Leases (Supplemental Lease Information) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Leases [Abstract]
Operating lease ROU assets	$ 18,925		$ 21,074
Operating lease liabilities	$ 20,194		$ 22,051
Weighted-average remaining lease term (in years)	8 years 5 months 8 days		8 years 8 months 26 days
Weighted-average discount rate	3.04%		3.08%
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 292	$ 735