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Impaired Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance $ 3,590 $ 3,029
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied (1,090) (1,092)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 2,500 1,937
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 233 193
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied (20) 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 213 193
Impaired Financing Receivable, With Related Allowance, Related Allowance 49 31
Impaired Financing Receivable, Unpaid Principal Balance 3,823 3,222
Impaired Financing Receivable, Charge-off And Payments Applied (1,110) (1,092)
Impaired Financing Receivable, Recorded Investment 2,713 2,130
Impaired Financing Receivable, Related Allowance 49 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 53  
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied (20)  
Impaired Financing Receivable, with Related Allowance, Recorded Investment 33  
Impaired Financing Receivable, With Related Allowance, Related Allowance 33  
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
Commercial Real Estate Owner Occupied Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 180 193
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied 0 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 180 193
Impaired Financing Receivable, With Related Allowance, Related Allowance 16 31
Commercial Real Estate Other Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 3,590 2,874
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied (1,090) (984)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 2,500 1,890
Commercial Real Estate Loans, Total [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 3,590 2,874
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied (1,090) (984)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 2,500 1,890
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 180 193
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied 0 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 180 193
Impaired Financing Receivable, With Related Allowance, Related Allowance $ 16 $ 31