Fair Value Measurements (Summary Of Gains And Losses On Level 3 Assets And Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Change in unrealized gains or losses relating to assets still held at period end	$ 7,100	$ 2,251
Investment Securities Gains (Losses), Net
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	7,100	2,251
Change in unrealized gains or losses relating to assets still held at period end	$ 7,100	$ 2,251