Leases, Information Related to Operating Leases (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Cash Paid for Amounts Included in the Measurement of Lease Liabilities [Abstract]
Operating Cash Flow from Operating Leases	$ 536	$ 594	$ 795
Right-of-Use Assets Obtained in Exchange for New Operating Lease Liabilities	$ 302	$ 0	$ 0
Weighted-Average Remaining Lease Term - Operating Leases	6 years 9 months 3 days	7 years 3 months 14 days	7 years 3 months 29 days
Weighted-Average Discount Rate - Operating Leases	2.60%	3.20%	2.90%