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Loans and Asset Quality Information (Summary of Major Categories of Total Loans Outstanding) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
All loans (non-covered and covered): |  |  |
Amount of loans | $ 4,190,139 | $ 4,043,355 | $ 3,430,192
Percentage of Loans | 100.00% | 100.00% | 100.00%
Unamortized net deferred loan costs (fees) | $ 489 | $ (986) | $ (437)
Total loans | 4,190,628 | 4,042,369 | 3,429,755
Commercial, financial, and agricultural [Member] |  |  |
All loans (non-covered and covered): |  |  |
Amount of loans | $ 435,730 | $ 381,130 | $ 376,940
Percentage of Loans | 10.00% | 10.00% | 11.00%
Real estate - construction, land development & other land loans [Member] |  |  |
All loans (non-covered and covered): |  |  |
Amount of loans | $ 559,450 | $ 539,020 | $ 450,746
Percentage of Loans | 13.00% | 13.00% | 13.00%
Real estate - mortgage - residential (1-4 family) first mortgages [Member] |  |  |
All loans (non-covered and covered): |  |  |
Amount of loans | $ 1,038,436 | $ 972,772 | $ 796,222
Percentage of Loans | 25.00% | 24.00% | 23.00%
Real estate - mortgage - home equity loans / lines of credit [Member] |  |  |
All loans (non-covered and covered): |  |  |
Amount of loans | $ 362,829 | $ 379,978 | $ 315,322
Percentage of Loans | 9.00% | 9.00% | 10.00%
Real estate - mortgage - commercial and other [Member] |  |  |
All loans (non-covered and covered): |  |  |
Amount of loans | $ 1,723,598 | $ 1,696,107 | $ 1,431,934
Percentage of Loans | 41.00% | 42.00% | 41.00%
Installment loans to individuals [Member] |  |  |
All loans (non-covered and covered): |  |  |
Amount of loans | $ 70,096 | $ 74,348 | $ 59,028
Percentage of Loans | 2.00% | 2.00% | 2.00%

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