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Loans and Asset Quality Information (Summary of Major Categories of Non-Covered Loans Outstanding) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Non-covered and covered loans:      
Non Covered Loans     $ 2,438,572
Unamortized net deferred loan costs $ (704) $ (49) 1,258
Loans - non-covered $ 3,289,355 2,710,712 2,439,830
Total loans     99,523
Unamortized net deferred loan costs    
Covered Loans   99,523
Total     2,538,095
Commercial, financial, and agricultural [Member]      
Non-covered and covered loans:      
Non Covered Loans     228,124
Covered Loans     743
Total     228,867
Real estate - construction, land development & other land loans [Member]      
Non-covered and covered loans:      
Non Covered Loans     298,410
Covered Loans     3,642
Total     302,052
Real estate - mortgage - residential (1-4 family) first mortgages [Member]      
Non-covered and covered loans:      
Non Covered Loans     684,085
Covered Loans     73,611
Total     757,696
Real estate - mortgage - home equity loans / lines of credit [Member]      
Non-covered and covered loans:      
Non Covered Loans     225,245
Covered Loans     10,135
Total     235,380
Real estate mortgage commercial and other [Member]      
Non-covered and covered loans:      
Non Covered Loans     955,550
Covered Loans     11,387
Total     966,937
Installment loans to individuals [Member]      
Non-covered and covered loans:      
Non Covered Loans     47,158
Covered Loans     5
Total     $ 47,163