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Loans and Asset Quality Information (Summary of Major Categories of Total Loans Outstanding) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
All loans (non-covered and covered):      
Amount of loans $ 3,430,192 $ 2,710,761 $ 2,651,261
Percentage of Loans 100.00% 100.00% 100.00%
Unamortized net deferred loan costs (fees) $ (437) $ (49) $ 198
Total loans 3,429,755 2,710,712 2,651,459
Commercial, financial, and agricultural [Member]      
All loans (non-covered and covered):      
Amount of loans $ 376,940 $ 261,813 $ 248,877
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 $ 450,746 $ 354,667 $ 327,863
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 $ 796,222 $ 750,679 $ 756,880
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 $ 315,322 $ 239,105 $ 239,049
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 $ 1,431,934 $ 1,049,460 $ 1,026,328
Percentage of Loans 42.00% 39.00% 39.00%
Installment loans to individuals [Member]      
All loans (non-covered and covered):      
Amount of loans $ 59,028 $ 55,037 $ 52,264
Percentage of Loans 2.00% 2.00% 2.00%