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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	$ 9,074	$ 15,502	$ 11,383	$ 22,457
Change in unrealized gains or losses relating to assets still held at period end	9,151	15,781	11,383	23,169
Loan fees and sales
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	(19)	(49)	58	(534)
Change in unrealized gains or losses relating to assets still held at period end	58	230	58	230
Other non-interest income
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	3	(82)	(16)	(92)
Change in unrealized gains or losses relating to assets still held at period end	3	(82)	(16)	(94)
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	9,090	15,633	11,341	23,083
Change in unrealized gains or losses relating to assets still held at period end	$ 9,090	$ 15,633	$ 11,341	$ 23,033