Residential Loans Held-for-Investment (Detail) (Residential Real Estate Loans Held for Investment, USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Real Estate Loans	$ 3,920,703	$ 3,857,672
2003 & Earlier
Real Estate Loans	1,851,493	1,939,618
2004
Real Estate Loans	1,084,285	1,116,358
2005
Real Estate Loans	131,794	136,481
2006
Real Estate Loans	189,212	191,945
2007
Real Estate Loans	68,687	75,136
2009
Real Estate Loans	169,817	189,355
2010
Real Estate Loans	303,517	208,779
2011
Real Estate Loans	$ 121,898