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Loans and Asset Quality Information (Summary of Major Categories of Total Loans Outstanding) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016
--- | --- | --- | ---
All loans (non-covered and covered): |  |  |
Amount of loans | $ 3,376,784 | $ 2,710,761 | $ 2,597,060
Percentage of Loans | 100.00% | 100.00% | 100.00%
Unamortized net deferred loan costs | $ (808) | $ (49) | $ 1,074
Total loans | 3,375,976 | 2,710,712 | 2,598,134
Commercial, financial, and agricultural [Member] |  |  |
All loans (non-covered and covered): |  |  |
Amount of loans | $ 383,834 | $ 261,813 | $ 244,862
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 | $ 446,661 | $ 354,667 | $ 310,832
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 | $ 783,759 | $ 750,679 | $ 751,446
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 | $ 320,953 | $ 239,105 | $ 238,794
Percentage of Loans | 10.00% | 9.00% | 9.00%
Real estate - mortgage - commercial and other [Member] |  |  |
All loans (non-covered and covered): |  |  |
Amount of loans | $ 1,384,569 | $ 1,049,460 | $ 1,000,319
Percentage of Loans | 41.00% | 39.00% | 39.00%
Installment loans to individuals [Member] |  |  |
All loans (non-covered and covered): |  |  |
Amount of loans | $ 57,008 | $ 55,037 | $ 50,387
Percentage of Loans | 2.00% | 2.00% | 2.00%

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