Residential Mortgage Servicing Rights (Schedule Of Changes In Mortgage Servicing Rights) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance, beginning of period	$ 102,699	$ 96,356	$ 92,907	$ 115,010
Additions for new MSR capitalized	8,450	14,014	30,845	37,484
Changes due to collection/realization of expected cash flows over time	(4,681)	(4,878)	(13,592)	(15,249)
Changes due to valuation inputs or assumptions	(634)	(12,244)	(4,326)	(43,997)
Balance, end of period	$ 105,834	$ 93,248	$ 105,834	$ 93,248