Accumulated Other Comprehensive Income (Loss) (Summary Of Changes In Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 5,119
Other comprehensive (loss) income	(3,098)	$ 3,090
Ending balance	2,021
Unrealized gains and losses on available-for-sale securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	5,119	1,187
Other comprehensive income (loss) before reclassification	(3,081)	3,120
Other comprehensive (loss) income	(3,098)	3,090
Ending balance	2,021	4,277
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive (loss) income	(3,098)	3,090
Amount Reclassified From Accumulated Other Comprehensive Income (Loss) [Member] | Unrealized gains and losses on available-for-sale securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount reclassified from accumulated other comprehensive (income) loss	$ (17)	$ (30)