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Impaired Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance $ 3,630 $ 3,029
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied (1,094) (1,092)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 2,536 1,937
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 227 193
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied (21) 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 206 193
Impaired Financing Receivable, With Related Allowance, Related Allowance 42 31
Impaired Financing Receivable, Unpaid Principal Balance 3,857 3,222
Impaired Financing Receivable, Charge-off And Payments Applied (1,115) (1,092)
Impaired Financing Receivable, Recorded Investment 2,742 2,130
Impaired Financing Receivable, Related Allowance 42 31
Commercial and Industrial Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance   15
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied   0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment   15
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 52  
Impaired Financing Receivable, with Related Allowance, Recorded Investment 31  
Impaired Financing Receivable, With Related Allowance, Related Allowance 31  
Construction And Land Development Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance   140
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied   (108)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment   32
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied (21)  
Commercial Real Estate Owner Occupied Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 175 193
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied 0 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 175 193
Impaired Financing Receivable, With Related Allowance, Related Allowance 11 31
Commercial Real Estate Other Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 3,630 2,874
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied (1,094) (984)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 2,536 1,890
Commercial Real Estate Loans, Total [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 3,630 2,874
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied (1,094) (984)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 2,536 1,890
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 175 193
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied 0 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 175 193
Impaired Financing Receivable, With Related Allowance, Related Allowance $ 11 $ 31