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Employee Benefits And Deferred Compensation Plans (Schedule Of Weighted Average Asset Allocation) (Details) - Pension Plan [Member]
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]    
Weighted average plan asset allocations 100.00% 100.00%
Equity Mutual Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Weighted average plan asset allocations 30.83% 27.28%
Fixed Income Mutual Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Weighted average plan asset allocations 67.59% 71.59%
Cash/Short-Term Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Weighted average plan asset allocations 1.58% 1.13%