | 7,877 | 9,595
Impaired loans with allowance - Unpaid Principal Balance | 8,017 | 9,829
Impaired loans with related allowance - Related Allowance | 1,004 | 1,099
Impaired loans with related allowance - Average Recorded Investment | 9,263 | 10,077
Real estate - mortgage - home equity loans / lines of credit [Member] |  |
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment | 22 | 368
Impaired loans with no related allowance - Unpaid Principal Balance | 32 | 387
Impaired loans with no related allowance - Average Recorded Investment | 109 | 129
Loans with an allowance recorded: |  |
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 | 162 | 66
Real estate - mortgage - commercial and other [Member] |  |
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment | 4,550 | 3,066
Impaired loans with no related allowance - Unpaid Principal Balance | 5,016 | 3,321
Impaired loans with no related allowance - Average Recorded Investment | 3,718 | 3,143
Loans with an allowance recorded: |  |
Impaired loans with allowance - Recorded Investment | 5,940 | 5,427
Impaired loans with allowance - Unpaid Principal Balance | 6,233 | 5,427
Impaired loans with related allowance - Related Allowance | 502 | 232
Impaired loans with related allowance - Average Recorded Investment | 5,877 | 5,369
Installment loans to individuals [Member] |  |
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment |  |
Impaired loans with no related allowance - Unpaid Principal Balance |  |
Impaired loans with no related allowance - Average Recorded Investment |  |
Loans with an allowance recorded: |  |
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 | $ 2 |

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