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Loans and Asset Quality Information (Summary of Major Categories of Total Loans Outstanding) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
All loans (non-covered and covered):      
Amount of loans $ 3,290,059 $ 2,710,761 $ 2,538,095
Percentage of Loans 100.00% 100.00% 100.00%
Unamortized net deferred loan costs $ (704) $ (49) $ 1,258
Total loans 3,289,355 2,710,712 2,539,353
Commercial, financial, and agricultural [Member]      
All loans (non-covered and covered):      
Amount of loans $ 363,219 $ 261,813 $ 228,124
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 $ 424,539 $ 750,679 $ 298,410
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 $ 792,791 $ 750,679 $ 757,696
Percentage of Loans 24.00% 28.00% 30.00%
Real estate - mortgage - home equity loans / lines of credit [Member]      
All loans (non-covered and covered):      
Amount of loans $ 317,336 $ 239,105 $ 235,380
Percentage of Loans 10.00% 9.00% 9.00%
Real estate mortgage commercial and other [Member]      
All loans (non-covered and covered):      
Amount of loans $ 1,335,924 $ 1,049,460 $ 955,550
Percentage of Loans 40.00% 39.00% 38.00%
Installment loans to individuals [Member]      
All loans (non-covered and covered):      
Amount of loans $ 56,250 $ 55,037 $ 47,163
Percentage of Loans 2.00% 2.00% 2.00%