Leases (Schedule of Certain Lease Terms) (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Weighted average discount rate	3.35%	3.34%
Weighted average remaining lease term	13 years	13 years 4 months 24 days
Minimum [Member]
Lease Expiration Period	10 months	7 months
Range of lease renewal options	1 year	1 year
Maximum [Member]
Lease Expiration Period	19 years	20 years
Range of lease renewal options	5 years	5 years