Allowance for Loan Losses (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individual loan balance is classified as nonaccrual status or troubled debt restructure	$ 100,000
Debt Instrument Non Performing Assets	$ 1,200,000
Percentage for Total Loans	0.14%
Allowance for Loan and Lease Losses, Adjustments, Other	$ (400,000)	$ 50,000
Allowance for Loan and Lease Losses Write-offs, Net	$ 164,000	$ 332,000
Allowance For Loan And Lease Losses Write Off Percentage	0.08%	0.15%
Percentage Of Allowance For Non Performing Loans	694.00%		629.00%
Percentage Of Allowance For Total Loans	0.94%		1.00%
Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Threshold for individually evaluating loans	$ 1,000,000
Allowance for Loan and Lease Losses, Adjustments, Other	(448,000)	$ (160,000)
Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum individual loan balance requiring quarterly review	2,000,000
Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Threshold for individually evaluating loans	250,000
Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum individual loan balance requiring quarterly review	$ 100,000
Minimum [Member] | Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum percent of portfolio to be reviewed	50.00%
Maximum [Member] | Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum percent of portfolio to be reviewed	55.00%