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Loans and Asset Quality Information (Schedule of Information of Loans Modified in Troubled Debt Restructuring) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
All Total Loans [Member]        
Information related to loans modified in a troubled debt restructuring:        
Number of contracts, TDRs 1 7 1
Pre-Modification Restructured Balances, TDRs $ 1,071 $ 3,797 $ 1,071
Post-Modification Restructured Balances, TDRs $ 1,071 $ 3,772 $ 1,071
All Total Loans [Member] | Commercial, financial, and agricultural [Member]        
Information related to loans modified in a troubled debt restructuring:        
Number of contracts, TDRs Accruing 1 1
Pre-Modification Restructured Balances, TDRs - Accruing $ 1,071 $ 1,071
Post-Modification Restructured Balances, TDRs - Accruing $ 1,071 $ 1,071
Number of contracts, TDRs Nonaccrual
Pre-Modification Restructured Balances, TDRs Nonaccrual
Post-Modification Restructured Balances, TDRs Nonaccrual
All Total Loans [Member] | Real estate - construction, land development & other land loans [Member]        
Information related to loans modified in a troubled debt restructuring:        
Number of contracts, TDRs Accruing
Pre-Modification Restructured Balances, TDRs - Accruing
Post-Modification Restructured Balances, TDRs - Accruing
Number of contracts, TDRs Nonaccrual 1
Pre-Modification Restructured Balances, TDRs Nonaccrual $ 32
Post-Modification Restructured Balances, TDRs Nonaccrual $ 32
All Total Loans [Member] | Real estate - mortgage - residential (1-4 family) first mortgages [Member]        
Information related to loans modified in a troubled debt restructuring:        
Number of contracts, TDRs Accruing
Pre-Modification Restructured Balances, TDRs - Accruing
Post-Modification Restructured Balances, TDRs - Accruing
Number of contracts, TDRs Nonaccrual 1
Pre-Modification Restructured Balances, TDRs Nonaccrual $ 215
Post-Modification Restructured Balances, TDRs Nonaccrual $ 215
All Total Loans [Member] | Real estate - mortgage - home equity loans / lines of credit [Member]        
Information related to loans modified in a troubled debt restructuring:        
Number of contracts, TDRs Accruing
Pre-Modification Restructured Balances, TDRs - Accruing
Post-Modification Restructured Balances, TDRs - Accruing
Number of contracts, TDRs Nonaccrual
Pre-Modification Restructured Balances, TDRs Nonaccrual
Post-Modification Restructured Balances, TDRs Nonaccrual
All Total Loans [Member] | Real estate - mortgage - commercial and other [Member]        
Information related to loans modified in a troubled debt restructuring:        
Number of contracts, TDRs Accruing 5
Pre-Modification Restructured Balances, TDRs - Accruing $ 3,550
Post-Modification Restructured Balances, TDRs - Accruing $ 3,525
Number of contracts, TDRs Nonaccrual
Pre-Modification Restructured Balances, TDRs Nonaccrual
Post-Modification Restructured Balances, TDRs Nonaccrual
All Total Loans [Member] | Installment loans to individuals [Member]        
Information related to loans modified in a troubled debt restructuring:        
Number of contracts, TDRs Accruing
Pre-Modification Restructured Balances, TDRs - Accruing
Post-Modification Restructured Balances, TDRs - Accruing
Number of contracts, TDRs Nonaccrual
Pre-Modification Restructured Balances, TDRs Nonaccrual
Post-Modification Restructured Balances, TDRs Nonaccrual
Covered [Member]        
Information related to loans modified in a troubled debt restructuring:        
Number of contracts, TDRs
Pre-Modification Restructured Balances, TDRs
Post-Modification Restructured Balances, TDRs