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Loans and Asset Quality Information (Summary of Major Categories of Total Loans Outstanding) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | --- | ---
All loans (non-covered and covered): |  |  |
Amount of loans | $ 3,430,192 | $ 2,710,761 | $ 2,651,261
Percentage of Loans | 100.00% | 100.00% | 100.00%
Unamortized net deferred loan costs (fees) | $ (437) | $ (49) | $ 198
Total loans | 3,429,755 | 2,710,712 | 2,651,459
Commercial, financial, and agricultural [Member] |  |  |
All loans (non-covered and covered): |  |  |
Amount of loans | $ 376,940 | $ 261,813 | $ 248,877
Percentage of Loans | 11.00% | 9.00% | 9.00%
Real estate - construction, land development & other land loans [Member] |  |  |
All loans (non-covered and covered): |  |  |
Amount of loans | $ 450,746 | $ 354,667 | $ 327,863
Percentage of Loans | 13.00% | 13.00% | 12.00%
Real estate - mortgage - residential (1-4 family) first mortgages [Member] |  |  |
All loans (non-covered and covered): |  |  |
Amount of loans | $ 796,222 | $ 750,679 | $ 756,880
Percentage of Loans | 23.00% | 28.00% | 29.00%
Real estate - mortgage - home equity loans / lines of credit [Member] |  |  |
All loans (non-covered and covered): |  |  |
Amount of loans | $ 315,322 | $ 239,105 | $ 239,049
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 | $ 1,431,934 | $ 1,049,460 | $ 1,026,328
Percentage of Loans | 42.00% | 39.00% | 39.00%
Installment loans to individuals [Member] |  |  |
All loans (non-covered and covered): |  |  |
Amount of loans | $ 59,028 | $ 55,037 | $ 52,264
Percentage of Loans | 2.00% | 2.00% | 2.00%

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