Leases Leases (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Cash Flow, Operating Activities, Lessee [Abstract]
Operating Lease, Payments		$ 2,019	$ 0
Leases, Operating [Abstract]
Operating lease right-of-use assets	$ 12,544	12,544		$ 0
Operating lease liabilities	$ 12,557	$ 12,557		$ 0
Weighted-average remaining lease term	5 years 3 months	5 years 3 months
Weighted-average discount rate	3.21%	3.21%
Operating Lease Liabilities, Payments Due [Abstract]
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	$ 690	$ 690
Lessee, Operating Lease, Liability, Payments, Due Year Two	2,623	2,623
Lessee, Operating Lease, Liability, Payments, Due Year Three	2,388	2,388
Lessee, Operating Lease, Liability, Payments, Due Year Four	2,085	2,085
Lessee, Operating Lease, Liability, Payments, Due Year Five	1,306	1,306
Lessor, Operating Lease, Payments to be Received, Thereafter	5,362	5,362
Lessor, Operating Lease, Payments to be Received	14,454	14,454
Imputed Interest on Operating Leases	1,897	1,897
Lease, Cost [Abstract]
Operating lease cost	466	1,802
Short-term lease cost	221	266
Variable lease cost	103	741
Total lease cost	790	2,809
Income from subleases	(189)	(650)
Net lease cost	$ 601	$ 2,159