Troubled Debt Restructuring (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing	$ 167	$ 462
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual	710	1,462
Impaired Financing Receivable, Trouble Debt Structuring, Total	877	1,924
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses	3	42
Commercial and Industrial 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	31
Impaired Financing Receivable, Trouble Debt Structuring, Total	0	31
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses	0	31
Commercial Real Estate Owner Occupied Loans [Member]
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing	167	175
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual	0	0
Impaired Financing Receivable, Trouble Debt Structuring, Total	167	175
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses	3	11
Commercial Real Estate Other Loans [Member]
Impaired Financing Receivable And Troubled Debt Restructing [Line Items]
Impaired Financing Receivable, Troubled Debt Restructuring, Still Accruing	0	287
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual	710	1,431
Impaired Financing Receivable, Trouble Debt Structuring, Total	710	1,718
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	167	462
Impaired Financing Receivable, Troubled Debt Restructuring, Nonaccrual	710	1,431
Impaired Financing Receivable, Trouble Debt Structuring, Total	877	1,893
Impaired Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses	$ 3	$ 11