Leases - Quantitative Lease Data (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Finance Lease Amounts:
Right-of-use Assets	$ 5,226		$ 5,226
Lease Liabilities	5,270		5,270
Operating Lease Amounts:
Right-of-use Assets	5,859		5,859
Lease Liabilities	5,918		5,918
Finance Lease Cost:
Amortization of Right-of-use assets			44
Interest on Lease Liabilities	$ 28	$ 0	43	$ 0
Operating Lease Cost			366
Short-term Lease Cost			56
Variable Lease Cost			95
Total Lease Cost			604
Cash Paid For Amounts Included In The Measurement Of Lease Liabilities:
Operating Outgoing Cash Flows From Finance Leases			43
Operating Outgoing Cash Flows From Operating Leases			355
Financing Outgoing Cash Flows From Finance Leases			12	$ 0
Right-of-use Assets Obtained In Exchange For New Finance Lease Liabilities			5,271
Right-of-use Assets Obtained In Exchange For New Operating Lease Liabilities			$ 6,147
Weighted-average Remaining Lease Term—Finance Leases (Yrs.)	31 years 3 months 15 days		31 years 3 months 15 days
Weighted-average Remaining Lease Term—Operating Leases (Yrs.)	14 years 26 days		14 years 26 days
Weighted-average Discount Rate—Finance Leases %	3.75%		3.75%
Weighted-average Discount Rate—Operating Leases %	3.47%		3.47%