Fair Value Measurements (Summary Of Gains And Losses On Level 3 Assets And Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 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	$ 5,677	$ 9,090	$ 11,002	$ 11,341
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	5,677	9,090	12,777	11,341
Change in unrealized gains or losses relating to assets still held at period end	$ 5,677	$ 9,090	$ 11,002	$ 11,341