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Loans and Asset Quality Information (Schedule of Impaired Loans) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015
All Total Loans [Member] |  |
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment | $ 21,639 | $ 29,930
Impaired loans with no related allowance - Unpaid Principal Balance | 26,274 | 39,484
Impaired loans with no related allowance - Average Recorded Investment | 22,635 | 34,766
Loans with an allowance recorded: |  |
Impaired loans with allowance - Recorded Investment | 18,231 | 23,749
Impaired loans with allowance - Unpaid Principal Balance | 18,701 | 24,413
Impaired loans with related allowance - Related Allowance | 1,939 | 3,311
Impaired loans with related allowance - Average Recorded Investment | 19,078 | 23,723
All Total Loans [Member] | Commercial, financial, and agricultural [Member] |  |
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment | 1,674 | 360
Impaired loans with no related allowance - Unpaid Principal Balance | 1,796 | 422
Impaired loans with no related allowance - Average Recorded Investment | 872 | 235
Loans with an allowance recorded: |  |
Impaired loans with allowance - Recorded Investment | 58 | 676
Impaired loans with allowance - Unpaid Principal Balance | 110 | 709
Impaired loans with related allowance - Related Allowance | 9 | 348
Impaired loans with related allowance - Average Recorded Investment | 229 | 616
All Total Loans [Member] | Real estate - construction, land development & other land loans [Member] |  |
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment | 3,397 | 3,944
Impaired loans with no related allowance - Unpaid Principal Balance | 4,703 | 7,421
Impaired loans with no related allowance - Average Recorded Investment | 3,746 | 4,651
Loans with an allowance recorded: |  |
Impaired loans with allowance - Recorded Investment | 784 | 954
Impaired loans with allowance - Unpaid Principal Balance | 800 | 976
Impaired loans with related allowance - Related Allowance | 169 | 241
Impaired loans with related allowance - Average Recorded Investment | 861 | 1,980
All Total Loans [Member] | Real estate - mortgage - residential (1-4 family) first mortgages [Member] |  |
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment | 10,321 | 12,346
Impaired loans with no related allowance - Unpaid Principal Balance | 12,522 | 14,644
Impaired loans with no related allowance - Average Recorded Investment | 9,098 | 11,258
Loans with an allowance recorded: |  |
Impaired loans with allowance - Recorded Investment | 11,497 | 15,285
Impaired loans with allowance - Unpaid Principal Balance | 11,725 | 15,691
Impaired loans with related allowance - Related Allowance | 1,306 | 1,912
Impaired loans with related allowance - Average Recorded Investment | 12,021 | 15,636
All Total Loans [Member] | Real estate - mortgage - home equity loans / lines of credit [Member] |  |
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment | 143 | 121
Impaired loans with no related allowance - Unpaid Principal Balance | 202 | 175
Impaired loans with no related allowance - Average Recorded Investment | 140 | 505
Loans with an allowance recorded: |  |
Impaired loans with allowance - Recorded Investment | 173 | 667
Impaired loans with allowance - Unpaid Principal Balance | 179 | 678
Impaired loans with related allowance - Related Allowance | 11 | 344
Impaired loans with related allowance - Average Recorded Investment | 358 | 430
All Total Loans [Member] | Real estate mortgage commercial and other [Member] |  |
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment | 6,103 | 13,156
Impaired loans with no related allowance - Unpaid Principal Balance | 7,049 | 16,818
Impaired loans with no related allowance - Average Recorded Investment | 8,777 | 18,112
Loans with an allowance recorded: |  |
Impaired loans with allowance - Recorded Investment | 5,719 | 6,094
Impaired loans with allowance - Unpaid Principal Balance | 5,887 | 6,279
Impaired loans with related allowance - Related Allowance | 444 | 421
Impaired loans with related allowance - Average Recorded Investment | 5,548 | 4,950
All Total Loans [Member] | Installment loans to individuals [Member] |  |
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment | 1 | 3
Impaired loans with no related allowance - Unpaid Principal Balance | 2 | 4
Impaired loans with no related allowance - Average Recorded Investment | 2 | 5
Loans with an allowance recorded: |  |
Impaired loans with allowance - Recorded Investment |  | 73
Impaired loans with allowance - Unpaid Principal Balance |  | 80
Impaired loans with related allowance - Related Allowance |  | 45
Impaired loans with related allowance - Average Recorded Investment | $ 61 | 111
Covered [Member] |  |
Loans with no related allowance recorded: |  |
Impaired loans with no related allowance - Recorded Investment |  | 5,231
Impaired loans with no related allowance - Unpaid Principal Balance |  | 8,529
Impaired loans with no related allowance - Average Recorded Investment |  | 5,607
Loans with an allowance recorded: |  |
Impaired loans with allowance - Recorded Investment |  | 3,213
Impaired loans with allowance - Unpaid Principal Balance |  | 3,476
Impaired loans with related allowance - Related Allowance |  | 624
Impaired loans with related allowance - Average Recorded Investment |  | $ 3,742

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