Mortgage Servicing Rights (Schedule Of Changes In Mortgage Servicing Rights) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012		Mar. 31, 2013	Mar. 31, 2012
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance, beginning of period					$ 27,428		$ 18,184		$ 38,192	$ 22,513
Additions for new mortgage servicing rights capitalized	4,072		5,642		15,182		11,923
Due to changes in model inputs or assumptions, changes in fair value	3,406	[1]	(2,770)	[1]	3,739	[1]	(3,833)	[1]
Other, changes in fair value	(3,817)	[2]	(896)	[2]	(4,496)	[2]	(1,785)	[2]
Balance, end of period	$ 41,853		$ 24,489		$ 41,853		$ 24,489		$ 38,192	$ 22,513

[1] Principally reflects changes in discount rates and prepayment speed assumptions, which are primarily affected by changes in interest rates.

[2] Represents changes due to collection/realization of expected cash flows over time.