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Loans and Asset Quality Information (Summary of Major Categories of Total Loans Outstanding) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015
--- | --- | --- | ---
All loans (non-covered and covered): |  |  |
Amount of loans | $ 2,651,261 | $ 2,518,053 | $ 2,480,938
Percentage of Loans | 100.00% | 100.00% | 100.00%
Unamortized net deferred loan costs | $ 198 | $ 873 | $ 765
Total loans | 2,651,459 | 2,518,926 | 2,481,703
Commercial, financial, and agricultural [Member] |  |  |
All loans (non-covered and covered): |  |  |
Amount of loans | $ 248,877 | $ 202,671 | $ 198,624
Percentage of Loans | 9.00% | 8.00% | 8.00%
Real estate - construction, land development & other land loans [Member] |  |  |
All loans (non-covered and covered): |  |  |
Amount of loans | $ 327,863 | $ 308,969 | $ 294,426
Percentage of Loans | 12.00% | 12.00% | 12.00%
Real estate - mortgage - residential (1-4 family) first mortgages [Member] |  |  |
All loans (non-covered and covered): |  |  |
Amount of loans | $ 756,880 | $ 768,559 | $ 770,691
Percentage of Loans | 29.00% | 31.00% | 31.00%
Real estate - mortgage - home equity loans / lines of credit [Member] |  |  |
All loans (non-covered and covered): |  |  |
Amount of loans | $ 239,049 | $ 232,601 | $ 224,639
Percentage of Loans | 9.00% | 9.00% | 9.00%
Real estate mortgage commercial and other [Member] |  |  |
All loans (non-covered and covered): |  |  |
Amount of loans | $ 1,026,328 | $ 957,587 | $ 944,432
Percentage of Loans | 39.00% | 38.00% | 38.00%
Installment loans to individuals [Member] |  |  |
All loans (non-covered and covered): |  |  |
Amount of loans | $ 52,264 | $ 47,666 | $ 47,120
Percentage of Loans | 2.00% | 2.00% | 2.00%

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