Residential Mortgage Servicing Rights (Schedule Of Changes In Mortgage Servicing Rights) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance, beginning of period	$ 115,010	$ 169,025	$ 153,151
Additions for new MSR capitalized	51,000	25,169	29,069
Sale of MSR assets	0	(34,401)	0
Changes due to collection/realization of expected cash flows over time	(19,680)	(25,408)	(24,533)
Changes due to valuation inputs or assumptions	(53,423)	(19,375)	11,338
Balance, end of period	$ 92,907	$ 115,010	$ 169,025