Employee Benefits And Deferred Compensation Plans (Schedule Of Major Categories Of Assets) (Details) - Pension Benefits [Member] - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 4,980	$ 4,998	$ 6,536
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	4,980	4,998
Mutual Funds, Money Market [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	128	50
Fixed Income Mutual Funds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	3,225	3,314
Equities, Small Cap [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	283	255
Equity, Mid Cap [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	149	151
Equities, Large Cap [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	713	794
Equities, International Large Cap [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 482	$ 434