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Loans and Asset Quality Information (Summary of Major Categories of Total Loans Outstanding) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
All loans (non-covered and covered):      
Amount of loans $ 2,411,960 $ 2,395,228 $ 2,433,734
Percentage of Loans 100.00% 100.00% 100.00%
Unamortized net deferred loan costs $ 819 $ 946 $ 651
Loans, total 2,412,779 2,396,174 2,434,385
Commercial, financial and agricultural [Member]      
All loans (non-covered and covered):      
Amount of loans $ 179,909 $ 160,878 $ 165,021
Percentage of Loans 7.00% 7.00% 7.00%
Real Estate construction, land development and other land loans [Member]      
All loans (non-covered and covered):      
Amount of loans $ 282,262 $ 288,148 $ 295,868
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 $ 777,515 $ 789,871 $ 814,712
Percentage of Loans 32.00% 33.00% 33.00%
Real estate mortgage home equity loans/lines of credit [Member]      
All loans (non-covered and covered):      
Amount of loans $ 220,534 $ 223,500 $ 227,381
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 $ 904,496 $ 882,127 $ 868,599
Percentage of Loans 38.00% 37.00% 36.00%
Installment loans to individual [Member]      
All loans (non-covered and covered):      
Amount of loans $ 47,244 $ 50,704 $ 62,153
Percentage of Loans 2.00% 2.00% 3.00%