Fair Value (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value assets liabilities transfers amount between level 1 and level 2	$ 0	$ 0	$ 0	$ 0
Impaired loans, unpaid principal balance with allowance recorded	1,803		1,803		$ 1,897
Impaired loans, allowance	271		271		276
Provision for loan losses	750	750	1,300	1,525
Troubled debt restructurings	5,100		$ 5,100		5,500
Maximum maturity period of short term borrowings			90 days
Measured Using Present Value of Cash Flows
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Troubled debt restructurings	606		$ 606		694
Collateral Dependent Impaired Loans
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impaired loans, unpaid principal balance with allowance recorded	1,100		1,100		1,100
Impaired loans, allowance	229		229		$ 227
Provision for loan losses	$ 46	$ 60	$ 46	$ 126