Servicing Activities and Mortgage Servicing Rights Rollforward (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	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010
Mortgage Servicing Rights Rollforward:
Servicing Asset at Amortized Cost	$ 415,962	$ 553,319	$ 415,962	$ 553,319	$ 462,420	$ 489,496	$ 568,645	$ 573,196
Originated servicing rights capitalized upon sale of loans	18,498	7,041	37,027	26,657
Amortization	(34,142)	(21,429)	(63,481)	(44,217)
Increase in valuation allowance	(30,135)	0	(45,279)	0
Other	(679)	(938)	(1,801)	(2,317)
Valuation Allowance:
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance	84,734		84,734		54,599	39,455
Increase in valuation allowance	$ 30,135		$ 45,279