LOANS HELD FOR INVESTMENT (Details) (USD $)	3 Months Ended			3 Months Ended												3 Months Ended											3 Months Ended							3 Months Ended		3 Months Ended
	Mar. 31, 2013 item	Mar. 31, 2012	Dec. 31, 2012	Mar. 31, 2013 Apartment Building in Brandon, FL item	Mar. 31, 2013 Office Complex in Austin, TX item	Mar. 31, 2013 Office Building in Cincinnati, OH item	Mar. 31, 2013 Apartment Building in New York, NY	Mar. 31, 2013 Apartment Building in New York, NY item	Mar. 31, 2013 Apartment Building in Overland Park, KS	Mar. 31, 2013 Apartment Complex in Avondale, AZ item	Mar. 31, 2013 Apartment Building in New York, NY item	Mar. 31, 2013 Apartment Building in New York, NY item	Mar. 31, 2013 Office Building in Denver, CO	Mar. 31, 2013 Office Building in Miami, FL item	Mar. 08, 2013 Office Building in Miami, FL	Mar. 31, 2013 Office Building in Boston, MA item	Mar. 31, 2013 Apartment Building in Arlington, VA item	Mar. 31, 2013 Apartment Building in Atlanta, GA item	Mar. 31, 2013 Apartment Building in Rocklin, CA item	Mar. 31, 2013 Office Building in Fort Lauderdale, FL item	Mar. 31, 2013 Office Building in Atlanta, GA	Mar. 31, 2013 Minimum Office Complex in Austin, TX	Mar. 31, 2013 Minimum Office Building in Cincinnati, OH	Mar. 31, 2013 Minimum Apartment Building in New York, NY	Mar. 31, 2013 Minimum Apartment Building in New York, NY	Mar. 31, 2013 Minimum Apartment Building in New York, NY	Mar. 31, 2013 Minimum Office Building in Miami, FL	Mar. 31, 2013 Minimum Office Building in Fort Lauderdale, FL	Mar. 31, 2013 Maximum Office Complex in Austin, TX	Mar. 31, 2013 Maximum Office Building in Cincinnati, OH	Mar. 31, 2013 Maximum Apartment Building in New York, NY	Mar. 31, 2013 Maximum Apartment Building in New York, NY	Mar. 31, 2013 Maximum Apartment Building in New York, NY	Mar. 31, 2013 Maximum Office Building in Miami, FL	Mar. 31, 2013 Maximum Office Building in Fort Lauderdale, FL	Mar. 31, 2013 A-Note/B-Note Apartment Building in Atlanta, GA	Mar. 31, 2013 A-Note/B-Note Apartment Building in Rocklin, CA	Mar. 31, 2013 A-Note/B-Note Office Building in Fort Lauderdale, FL	Mar. 31, 2013 A-Note Apartment Building in Atlanta, GA	Mar. 31, 2013 A-Note Apartment Building in Rocklin, CA	Mar. 31, 2013 A-Note Office Building in Fort Lauderdale, FL	Mar. 31, 2013 B-Note Apartment Building in Atlanta, GA	Mar. 31, 2013 B-Note Apartment Building in Atlanta, GA LIBOR rate equal to 0	Mar. 31, 2013 B-Note Apartment Building in Atlanta, GA LIBOR rate equal to 0.50 percent	Mar. 31, 2013 B-Note Apartment Building in Atlanta, GA LIBOR rate greater than 0.50 percent	Mar. 31, 2013 B-Note Apartment Building in Rocklin, CA	Mar. 31, 2013 B-Note Apartment Building in Rocklin, CA LIBOR rate equal to 0	Mar. 31, 2013 B-Note Apartment Building in Rocklin, CA LIBOR rate equal to 1 percent	Mar. 31, 2013 B-Note Apartment Building in Rocklin, CA LIBOR rate greater than 1 percent	Mar. 31, 2013 B-Note Office Building in Fort Lauderdale, FL	Mar. 31, 2013 B-Note Minimum Apartment Building in Atlanta, GA	Mar. 31, 2013 Transitional first mortgage loan Office Building in Fort Lauderdale, FL
