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Impaired Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance $ 3,296 $ 3,630
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied (1,135) (1,094)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 2,161 2,536
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 221 227
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied (21) (21)
Impaired Financing Receivable, with Related Allowance, Recorded Investment 200 206
Impaired Financing Receivable, With Related Allowance, Related Allowance 36 42
Impaired Financing Receivable, Unpaid Principal Balance 3,517 3,857
Impaired Financing Receivable, Charge-off And Payments Applied (1,156) (1,115)
Impaired Financing Receivable, Recorded Investment 2,361 2,742
Impaired Financing Receivable, Related Allowance 36 42
Commercial and Industrial Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance   0
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied   0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment   0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 51  
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied (21)  
Impaired Financing Receivable, with Related Allowance, Recorded Investment 30  
Impaired Financing Receivable, With Related Allowance, Related Allowance 30  
Construction And Land Development Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance   0
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied   0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment   0
Commercial Real Estate Owner Occupied Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 170 175
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied 0 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 170 175
Impaired Financing Receivable, With Related Allowance, Related Allowance 6 11
Commercial Real Estate Other Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 3,296 3,630
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied (1,135) (1,094)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 2,161 2,536
Commercial Real Estate Loans, Total [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 3,296 3,630
Impaired Financing Receivable, with No Related Allowance, Charge-off And Payments Applied (1,135) (1,094)
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 2,161 2,536
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 170 175
Impaired Financing Receivable, with Related Allowance, Charge-off And Payments Applied 0 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 170 175
Impaired Financing Receivable, With Related Allowance, Related Allowance $ 6 $ 11