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Loans and Asset Quality Information (Schedule of Nonaccrual Loans) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Company's nonaccrual loans:    
Nonaccrual loans $ 27,468 $ 47,810
Commercial, financial, and agricultural [Member]    
Company's nonaccrual loans:    
Nonaccrual loans 1,842 2,964
Real estate - construction, land development & other land loans    
Company's nonaccrual loans:    
Nonaccrual loans 2,945 4,704
Real estate residential, farmland and mutli-family [Member]    
Company's nonaccrual loans:    
Nonaccrual loans 16,017 23,829
Real estate home equity lines of credit [Member]    
Company's nonaccrual loans:    
Nonaccrual loans 2,355 3,525
Real estate - mortgage - commercial and other [Member]    
Company's nonaccrual loans:    
Nonaccrual loans 4,208 12,571
Non-covered loans to Individual    
Company's nonaccrual loans:    
Nonaccrual loans 101 217
Covered [Member]    
Company's nonaccrual loans:    
Nonaccrual loans $ 7,816