Employee Benefits And Deferred Compensation Plans (Schedule Of Target Plan Asset Allocations) (Details)	Dec. 31, 2014	Dec. 31, 2013
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	77.80%	75.98%
Fixed Income Security Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average plan asset allocations	19.30%	20.87%
Cash/Short Term Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average plan asset allocations	2.90%	3.15%