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Loans and Asset Quality Information (Summary of Major Categories of Total Loans Outstanding) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015
--- | --- | --- | ---
All loans (non-covered and covered): |  |  |
Amount of loans | $ 2,538,095 | $ 2,518,053 | $ 2,394,616
Percentage of Loans | 100.00% | 100.00% | 100.00%
Unamortized net deferred loan costs | $ 1,258 | $ 873 | $ 783
Loans, total | 2,539,353 | 2,518,926 | 2,395,399
Commercial, financial and agricultural [Member] |  |  |
All loans (non-covered and covered): |  |  |
Amount of loans | $ 228,867 | $ 202,671 | $ 176,013
Percentage of Loans | 9.00% | 8.00% | 7.00%
Real Estate construction, land development and other land loans [Member] |  |  |
All loans (non-covered and covered): |  |  |
Amount of loans | $ 302,052 | $ 308,969 | $ 285,319
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 | $ 757,696 | $ 768,559 | $ 776,313
Percentage of Loans | 30.00% | 31.00% | 33.00%
Real estate mortgage home equity loans/lines of credit [Member] |  |  |
All loans (non-covered and covered): |  |  |
Amount of loans | $ 235,380 | $ 232,601 | $ 223,679
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 | $ 966,937 | $ 957,587 | $ 885,282
Percentage of Loans | 38.00% | 38.00% | 37.00%
Installment loans to individual [Member] |  |  |
All loans (non-covered and covered): |  |  |
Amount of loans | $ 47,163 | $ 47,666 | $ 48,010
Percentage of Loans | 2.00% | 2.00% | 2.00%

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