LOANS HELD FOR INVESTMENT
Number of loans originated or co-originated	17
Amount funded	$ 56,299,000	$ 73,147,000
Amount of repayments	56,000
Loans held for investment
Total Commitment	470,200,000			49,600,000	38,000,000	35,500,000	36,100,000	26,300,000	25,500,000	22,100,000	21,900,000	21,800,000	11,000,000	47,000,000		35,000,000	13,400,000	39,000,000	18,700,000	15,000,000	14,300,000																													15,000,000		37,000,000
Outstanding Principal	412,993,000			44,200,000	31,400,000	27,000,000	32,200,000	23,000,000	24,400,000	20,700,000	18,700,000	18,800,000	9,700,000	47,000,000	47,000,000	34,800,000	13,400,000	26,700,000	18,700,000	8,000,000	14,300,000																					39,000,000				50,500,000
Carrying Amount	409,943,000		353,500,000	43,800,000	31,100,000	26,900,000	31,900,000	22,800,000	24,100,000	20,600,000	18,600,000	18,700,000	9,600,000	46,900,000		34,500,000	13,300,000	26,500,000	18,500,000	7,900,000	14,200,000
Basis spread (as a percent)				4.80%			5.00%	5.00%	5.00%	4.25%	5.00%	5.00%	5.50%	5.25%		5.65%	5.15%	10.70%	6.40%			5.25%	5.00%	5.00%	5.00%	5.00%		10.75%	5.75%	5.35%	5.75%	5.75%	5.75%		8.18%								12.50%	10.70%	10.70%	6.40%	9.10%	7.40%	6.40%	8.18%
Fixed interest rate (as a percent)																					10.50%
LIBOR Floor (as a percent)				0.50%	1.00%	0.30%	0.80%	0.20%	0.30%	1.00%	0.20%	0.20%	1.00%	1.00%		0.70%	0.30%	0.50%	1.00%	0.80%																0.50%	1.00%	0.75%	0.00%	0.00%	0.75%	0.50%				1.00%				0.75%	0.50%
Basis spread due to modification (as a percent)																																													8.90%
LIBOR Floor due to modification (as a percent)																																													0.50%
Basis spread after modification (as a percent)																																											10.30%		8.90%
Unleveraged Effective Yield (as a percent)	7.00%			5.90%	7.60%	6.10%	6.30%	6.70%	5.90%	5.80%	6.70%	6.70%	7.30%	6.60%		6.80%	6.20%	12.10%	9.90%	12.70%	11.00%
Base rate				30-day LIBOR	30-day LIBOR	30-day LIBOR	30-day LIBOR	30-day LIBOR	30-day LIBOR	30-day LIBOR	30-day LIBOR	30-day LIBOR	30-day LIBOR	30-day LIBOR		30-day LIBOR	30-day LIBOR	30-day LIBOR	30-day LIBOR	30-day LIBOR																30-day LIBOR	30-day LIBOR	30-day LIBOR	30-day LIBOR	30-day LIBOR	30-day LIBOR	30-day LIBOR	30-day LIBOR	30-day LIBOR	30-day LIBOR	30-day LIBOR	30-day LIBOR	30-day LIBOR	30-day LIBOR	30-day LIBOR
Number of extension options				2	2	2	2	2		2	2	2		1		1	1	2	1	2
Period of extension options				12 months	12 months	12 months	12 months	12 months		12 months	12 months	12 months		12 months		12 months	12 months	12 months	6 months	12 months
Percentage of loans held for investment in total assets																											10.00%							20.00%
Basis spread (as a percent)																																				4.95%	4.10%	5.25%	2.70%	2.75%	3.25%	10.70%				6.40%
Fully funding amount																																									$ 22,000,000									$ 15,000,000
Increased interest rate (as a percent)																					11.00%