SEGMENT REPORTING (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014 segment	Dec. 31, 2013	Dec. 31, 2012
SEGMENT REPORTING
Number of reportable segments									3
Interest income	$ 56,931,000	$ 48,459,000	$ 45,112,000	$ 36,822,000	$ 30,516,000	$ 29,633,000	$ 30,168,000	$ 31,261,000	$ 187,325,020	$ 121,577,676	$ 136,198,204
Interest expense									(77,574,167)	(48,744,659)	(36,440,373)
Net interest income									109,750,853	72,833,017	99,757,831
Provision for loan losses									(600,000)	(600,000)	(448,833)
Net interest income after provision for loan losses	30,728,000	28,381,000	28,211,000	21,831,000	17,324,000	16,929,000	18,076,000	19,904,000	109,150,853	72,233,017	99,308,998
Operating lease income									56,649,278	37,394,416	8,331,338
Tenant recoveries									9,182,952	3,271,095	0
Sale of loans, net									145,274,603	146,708,264	151,661,150
Gain on securities									26,977,268	4,230,953	19,013,960
Unrealized gain (loss) on Agency interest-only securities									2,143,765	(2,665,188)	(5,680,893)
Sale of real estate, net									29,760,115	13,565,164	1,275,235
Fee income									11,703,791	7,921,430	8,787,695
Net result from derivative transactions									(94,797,755)	28,075,232	(35,650,989)
Earnings from investment in unconsolidated joint ventures									1,990,117	3,203,358	1,256,109
Gain on assignment of mortgage loan financing									431,465	0	0
Loss on extinguishment of debt									(149,738)	0	0
Total other income	31,906,000	61,337,000	55,489,000	40,434,000	36,227,000	35,525,000	70,346,000	99,606,000	189,165,861	241,704,724	148,993,605
Salaries and employee benefits									(82,143,674)	(61,038,260)	(51,090,424)
Operating expenses									(25,397,672)	(14,937,488)	(9,571,881)
Real estate operating expenses									(32,670,045)	(17,403,945)	0
Real estate acquisition costs									(2,403,450)	(3,625,773)	(5,797,213)
Fee expense									(3,023,409)	(2,954,839)	(6,164,187)
Depreciation and amortization									(28,447,437)	(21,514,572)	(3,640,619)
Total costs and expenses	(48,045,000)	(42,207,000)	(45,258,000)	(38,575,000)	(33,528,000)	(30,603,000)	(27,951,000)	(29,393,000)	(174,085,687)	(121,474,877)	(76,264,324)
Tax expense									(26,604,776)	(3,729,778)	(2,583,999)
Net income	11,806,000	37,176,000	30,243,000	18,401,000	19,744,000	21,187,000	59,752,000	88,050,000	97,626,251	188,733,086	169,454,280
Total assets	5,823,660,960				3,489,063,267				5,823,660,960	3,489,063,267
Company’s investment in unconsolidated joint ventures	6,041,333				9,262,762				6,041,333	9,262,762
Investment in FHLB stock	72,340,000				49,450,000				72,340,000	49,450,000
Deferred tax assets	8,300,559				0				8,300,559	0
Operating Segment | Loans
SEGMENT REPORTING
Interest income									113,943,457	63,894,000	56,835,000
Interest expense									(13,205,000)	(4,592,000)	(9,212,000)
Net interest income									100,738,000	59,302,000	47,623,000
Provision for loan losses									(600,000)	(600,000)	(449,000)
Net interest income after provision for loan losses									100,138,000	58,702,000	47,174,000
Operating lease income									0	0	0
Tenant recoveries									0	0
Sale of loans, net									145,275,000	146,708,000	151,661,000
Gain on securities									0	0	0
Unrealized gain (loss) on Agency interest-only securities									0	0	0
Sale of real estate, net									1,525,000	0	0
Fee income									3,854,000	2,963,000	6,886,000
Net result from derivative transactions									(34,599,000)	15,836,000	(25,236,000)
Earnings from investment in unconsolidated joint ventures									0	0	0
Gain on assignment of mortgage loan financing									0
Loss on extinguishment of debt									0
Total other income									116,055,000	165,507,000	133,311,000
Salaries and employee benefits									(22,400,000)	(26,250,000)	(21,500,000)
Operating expenses									235,000	201,000	0
Real estate operating expenses									0	0	0
Real estate acquisition costs									0	0
Fee expense									(2,172,000)	(1,981,000)	(5,635,000)
Depreciation and amortization									0	0	0
Total costs and expenses									(24,337,000)	(28,030,000)	(27,135,000)
Tax expense									0	0	0
Net income									191,856,000	196,179,000	153,350,000
Total assets	1,939,008,000				979,568,000				1,939,008,000	979,568,000
Operating Segment | Securities
SEGMENT REPORTING
Interest income									73,330,827	57,636,000	80,613,000
Interest expense									(6,588,000)	(3,289,000)	(15,807,000)
Net interest income									66,743,000	54,347,000	64,806,000
Provision for loan losses									0	0	0
Net interest income after provision for loan losses									66,743,000	54,347,000	64,806,000
Operating lease income									0	0	0
Tenant recoveries									0	0
