Other Assets - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2011 Entity Investment Location	Dec. 31, 2010 Location Investment
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
Real estate owned (REO)	$ 9,880,000	$ 14,481,000
Amount related to transfers into REO	6,000,000
REO liquidations	10,000,000
Number of REO properties recorded on balance sheet	66	83
Derivative margin posted, net	23,913,000	16,233,000
Sequoia
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
Number of REO properties recorded on balance sheet	64	81
Redwood
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
Number of REO properties recorded on balance sheet	2	2
Percentage of REO properties located in Arizona, California, Colorado, Florida, and Georgia	52.00%
Maximum
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
Negative market valuation adjustments related to REO	$ 1,000,000