Leases Supplemental lease information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases [Abstract]
Operating cash flows from operating leases	$ 23
Operating cash flows from finance leases	0
Financing cash flows from finance leases	0
Right-of-use assets obtained in exchange for new operating lease liabilities	51
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 0
Weighted-average remaining lease term - operating leases	6 years 11 months 19 days
Weighted-average remaining lease term - finance leases	1 year 11 months 8 days
Weighted-average discount rate - operating leases	3.45%
Weighted-average discount rate - finance leases	3.27%