Sale of loans, net									0	0	0
Gain on securities									26,977,000	4,231,000	19,014,000
Unrealized gain (loss) on Agency interest-only securities									2,144,000	(2,665,000)	(5,681,000)
Sale of real estate, net									0	0	0
Fee income									0	195,000	251,000
Net result from derivative transactions									(60,199,000)	12,239,000	(10,415,000)
Earnings from investment in unconsolidated joint ventures									0	0	0
Gain on assignment of mortgage loan financing									0
Loss on extinguishment of debt									0
Total other income									(31,078,000)	14,000,000	3,169,000
Salaries and employee benefits									0	0	0
Operating expenses									0	0	0
Real estate operating expenses									0	0	0
Real estate acquisition costs									0	0
Fee expense									(65,000)	(375,000)	(107,000)
Depreciation and amortization									0	0	0
Total costs and expenses									(65,000)	(375,000)	(107,000)
Tax expense									0	0	0
Net income									35,600,000	67,972,000	67,868,000
Total assets	2,815,566,000				1,657,246,000				2,815,566,000	1,657,246,000
Operating Segment | Real Estate
SEGMENT REPORTING
Interest income									0	0	0
Interest expense									(15,984,000)	(7,673,000)	(3,595,000)
Net interest income									(15,984,000)	(7,673,000)	(3,595,000)
Provision for loan losses									0	0	0
Net interest income after provision for loan losses									(15,984,000)	(7,673,000)	(3,595,000)
Operating lease income									56,649,000	37,394,000	8,331,000
Tenant recoveries									9,183,000	3,271,000
Sale of loans, net									0	0	0
Gain on securities									0	0	0
Unrealized gain (loss) on Agency interest-only securities									0	0	0
Sale of real estate, net									28,235,000	13,565,000	1,275,000
Fee income									5,374,000	312,000	823,000
Net result from derivative transactions									0	0	0
Earnings from investment in unconsolidated joint ventures									900,000	0	0
Gain on assignment of mortgage loan financing									431,000
Loss on extinguishment of debt									0
Total other income									100,772,000	54,542,000	10,429,000
Salaries and employee benefits									0	0	0
Operating expenses									0	(7,000)	(672,000)
Real estate operating expenses									(32,670,000)	(17,404,000)	(5,797,000)
Real estate acquisition costs									(2,399,000)	(3,626,000)
Fee expense									(83,000)	(33,000)	(128,000)
Depreciation and amortization									(28,271,000)	(20,967,000)	(3,093,000)
Total costs and expenses									(63,423,000)	(42,037,000)	(9,690,000)
Tax expense									0	0	0
Net income									21,365,000	4,832,000	(2,856,000)
Total assets	771,129,000				626,362,000				771,129,000	626,362,000
Corporate / Other
SEGMENT REPORTING
Interest income									50,736	48,000	(1,250,000)
Interest expense									(41,797,000)	(33,191,000)	(7,826,000)
Net interest income									(41,746,000)	(33,143,000)	(9,076,000)
Provision for loan losses									0	0	0
Net interest income after provision for loan losses									(41,746,000)	(33,143,000)	(9,076,000)
Operating lease income									0	0	0
Tenant recoveries									0	0
Sale of loans, net									0	0	0
Gain on securities									0	0	0
Unrealized gain (loss) on Agency interest-only securities									0	0	0
Sale of real estate, net									0	0	0
Fee income									2,476,000	4,452,000	828,000
Net result from derivative transactions									0	0	0
Earnings from investment in unconsolidated joint ventures									1,090,000	3,203,000	1,256,000
Gain on assignment of mortgage loan financing									0
Loss on extinguishment of debt									(150,000)
Total other income									3,416,000	7,655,000	2,084,000
Salaries and employee benefits									(59,744,000)	(34,788,000)	(29,590,000)
Operating expenses									(25,633,000)	(15,131,000)	(8,900,000)
Real estate operating expenses									0	0	0
Real estate acquisition costs									(4,000)	0
Fee expense									(703,000)	(566,000)	(294,000)
Depreciation and amortization									(176,000)	(547,000)	(548,000)
Total costs and expenses									(86,260,000)	(51,032,000)	(39,332,000)
Tax expense									(26,605,000)	(3,730,000)	(2,584,000)
Net income									(151,195,000)	(80,250,000)	(48,908,000)
Total assets	297,958,000				225,887,000				297,958,000	225,887,000
Grace Lake JV, LLC
SEGMENT REPORTING
Earnings from investment in unconsolidated joint ventures									900,000	635,000	0
Company’s investment in unconsolidated joint ventures	2,142,898				2,142,898				2,142,898	2,142,898
LCRIP I
SEGMENT REPORTING
Fee income									391,955	785,925	744,182
Earnings from investment in unconsolidated joint ventures									1,090,117	2,568,358	1,256,109
Company’s investment in unconsolidated joint ventures	$ 3,898,435				$ 7,119,864				$ 3,898,435	$ 7,119,864