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Loans and Asset Quality Information (Schedule of Nonaccrual Loans) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Company's nonaccrual loans:      
Nonaccrual loans $ 25,684 $ 27,468 $ 41,411
Commercial, financial, and agricultural [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 1,368 1,842  
Real estate construction, land development & other land loans [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 1,607 2,945  
Real estate mortgage residential (1-4 family) first mortgages [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 15,833 16,017  
Real estate mortgage home equity loans / lines of credit [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 2,238 2,355  
Real estate mortgage commercial and other [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 4,577 4,208  
Installment loans to individuals [Member]      
Company's nonaccrual loans:      
Nonaccrual loans $ 61 $ 101