Residential Mortgage Servicing Rights (Schedule Of Changes In Mortgage Servicing Rights) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance, beginning of period	$ 141,832	$ 112,095	$ 142,973	$ 131,817
Additions for new MSR capitalized	8,626	10,177	23,486	25,020
Due to changes in model inputs or assumptions	(4,861)	(5,386)	(13,040)	(22,473)
Other	(4,372)	(2,440)	(12,194)	(19,918)
Balance, end of period	$ 141,225	$ 114,446	$ 141,225	$ 114,446