Mortgage Servicing Rights (Summary Of Changes In Capitalized MSR) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Participating Mortgage Loans [Line Items]
Fair value, beginning balance	$ 114,311	$ 144,069
Reductions due to loan payments	(5,547)	(5,584)
Reductions due to exercise of cleanup calls	(495)
Changes in fair value due to:
Changes in valuation model inputs or assumptions	834	4,459
Other changes in fair value	(1)	12
Fair value, ending balance	109,102	142,956
First Liens [Member]
Participating Mortgage Loans [Line Items]
Fair value, beginning balance	111,314	140,724
Reductions due to loan payments	(5,374)	(5,499)
Reductions due to exercise of cleanup calls	(495)
Changes in fair value due to:
Changes in valuation model inputs or assumptions	834	4,459
Other changes in fair value	(88)	(8)
Fair value, ending balance	106,191	139,676
Second Liens [Member]
Participating Mortgage Loans [Line Items]
Fair value, beginning balance	196	231
Reductions due to loan payments	(48)	(9)
Reductions due to exercise of cleanup calls	0
Changes in fair value due to:
Changes in valuation model inputs or assumptions	0	0
Other changes in fair value	45	0
Fair value, ending balance	193	222
Home Equity [Member]
Participating Mortgage Loans [Line Items]
Fair value, beginning balance	2,801	3,114
Reductions due to loan payments	(125)	(76)
Reductions due to exercise of cleanup calls	0
Changes in fair value due to:
Changes in valuation model inputs or assumptions	0	0
Other changes in fair value	42	20
Fair value, ending balance	$ 2,718	$ 3,058