Other Assets - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
Real estate owned (REO)	$ 3,965,000	$ 4,245,000
Amount related to transfers into REO	3,000,000
REO liquidations	2,000,000
Reduction related to deconsolidation	$ 1,000,000
Percentage of REO properties located in Ohio, Florida, Georgia, Illinois, and Michigan	76.00%
Sequoia
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items]
Number of REO properties recorded on balance sheet	21	24