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Loans and Asset Quality Information (Summary of Major Categories of Non-Covered Loans Outstanding) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Non-covered and covered loans:      
Non Covered Loans     $ 2,518,673
Unamortized net deferred loan costs $ (808) $ (49) 1,074
Loans - non-covered 3,375,976 2,710,712 2,598,134
Total loans     78,387
Unamortized net deferred loan costs    
Covered Loans 78,387
Total     2,597,060
Commercial, financial, and agricultural [Member]      
Non-covered and covered loans:      
Non Covered Loans     244,862
Covered Loans    
Total     244,862
Real estate - construction, land development & other land loans [Member]      
Non-covered and covered loans:      
Non Covered Loans     310,832
Covered Loans     161
Total     310,993
Real estate - mortgage - residential (1-4 family) first mortgages [Member]      
Non-covered and covered loans:      
Non Covered Loans     683,367
Covered Loans     68,079
Total     751,446
Real estate - mortgage - home equity loans / lines of credit [Member]      
Non-covered and covered loans:      
Non Covered Loans     228,906
Covered Loans     9,888
Total     238,794
Real estate - mortgage - commercial and other [Member]      
Non-covered and covered loans:      
Non Covered Loans     1,000,319
Covered Loans     259
Total     1,000,578
Installment loans to individuals [Member]      
Non-covered and covered loans:      
Non Covered Loans     50,387
Covered Loans    
Total     $ 50,387