DEBT (Details) (USD $)					3 Months Ended				3 Months Ended		3 Months Ended				3 Months Ended			3 Months Ended		3 Months Ended				3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Wells Fargo Facility	Dec. 31, 2012 Wells Fargo Facility	Mar. 31, 2013 Wells Fargo Facility Secured revolving funding facility item	Dec. 31, 2012 Wells Fargo Facility Secured revolving funding facility	May 22, 2012 Wells Fargo Facility Secured revolving funding facility	Dec. 14, 2011 Wells Fargo Facility Secured revolving funding facility	Mar. 31, 2013 Wells Fargo Facility Secured revolving funding facility Minimum	Jun. 29, 2012 Wells Fargo Facility Secured revolving funding facility Minimum	Mar. 31, 2013 Wells Fargo Facility Secured revolving funding facility Maximum	Mar. 31, 2013 Citibank Facility	Dec. 31, 2012 Citibank Facility	Dec. 08, 2011 Citibank Facility Prior revolving credit facility	Mar. 31, 2013 Citibank Facility Secured revolving funding facility	Mar. 31, 2012 Citibank Facility Secured revolving funding facility	May 01, 2012 Citibank Facility Secured revolving funding facility	Mar. 31, 2013 Citibank Facility Secured revolving funding facility Minimum	Mar. 31, 2013 Citibank Facility Secured revolving funding facility Maximum	Mar. 31, 2013 Capital One Facility	Dec. 31, 2012 Capital One Facility	Mar. 31, 2013 Capital One Facility Minimum	Dec. 31, 2012 Capital One Facility Minimum	Mar. 31, 2013 Capital One Facility Secured funding facility	Dec. 31, 2012 Capital One Facility Secured funding facility	May 18, 2012 Capital One Facility Secured funding facility	Mar. 31, 2013 Capital One Facility Secured funding facility Minimum	Mar. 31, 2013 Capital One Facility Secured funding facility Maximum
Secured funding agreements
Total Commitment	$ 308,725,000	$ 308,725,000	$ 172,500,000	$ 172,500,000			$ 172,500,000	$ 75,000,000				$ 86,225,000	$ 86,225,000	$ 50,000,000			$ 86,200,000			$ 50,000,000	$ 50,000,000					$ 50,000,000
Variable interest basis					30 day LIBOR										LIBOR									LIBOR
Interest rate margin (as a percent)									2.50%		2.75%							2.50%	3.50%								2.50%	4.00%
Variable interest rate floor (as a percent)															0.50%
Non-utilization fee on average available balance (as a percent)					0.25%										0.25%
Non-utilization fee					44,000										61,000	10,000
Number of extension periods available for maturity date					2
Extension period of maturity date					12 months										12 months									12 months
Outstanding Balance	200,050,000	144,256,000	126,675,000	98,196,000	126,700,000	98,200,000						41,215,000	13,900,000							32,160,000	32,160,000			32,200,000	32,200,000
Ratio of debt to tangible net worth																				3.0
Ratio of total debt to total assets (as a percent)											75.00%
Liquidity to be maintained as a percentage of tangible net worth									5.00%									5.00%		5.00%
Amount of liquidity to be maintained									20,000,000									20,000,000		20,000,000
Fixed charge coverage ratio									1.5											1.5
Specified amount for computing the tangible net worth to be maintained									135,500,000
Percentage of net proceeds raised in all future equity issuances used for computing the tangible net worth to be maintained									80.00%									80.00%		80.00%
Value of loans held for investment, which are used to establish compliance with the required minimum fixed charge ratio with respect to the entity as guarantor										200,000,000													200,000,000
Percentage of tangible net worth as of May 1, 2012 used for computing the tangible net worth to be maintained																		80.00%		80.00%
Cap on the entity's distributions as a percentage of taxable net income															100.00%
Loans held for investment reported by the Company	$ 409,943,000	$ 353,500,000																				$ 200,000,000