Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (2,583)	$ (5,353)
Net Change	1,922	1,370
Ending Balance	(661)	(3,983)
Net Unrealized (Loss) Gain On Investment Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	522	(2,348)
Net Change	1,835	1,303
Ending Balance	2,357	(1,045)
Net Defined Benefit Pension Plan Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(3,105)	(3,005)
Net Change	87	67
Ending Balance	$ (3,018)	$ (2,938)