Fair Value (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Gains (losses) from changes in estimated fair values included in earnings for financial statement items carried at estimated fair value
Total gains (losses) from changes in estimated fair values included in earnings	$ (7,635)	$ 53,840	$ 10,647	$ 102,975
Excess servicing spread financing at fair value	(29)		(29)
Change in fair value of mortgage loans held for sale at fair value
Gains (losses) from changes in estimated fair values included in earnings for financial statement items carried at estimated fair value
Total gains (losses) from changes in estimated fair values included in earnings	(6,060)	56,079	12,428	108,205
Net servicing income
Gains (losses) from changes in estimated fair values included in earnings for financial statement items carried at estimated fair value
Total gains (losses) from changes in estimated fair values included in earnings	(1,575)	(2,239)	(1,781)	(5,230)
Excess servicing spread financing at fair value	(29)		(29)
Mortgage loans held for sale at fair value
Gains (losses) from changes in estimated fair values included in earnings for financial statement items carried at estimated fair value
Total gains (losses) from changes in estimated fair values included in earnings	(6,060)	56,079	12,428	108,205
Mortgage loans held for sale at fair value | Change in fair value of mortgage loans held for sale at fair value
Gains (losses) from changes in estimated fair values included in earnings for financial statement items carried at estimated fair value
Total gains (losses) from changes in estimated fair values included in earnings	(6,060)	56,079	12,428	108,205
Mortgage servicing rights at fair value
Gains (losses) from changes in estimated fair values included in earnings for financial statement items carried at estimated fair value
Total gains (losses) from changes in estimated fair values included in earnings	(1,575)	(2,239)	(1,781)	(5,230)
Mortgage servicing rights at fair value | Net servicing income
Gains (losses) from changes in estimated fair values included in earnings for financial statement items carried at estimated fair value
Total gains (losses) from changes in estimated fair values included in earnings	$ (1,575)	$ (2,239)	$ (1,781)	$ (5,230)