Debt (Schedule Of Securities Sold Under Agreements To Repurchase) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt [Abstract]
Balance at year-end	$ 82	$ 93	$ 217
Average during the year	90	173	240
Maximum month-end balance	$ 93	$ 223	$ 274
Weighted average rate during the year (in hundredths)	0.00%	0.00%	0.00%
Rate at December 31 (in hundredths)	0.15%	0.15%	0.23%