Mortgage Servicing Rights (Schedule Of Changes In Mortgage Servicing Rights) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Mortgage Servicing Rights [Abstract]
Balance, beginning of period	$ 20,210		$ 15,605		$ 18,184		$ 14,454
Additions for new mortgage servicing rights capitalized	3,333		1,073		6,281		2,407
Due to changes in model inputs or assumptions, changes in fair value	(969)	[1]	(103)	[1]	(1,063)	[1]	25	[1]
Other, changes in fair value	(61)	[2]	(225)	[2]	(889)	[2]	(536)	[2]
Balance, end of period	$ 22,513		$ 16,350		$ 22,513		$ 16,350

[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.