Net Gain on Mortgage Loans Held for Sale (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
Cash (loss) gain:
Sales proceeds	$ (93,725)	$ 26,676	$ (148,866)	$ 49,695
Hedging activities	88,789	(19,574)	128,670	(40,276)
Cash gain, net of effects of cash hedging, on sale of mortgage loans held for sale	(4,936)	7,102	(20,196)	9,419
Non-cash gain:
Receipt of MSRs in loan sale transactions	60,137	25,620	154,352	51,006
MSR recapture payable to affiliate	(86)		(586)
Provision for losses relating to representations and warranties provided in on loans sales	(1,069)	(918)	(3,766)	(1,856)
Change in fair value relating to loans and hedging derivatives held at period end:
IRLCs	37,768	20,723	(2,382)	25,528
Mortgage loans	27,510	6,693	7,876	8,636
Hedging derivatives	(93,375)	(19,460)	(26,738)	(24,246)
Net gains on mortgage loans held for sale at fair value	$ 25,949	$ 39,760	$ 108,560	$ 68,487