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Loans and Asset Quality Information (Summary of Major Categories of Non-Covered Loans Outstanding) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Non-covered and covered loans:    
Non Covered Loans   $ 2,415,412
Unamortized net deferred loan costs $ (49) 873
Loans - non-covered 2,710,712 2,416,285
Unamortized net deferred loan costs  
Covered Loans 102,641
Total   2,518,053
Commercial, financial, and agricultural [Member]    
Non-covered and covered loans:    
Non Covered Loans   201,798
Covered Loans   873
Total   202,671
Real estate - construction, land development & other land loans [Member]    
Non-covered and covered loans:    
Non Covered Loans   305,228
Covered Loans   3,741
Total   308,969
Real estate - mortgage - residential (1-4 family) first mortgages [Member]    
Non-covered and covered loans:    
Non Covered Loans   692,902
Covered Loans   75,657
Total   768,559
Real estate - mortgage - home equity loans / lines of credit [Member]    
Non-covered and covered loans:    
Non Covered Loans   221,995
Covered Loans   10,606
Total   232,601
Real estate - mortgage - commercial and other [Member]    
Non-covered and covered loans:    
Non Covered Loans   945,823
Covered Loans   11,764
Total   957,587
Installment loans to individuals [Member]    
Non-covered and covered loans:    
Non Covered Loans   47,666
Covered Loans  
Total   $ 47,666