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Loans and Asset Quality Information (Schedule of Nonaccrual Loans) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]    
Nonaccrual loans $ 24,866 $ 22,575
Commercial, financial, and agricultural    
Loans and Leases Receivable Disclosure [Line Items]    
Nonaccrual loans 5,518 919
Real estate, commercial | Real estate – construction, land development & other land loans    
Loans and Leases Receivable Disclosure [Line Items]    
Nonaccrual loans 1,067 2,265
Real estate, commercial | Real estate – mortgage – commercial and other    
Loans and Leases Receivable Disclosure [Line Items]    
Nonaccrual loans 8,820 7,452
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages    
Loans and Leases Receivable Disclosure [Line Items]    
Nonaccrual loans 7,552 10,115
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit    
Loans and Leases Receivable Disclosure [Line Items]    
Nonaccrual loans 1,797 1,685
Installment loans to individuals    
Loans and Leases Receivable Disclosure [Line Items]    
Nonaccrual loans $ 112 $ 139