Net Periodic Benefit Costs (Schedule Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 51	$ 55	$ 101	$ 110
Expected return on plan assets	(82)	(69)	(163)	(138)
Amortization of the net loss	26	24	51	48
Net periodic (benefit) cost	(5)	10	(11)	20
Supplemental Executive Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	39	36	78	72
Interest cost	38	50	76	100
Amortization of prior service cost	8	8	16	16
Amortization of the net loss	87	59	175	118
Net periodic (benefit) cost	$ 172	$ 153	$ 345	$ 306