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Loans and Asset Quality Information (Schedule of Information of Loans Modified in Troubled Debt Restructuring) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
N
Dec. 31, 2016
USD ($)
N
All Total Loans [Member]    
Information related to loans modified in a troubled debt restructuring:    
Number of contracts, TDRs | N 8 3
TDRs arising during period Pre-Modification $ 3,835 $ 1,824
TDRs arising during period Post-Modification $ 3,797 $ 1,881
All Total Loans [Member] | Commercial, financial, and agricultural [Member]    
Information related to loans modified in a troubled debt restructuring:    
Number of contracts, TDRs Accruing | N 1
TDRs arising during period - Accruing Pre-Modification $ 1,071
TDRs arising during period - Accruing Post-Modification $ 1,071
Number of contracts, TDRs Nonaccrual | N 1
TDRs arising during period - Nonaccrual Pre-Modification $ 38
TDRs arising during period - Nonaccrual Post-Modification $ 25
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 | N
TDRs arising during period - Accruing Pre-Modification
TDRs arising during period - Accruing Post-Modification
Number of contracts, TDRs Nonaccrual | N 1
TDRs arising during period - Nonaccrual Pre-Modification $ 32
TDRs arising during period - Nonaccrual Post-Modification $ 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 | N 1
TDRs arising during period - Accruing Pre-Modification $ 598
TDRs arising during period - Accruing Post-Modification $ 626
Number of contracts, TDRs Nonaccrual | N 1 1
TDRs arising during period - Nonaccrual Pre-Modification $ 215 $ 155
TDRs arising during period - Nonaccrual Post-Modification $ 215 $ 184
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 | N
TDRs arising during period - Accruing Pre-Modification
TDRs arising during period - Accruing Post-Modification
Number of contracts, TDRs Nonaccrual | N
TDRs arising during period - Nonaccrual Pre-Modification
TDRs arising during period - Nonaccrual Post-Modification
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 | N 5
TDRs arising during period - Accruing Pre-Modification $ 3,550
TDRs arising during period - Accruing Post-Modification $ 3,525
Number of contracts, TDRs Nonaccrual | N
TDRs arising during period - Nonaccrual Pre-Modification
TDRs arising during period - Nonaccrual Post-Modification
All Total Loans [Member] | Installment loans to individuals [Member]    
Information related to loans modified in a troubled debt restructuring:    
Number of contracts, TDRs Accruing | N
TDRs arising during period - Accruing Pre-Modification
TDRs arising during period - Accruing Post-Modification
Number of contracts, TDRs Nonaccrual | N
TDRs arising during period - Nonaccrual Pre-Modification
TDRs arising during period - Nonaccrual Post-Modification
Covered [Member]    
Information related to loans modified in a troubled debt restructuring:    
Number of contracts, TDRs | N
TDRs arising during period Pre-Modification
TDRs arising during period Post-Modification