Leases Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Cash Flow, Operating Activities, Lessee [Abstract]
Operating Lease, Payments	$ 664	$ 0
Leases, Operating [Abstract]
Operating lease right-of-use assets	13,531		$ 0
Operating lease liabilities	$ 13,533		$ 0
Weighted-average remaining lease term	5 years 10 months
Weighted-average discount rate	3.20%
Operating Lease Liabilities, Payments Due [Abstract]
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	$ 2,001
Lessee, Operating Lease, Liability, Payments, Due Year Two	2,587
Lessee, Operating Lease, Liability, Payments, Due Year Three	2,345
Lessee, Operating Lease, Liability, Payments, Due Year Four	2,056
Lessee, Operating Lease, Liability, Payments, Due Year Five	1,275
Lessor, Operating Lease, Payments to be Received, Thereafter	5,356
Lessor, Operating Lease, Payments to be Received	15,620
Imputed Interest on Operating Leases	2,087
Lease, Cost [Abstract]
Operating lease cost	671
Short-term lease cost	23
Variable lease cost	224
Total lease cost	918
Income from subleases	(248)
Net lease cost	$ 670