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Loans and Asset Quality Information (Summary of Major Categories of Total Loans Outstanding) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
All loans (non-covered and covered):      
Amount of loans $ 3,376,784 $ 2,710,761 $ 2,597,060
Percentage of Loans 100.00% 100.00% 100.00%
Unamortized net deferred loan costs $ (808) $ (49) $ 1,074
Total loans 3,375,976 2,710,712 2,598,134
Commercial, financial, and agricultural [Member]      
All loans (non-covered and covered):      
Amount of loans $ 383,834 $ 261,813 $ 244,862
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 $ 446,661 $ 354,667 $ 310,832
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 $ 783,759 $ 750,679 $ 751,446
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 $ 320,953 $ 239,105 $ 238,794
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 $ 1,384,569 $ 1,049,460 $ 1,000,319
Percentage of Loans 41.00% 39.00% 39.00%
Installment loans to individuals [Member]      
All loans (non-covered and covered):      
Amount of loans $ 57,008 $ 55,037 $ 50,387
Percentage of Loans 2.00% 2.00% 2.00%