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Troubled Debt Restructuring (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]    
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing $ 462 $ 208
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual 1,462 1,850
Impaired Financing Receivable, Trouble Debt Structuring, Total 1,924 2,058
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses 42 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 31 0
Impaired Financing Receivable, Trouble Debt Structuring, Total 31 15
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses 31 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
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual   32
Impaired Financing Receivable, Trouble Debt Structuring, Total   32
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses   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 175 193
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual 0 0
Impaired Financing Receivable, Trouble Debt Structuring, Total 175 193
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses 11 31
Commercial Real Estate Other Loans [Member]    
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]    
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing 287 0
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual 1,431 1,818
Impaired Financing Receivable, Trouble Debt Structuring, Total 1,718 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 462 193
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual 1,431 1,818
Impaired Financing Receivable, Trouble Debt Structuring, Total 1,893 2,011
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses $ 11 $ 31