Leases Leases (Supplemental Cash Flow and Balance Sheet Information) (Details) - USD ($)			12 Months Ended
		Jan. 01, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases			$ 1,394,000
Operating cash flows from finance leases			68,000
Financing cash flows from finance leases			106,000	$ 0	$ 0
Right-of-use assets obtained in exchange for new lease obligations:
Operating leases	[1]		14,030,000
Finance leases	[1]		$ 1,612,000
Weighted average remaining lease term (years)
Operating leases			15 years 2 months
Finance leases			22 years 5 months 12 days
Weighted average discount rate:
Operating Leases			3.39%
Finance leases			4.00%
ASU 2016-02
Right-of-use assets obtained in exchange for new lease obligations:
Operating leases		$ 10,500,000
Finance leases		$ 1,600,000

[1] (1) Reflects right-of-use assets recorded for the period indicated, including $10.5 million of operating leases and $1.6 million of finance leases recorded upon adoption of ASU 2016-02, as of January 1, 2019.