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Loans and Asset Quality Information (Summary of Major Categories of Total Loans Outstanding) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
All loans:    
Amount of loans $ 4,247,765 $ 4,043,355
Percentage of Loans 100.00% 100.00%
Unamortized net deferred loan costs (fees) $ 1,299 $ (986)
Total loans 4,249,064 4,042,369
Commercial, financial, and agricultural [Member]    
All loans:    
Amount of loans $ 457,037 $ 381,130
Percentage of Loans 11.00% 10.00%
Real estate - construction, land development & other land loans [Member]    
All loans:    
Amount of loans $ 518,976 $ 539,020
Percentage of Loans 12.00% 13.00%
Real estate - mortgage - residential (1-4 family) first mortgages [Member]    
All loans:    
Amount of loans $ 1,054,176 $ 972,772
Percentage of Loans 25.00% 24.00%
Real estate - mortgage - home equity loans / lines of credit [Member]    
All loans:    
Amount of loans $ 359,162 $ 379,978
Percentage of Loans 8.00% 9.00%
Real estate - mortgage - commercial and other [Member]    
All loans:    
Amount of loans $ 1,787,022 $ 1,696,107
Percentage of Loans 42.00% 42.00%
Installment loans to individuals [Member]    
All loans:    
Amount of loans $ 71,392 $ 74,348
Percentage of Loans 2.00% 2.00%