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Troubled Debt Restructuring (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]    
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing $ 180 $ 208
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual 1,726 1,850
Impaired Financing Receivable, Trouble Debt Structuring, Total 1,906 2,058
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses 49 31
Commercial and Industrial Loans [Member]    
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]    
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing 0 15
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual 33 0
Impaired Financing Receivable, Trouble Debt Structuring, Total 33 15
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses 33 0
Construction And Land Development Loans [Member]    
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]    
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing 0 0
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual 0 32
Impaired Financing Receivable, Trouble Debt Structuring, Total 0 32
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses 0 0
Commercial Real Estate Owner Occupied Loans [Member]    
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]    
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing 180 193
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual 0 0
Impaired Financing Receivable, Trouble Debt Structuring, Total 180 193
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses 16 31
Commercial Real Estate Other Loans [Member]    
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]    
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing 0 0
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual 1,693 1,818
Impaired Financing Receivable, Trouble Debt Structuring, Total 1,693 1,818
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses 0 0
Commercial Real Estate Loans, Total [Member]    
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]    
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing 180 193
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual 1,693 1,818
Impaired Financing Receivable, Trouble Debt Structuring, Total 1,873 2,011
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses $ 16 $ 31