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Loans and Asset Quality Information (Schedule of Nonaccrual Loans) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Company's nonaccrual loans:      
Nonaccrual loans $ 20,684 $ 22,575 $ 21,849
Commercial, financial, and agricultural [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 980 919  
Real estate construction, land development & other land loans [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 1,677 2,265  
Real estate mortgage residential (1-4 family) first mortgages [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 9,958 10,115  
Real estate mortgage home equity loans / lines of credit [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 1,632 1,685  
Real estate mortgage commercial and other [Member]      
Company's nonaccrual loans:      
Nonaccrual loans 6,280 7,452  
Installment loans to individuals [Member]      
Company's nonaccrual loans:      
Nonaccrual loans $ 157 $ 139