Leases - Operating Lease Liabilities Payments Due (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	$ 2,025
Lessee, Operating Lease, Liability, Payments, Due Year Two	2,168
Lessee, Operating Lease, Liability, Payments, Due Year Three	1,892
Lessee, Operating Lease, Liability, Payments, Due Year Four	1,797
Lessee, Operating Lease, Liability, Payments, Due Year Five	1,709
Lessee, Operating Lease, Liability, Payments, Due after Year Five	3,098
Lessee, Operating Lease, Liability, Payments, Due	12,689
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(1,301)
Other Liabilities [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Liability	$ 11,388	$ 11,800