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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	$ 15,502	$ 16,246	$ 22,457	$ 23,604
Change in unrealized gains or losses relating to assets still held	15,781	18,100	23,169	26,660
Loan fees and sales
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	(49)	(35)	(534)	(1,407)
Change in unrealized gains or losses relating to assets still held	230	1,820	230	1,820
Other non-interest income
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	(82)	(385)	(92)	(20)
Change in unrealized gains or losses relating to assets still held	(82)	(386)	(94)	(191)
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	15,633	16,666	23,083	25,031
Change in unrealized gains or losses relating to assets still held	$ 15,633	$ 16,666	$ 23,033	$ 25,031