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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, 2017 | Dec. 31, 2016
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment | $ 11,694 | $ 18,561
Impaired loans with no related allowance - Unpaid Principal Balance | 13,950 | 22,744
Impaired loans with no related allowance - Average Recorded Investment | 13,936 | 23,770
Loans with an allowance recorded: |  |
Impaired loans with allowance - Recorded Investment | 16,350 | 13,665
Impaired loans with allowance - Unpaid Principal Balance | 16,661 | 13,951
Impaired loans with related allowance - Related Allowance | 1,583 | 1,640
Impaired loans with related allowance - Average Recorded Investment | 16,374 | 19,645
Commercial, financial, and agricultural [Member] |  |
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment | 185 | 593
Impaired loans with no related allowance - Unpaid Principal Balance | 425 | 706
Impaired loans with no related allowance - Average Recorded Investment | 299 | 816
Loans with an allowance recorded: |  |
Impaired loans with allowance - Recorded Investment | 305 | 51
Impaired loans with allowance - Unpaid Principal Balance | 305 | 51
Impaired loans with related allowance - Related Allowance | 144 | 7
Impaired loans with related allowance - Average Recorded Investment | 169 | 202
Real estate - construction, land development & other land loans [Member] |  |
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment | 2,838 | 3,221
Impaired loans with no related allowance - Unpaid Principal Balance | 4,023 | 4,558
Impaired loans with no related allowance - Average Recorded Investment | 2,871 | 3,641
Loans with an allowance recorded: |  |
Impaired loans with allowance - Recorded Investment | 234 | 780
Impaired loans with allowance - Unpaid Principal Balance | 243 | 798
Impaired loans with related allowance - Related Allowance | 23 | 184
Impaired loans with related allowance - Average Recorded Investment | 570 | 844
Real estate - mortgage - residential (1-4 family) first mortgages [Member] |  |
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment | 6,461 | 10,035
Impaired loans with no related allowance - Unpaid Principal Balance | 7,029 | 12,220
Impaired loans with no related allowance - Average Recorded Investment | 7,533 | 11,008
Loans with an allowance recorded: |  |
Impaired loans with allowance - Recorded Investment | 8,526 | 10,772
Impaired loans with allowance - Unpaid Principal Balance | 8,721 | 11,007
Impaired loans with related allowance - Related Allowance | 929 | 1,339
Impaired loans with related allowance - Average Recorded Investment | 10,198 | 13,314
Real estate - mortgage - home equity loans / lines of credit [Member] |  |
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment | 52 | 114
Impaired loans with no related allowance - Unpaid Principal Balance | 79 | 146
Impaired loans with no related allowance - Average Recorded Investment | 70 | 139
Loans with an allowance recorded: |  |
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 | 83 | 324
Real estate - mortgage - commercial and other [Member] |  |
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment | 2,158 | 4,598
Impaired loans with no related allowance - Unpaid Principal Balance | 2,394 | 5,112
Impaired loans with no related allowance - Average Recorded Investment | 3,162 | 8,165
Loans with an allowance recorded: |  |
Impaired loans with allowance - Recorded Investment | 7,285 | 1,896
Impaired loans with allowance - Unpaid Principal Balance | 7,392 | 1,929
Impaired loans with related allowance - Related Allowance | 487 | 105
Impaired loans with related allowance - Average Recorded Investment | 5,354 | 4,912
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 |  | 2
Impaired loans with no related allowance - Average Recorded Investment | 1 | 1
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 |  | $ 49

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