Leases Leases (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Cash Flow, Operating Activities, Lessee [Abstract]
Operating Lease, Payments		$ 1,340	$ 0
Leases, Operating [Abstract]
Operating lease right-of-use assets	$ 12,805	12,805		$ 0
Operating lease liabilities	$ 12,815	$ 12,815		$ 0
Weighted-average remaining lease term	5 years 6 months	5 years 6 months
Weighted-average discount rate	3.21%	3.21%
Operating Lease Liabilities, Payments Due [Abstract]
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	$ 1,326	$ 1,326
Lessee, Operating Lease, Liability, Payments, Due Year Two	2,573	2,573
Lessee, Operating Lease, Liability, Payments, Due Year Three	2,346	2,346
Lessee, Operating Lease, Liability, Payments, Due Year Four	2,057	2,057
Lessee, Operating Lease, Liability, Payments, Due Year Five	1,276	1,276
Lessor, Operating Lease, Payments to be Received, Thereafter	5,177	5,177
Lessor, Operating Lease, Payments to be Received	14,755	14,755
Imputed Interest on Operating Leases	1,940	1,940
Lease, Cost [Abstract]
Operating lease cost	647	1,318
Short-term lease cost	22	45
Variable lease cost	432	656
Total lease cost	1,101	2,019
Income from subleases	(213)	(461)
Net lease cost	$ 888	$ 1,558