Employee Benefit Plans (Schedule of Net Funded Status) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	$ 50,829
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	55,971	$ 50,829
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Beginning Balance	50,995	42,022
Service Cost	225	265
Interest Cost	1,624	1,748
Change in discount rate and mortality assumptions	5,971	7,981
Actuarial loss	1,157	979
Defined Benefit Plan, Benefits Paid	(2,074)	(2,000)
Defined Benefit Plan, Benefit Obligation, Ending Balance	57,898	50,995
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	50,829	43,056
Defined Benefit Plan, Actual Return on Plan Assets	6,216	7,773
Defined Benefit Plan, Contributions by Employer	1,000	2,000
Defined Benefit Plan, Benefits Paid	(2,074)	(2,000)
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	55,971	50,829
Defined Benefit Plan, (Unfunded)/Funded Status	(1,927)	(166)
SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Beginning Balance	8,647	7,544
Service Cost	135	120
Interest Cost	236	272
Change in discount rate and mortality assumptions
Actuarial loss	862	994
Defined Benefit Plan, Benefits Paid	(266)	(283)
Defined Benefit Plan, Benefit Obligation, Ending Balance	9,614	8,647
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance
Defined Benefit Plan, Actual Return on Plan Assets
Defined Benefit Plan, Contributions by Employer	266	283
Defined Benefit Plan, Benefits Paid	(266)	(283)
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance
Defined Benefit Plan, (Unfunded)/Funded Status	$ (9,614)	$ (8,647)