Fair Value Measurements (Summary Of Gains And Losses On Level 3 Assets And Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	$ 6,955	$ 7,358
Change in unrealized gains or losses relating to assets still held	7,717	10,415
Loan fees and sales
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	(485)	(1,372)
Change in unrealized gains or losses relating to assets still held	279	1,855
Other non-interest income
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	(10)	365
Change in unrealized gains or losses relating to assets still held	(12)	195
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	7,450	8,365
Change in unrealized gains or losses relating to assets still held	$ 7,450	$ 8,365