Employee Benefit Plans (Reconciliation Of The Plan's Benefit Obligations, Fair Value Of Assets And The Funded Status) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Change in projected benefit obligation:
Projected benefit obligation at beginning of period	$ 84,328	$ 69,574
Service cost	3,693	3,207	$ 3,346
Interest cost	2,537	2,777	2,387
Actuarial (gain) loss	11,154	11,993
Benefits paid and plan expenses	(4,152)	(3,223)
Projected benefit obligation at end of period	97,560	84,328	69,574
Change in plan assets:
Fair value of plan assets at beginning of period	87,827	75,188
Actual return on plan assets	18,501	15,862
Benefits paid and plan expenses	(4,152)	(3,223)
Fair value of plan assets at end of period	102,176	87,827	$ 75,188
Funded status at end of period	$ 4,616	$ 3,499