Right-of-Use Assets and Operating Lease Liabilities (Lease Information) (Details) $ in Thousands	Jun. 30, 2019 USD ($) lease
Lessee, Lease, Description [Line Items]
Number of ground leases | lease	3
Ground Leases
Lessee, Lease, Description [Line Items]
Operating lease – ROU assets	$ 4,612
Operating lease – lease liabilities	$ (6,318)
Weighted average remaining lease term	14 years 8 months 12 days
Weighted average discount rate	4.10%
Operating lease - accrued lease payments	$ 1,706
Headquarters Office Lease
Lessee, Lease, Description [Line Items]
Operating lease – ROU assets	3,243
Operating lease – lease liabilities	$ (3,919)
Weighted average remaining lease term	5 years 9 months 18 days
Weighted average discount rate	3.50%
Operating lease - accrued lease payments	$ 677