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Loans and Asset Quality Information (Schedule of Nonaccrual Loans) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Company's nonaccrual loans:      
Nonaccrual loans $ 23,350 $ 27,468 $ 32,796
Commercial, financial, and agricultural [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 996 1,842  
Real estate construction, land development & other land loans [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 1,565 2,945  
Real estate mortgage residential (1-4 family) first mortgages [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 14,878 16,017  
Real estate mortgage home equity loans / lines of credit [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 2,250 2,355  
Real estate mortgage commercial and other [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 3,534 4,208  
Installment loans to individuals [Member]      
Company's nonaccrual loans:      
Nonaccrual loans $ 127 $ 101