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Loans and Asset Quality Information (Schedule of Impaired Loans) (Details) - All Total Loans [Member] - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment | $ 9,312 | $ 8,918
Impaired loans with no related allowance - Unpaid Principal Balance | 10,761 | 10,329
Impaired loans with no related allowance - Average Recorded Investment | 9,115 | 11,888
Loans with an allowance recorded: |  |
Impaired loans with allowance - Recorded Investment | 11,837 | 15,335
Impaired loans with allowance - Unpaid Principal Balance | 12,655 | 15,484
Impaired loans with related allowance - Related Allowance | 2,055 | 2,269
Impaired loans with related allowance - Average Recorded Investment | 13,586 | 15,867
Commercial, financial, and agricultural [Member] |  |
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment | 28 | 310
Impaired loans with no related allowance - Unpaid Principal Balance | 29 | 310
Impaired loans with no related allowance - Average Recorded Investment | 169 | 957
Loans with an allowance recorded: |  |
Impaired loans with allowance - Recorded Investment | 1,016 | 386
Impaired loans with allowance - Unpaid Principal Balance | 1,016 | 387
Impaired loans with related allowance - Related Allowance | 857 | 226
Impaired loans with related allowance - Average Recorded Investment | 701 | 422
Real estate - construction, land development & other land loans [Member] |  |
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment | 458 | 485
Impaired loans with no related allowance - Unpaid Principal Balance | 782 | 803
Impaired loans with no related allowance - Average Recorded Investment | 472 | 2,366
Loans with an allowance recorded: |  |
Impaired loans with allowance - Recorded Investment | 339 | 860
Impaired loans with allowance - Unpaid Principal Balance | 339 | 864
Impaired loans with related allowance - Related Allowance | 28 | 134
Impaired loans with related allowance - Average Recorded Investment | 599 | 385
Real estate - mortgage - residential (1-4 family) first mortgages [Member] |  |
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment | 4,789 | 4,626
Impaired loans with no related allowance - Unpaid Principal Balance | 5,112 | 4,948
Impaired loans with no related allowance - Average Recorded Investment | 4,708 | 4,804
Loans with an allowance recorded: |  |
Impaired loans with allowance - Recorded Investment | 6,102 | 7,765
Impaired loans with allowance - Unpaid Principal Balance | 6,303 | 7,904
Impaired loans with related allowance - Related Allowance | 858 | 955
Impaired loans with related allowance - Average Recorded Investment | 6,934 | 8,963
Real estate - mortgage - home equity loans / lines of credit [Member] |  |
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment | 21 | 22
Impaired loans with no related allowance - Unpaid Principal Balance | 30 | 31
Impaired loans with no related allowance - Average Recorded Investment | 21 | 91
Loans with an allowance recorded: |  |
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 | 137 | 184
Real estate - mortgage - commercial and other [Member] |  |
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment | 4,016 | 3,475
Impaired loans with no related allowance - Unpaid Principal Balance | 4,808 | 4,237
Impaired loans with no related allowance - Average Recorded Investment | 3,745 | 3,670
Loans with an allowance recorded: |  |
Impaired loans with allowance - Recorded Investment | 4,380 | 6,050
Impaired loans with allowance - Unpaid Principal Balance | 4,998 | 6,054
Impaired loans with related allowance - Related Allowance | 312 | 906
Impaired loans with related allowance - Average Recorded Investment | 5,215 | 5,911
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 |  |

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