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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%