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Loans and Asset Quality Information (Summary of Major Categories of Total Loans Outstanding) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
All loans (non-covered and covered):      
Amount of loans $ 2,597,060 $ 2,518,053 $ 2,411,960
Percentage of Loans 100.00% 100.00% 100.00%
Unamortized net deferred loan costs $ 1,074 $ 873 $ 819
Total loans 2,598,134 2,518,926 2,412,779
Commercial, financial and agricultural [Member]      
All loans (non-covered and covered):      
Amount of loans $ 244,862 $ 202,671 $ 179,909
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 $ 310,993 $ 308,969 $ 282,262
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 $ 751,446 $ 768,559 $ 777,515
Percentage of Loans 29.00% 31.00% 32.00%
Real estate mortgage home equity loans/lines of credit [Member]      
All loans (non-covered and covered):      
Amount of loans $ 238,794 $ 232,601 $ 220,534
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 $ 1,000,578 $ 957,587 $ 904,496
Percentage of Loans 39.00% 38.00% 38.00%
Installment loans to individual [Member]      
All loans (non-covered and covered):      
Amount of loans $ 50,387 $ 47,666 $ 47,244
Percentage of Loans 2.00% 2.00% 2.00%