Residential Mortgage Servicing Rights (Schedule Of Changes In Mortgage Servicing Rights) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance, beginning of period	$ 153,151	$ 142,973
Additions for new MSR capitalized	6,530	7,041
Due to changes in model inputs or assumptions	14,933	(3,606)
Other	(9,854)	(4,064)
Balance, end of period	$ 164,760	$ 142,344