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Loans and Asset Quality Information (Schedule of Information of Loans Modified in Troubled Debt Restructuring) (Details) - All Total Loans [Member]
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
N
Dec. 31, 2017
USD ($)
N
Information related to loans modified in a troubled debt restructuring:    
Number of contracts, TDRs 6 10
TDRs arising during period Pre-Modification $ 655 $ 4,452
TDRs arising during period Post-Modification $ 684 $ 4,414
Commercial, financial, and agricultural [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 $ 38
TDRs arising during period - Nonaccrual Post-Modification $ 25
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 1
TDRs arising during period - Nonaccrual Pre-Modification $ 61 $ 32
TDRs arising during period - Nonaccrual Post-Modification $ 61 $ 32
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 2
TDRs arising during period - Accruing Pre-Modification $ 254
TDRs arising during period - Accruing Post-Modification $ 273
Number of contracts, TDRs Nonaccrual | N 3 2
TDRs arising during period - Nonaccrual Pre-Modification $ 340 $ 262
TDRs arising during period - Nonaccrual Post-Modification $ 350 $ 262
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
Real estate - mortgage - commercial and other [Member]    
Information related to loans modified in a troubled debt restructuring:    
Number of contracts, TDRs Accruing | N 6
TDRs arising during period - Accruing Pre-Modification $ 4,120
TDRs arising during period - Accruing Post-Modification $ 4,095
Number of contracts, TDRs Nonaccrual | N
TDRs arising during period - Nonaccrual Pre-Modification
TDRs arising during period - Nonaccrual Post-Modification
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