Fair Value Measurements (Summary Of Gains And Losses On Level 3 Assets And Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	$ 13,942	$ 12,709	$ 36,399	$ 36,313
Change in unrealized gains or losses relating to assets still held	14,172	14,528	37,111	39,369
Loan fees and sales
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	(230)	(309)	(764)	(1,716)
Change in unrealized gains or losses relating to assets still held	0	1,510	0	1,510
Other non-interest income
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	122	47	30	27
Change in unrealized gains or losses relating to assets still held	122	47	28	(143)
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	14,050	12,971	37,133	38,002
Change in unrealized gains or losses relating to assets still held	$ 14,050	$ 12,971	$ 37,083	$ 38,002