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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, 2018 | Dec. 31, 2017
Impaired loans |  |
Impaired loans with no related allowance - Recorded Investment | $ 8,918 | $ 11,565
Impaired loans with no related allowance - Unpaid Principal Balance | 10,329 | 13,802
Impaired loans with no related allowance - Average Recorded Investment | 11,888 | 13,461
Impaired loans with allowance - Recorded Investment | 15,335 | 15,650
Impaired loans with allowance - Unpaid Principal Balance | 15,484 | 15,893
Impaired loans with related allowance - Related Allowance | 2,269 | 1,564
Impaired loans with related allowance - Average Recorded Investment | 15,867 | 16,229
Commercial, financial, and agricultural [Member] |  |
Impaired loans |  |
Impaired loans with no related allowance - Recorded Investment | 310 | 183
Impaired loans with no related allowance - Unpaid Principal Balance | 310 | 425
Impaired loans with no related allowance - Average Recorded Investment | 957 | 276
Impaired loans with allowance - Recorded Investment | 386 | 396
Impaired loans with allowance - Unpaid Principal Balance | 387 | 396
Impaired loans with related allowance - Related Allowance | 226 | 215
Impaired loans with related allowance - Average Recorded Investment | 422 | 214
Real estate - construction, land development & other land loans [Member] |  |
Impaired loans |  |
Impaired loans with no related allowance - Recorded Investment | 485 | 2,743
Impaired loans with no related allowance - Unpaid Principal Balance | 803 | 3,941
Impaired loans with no related allowance - Average Recorded Investment | 2,366 | 2,846
Impaired loans with allowance - Recorded Investment | 860 | 232
Impaired loans with allowance - Unpaid Principal Balance | 864 | 241
Impaired loans with related allowance - Related Allowance | 134 | 18
Impaired loans with related allowance - Average Recorded Investment | 385 | 503
Real estate - mortgage - residential (1-4 family) first mortgages [Member] |  |
Impaired loans |  |
Impaired loans with no related allowance - Recorded Investment | 4,626 | 5,205
Impaired loans with no related allowance - Unpaid Principal Balance | 4,948 | 5,728
Impaired loans with no related allowance - Average Recorded Investment | 4,804 | 7,067
Impaired loans with allowance - Recorded Investment | 7,765 | 9,595
Impaired loans with allowance - Unpaid Principal Balance | 7,904 | 9,829
Impaired loans with related allowance - Related Allowance | 955 | 1,099
Impaired loans with related allowance - Average Recorded Investment | 8,963 | 10,077
Real estate - mortgage - home equity loans / lines of credit [Member] |  |
Impaired loans |  |
Impaired loans with no related allowance - Recorded Investment | 22 | 368
Impaired loans with no related allowance - Unpaid Principal Balance | 31 | 387
Impaired loans with no related allowance - Average Recorded Investment | 91 | 129
Impaired loans with allowance - Recorded Investment | 274 |
Impaired loans with allowance - Unpaid Principal Balance | 275 |
Impaired loans with related allowance - Related Allowance | 48 |
Impaired loans with related allowance - Average Recorded Investment | 184 | 66
Real estate - mortgage - commercial and other [Member] |  |
Impaired loans |  |
Impaired loans with no related allowance - Recorded Investment | 3,475 | 3,066
Impaired loans with no related allowance - Unpaid Principal Balance | 4,237 | 3,321
Impaired loans with no related allowance - Average Recorded Investment | 3,670 | 3,143
Impaired loans with allowance - Recorded Investment | 6,050 | 5,427
Impaired loans with allowance - Unpaid Principal Balance | 6,054 | 5,427
Impaired loans with related allowance - Related Allowance | 906 | 232
Impaired loans with related allowance - Average Recorded Investment | 5,911 | 5,369
Installment loans to individuals [Member] |  |
Impaired loans |  |
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 |  |
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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