SUMMARY OF QUARTERLY CONSOLIDATED FINANCIAL INFORMATION (UNAUDITED) - Schedule of Quarterly Unaudited Summary Information (Details) - USD ($)												1 Months Ended	3 Months Ended																4 Months Ended	12 Months Ended
	Dec. 10, 2015	Sep. 18, 2015	May. 14, 2015	Mar. 16, 2015	Dec. 18, 2014	Sep. 18, 2014	Jun. 17, 2014	Mar. 19, 2014	Dec. 17, 2013	Sep. 18, 2013	Jun. 03, 2013	Jan. 31, 2014	Dec. 31, 2015		Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015		Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		May. 15, 2013	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Interest income													$ 200,181,000		$ 182,341,000		$ 178,177,000		$ 84,373,000		$ 85,124,000		$ 97,587,000		$ 92,656,000		$ 71,490,000			$ 645,072,000		$ 346,857,000		$ 87,567,000
Interest expense													80,605,000		77,558,000		81,871,000		33,979,000		31,892,000		33,307,000		36,512,000		38,997,000			274,013,000		140,708,000		15,024,000
Net interest income (expense)													119,576,000		104,783,000		96,306,000		50,394,000		53,232,000		64,280,000		56,144,000		32,493,000			371,059,000		206,149,000		72,543,000
Impairment
Other-than-temporary impairment (OTTI) on securities												$ 1,000,000	2,494,000		1,574,000		649,000		1,071,000		448,000		0		615,000		328,000			5,788,000		1,391,000		4,993,000
Valuation provision on loans and real estate owned													16,188,000		(3,341,000)		4,772,000		977,000		8,300,000		1,134,000		293,000		164,000			18,596,000		9,891,000		461,000
Total Impairment Charges													18,682,000		(1,767,000)		5,421,000		2,048,000		8,748,000		1,134,000		908,000		492,000			24,384,000		11,282,000		5,454,000
Net interest income after impairment													100,894,000		106,550,000		90,885,000		48,346,000		44,484,000		63,146,000		55,236,000		32,001,000			346,675,000		194,867,000		67,089,000
Other income													9,909,000	[1]	(17,825,000)	[1]	37,650,000	[1]	12,295,000	[1]	40,085,000	[1]	122,064,000	[1]	177,889,000	[1]	35,050,000	[1]		42,029,000	[1]	375,088,000	[1]	241,008,000
Operating expenses													27,699,000		32,902,000		34,952,000		22,270,000		40,167,000		25,311,000		29,522,000		9,899,000			117,823,000		104,899,000		42,474,000
Income (Loss) Before Income Taxes													83,104,000		55,823,000		93,583,000		38,371,000		44,402,000		159,899,000		203,603,000		57,152,000			270,881,000		465,056,000		265,623,000
Income tax expense (benefit)													(15,948,000)		(5,932,000)		14,306,000		(3,427,000)		(6,526,000)		7,801,000		21,395,000		287,000		$ 0	(11,001,000)		22,957,000		0
Net Income (Loss)													99,052,000		61,755,000		79,277,000		41,798,000		50,928,000		152,098,000		182,208,000		56,865,000			281,882,000		442,099,000		265,623,000
Noncontrolling Interests in Income (Loss) of Consolidated Subsidiaries													(3,928,000)		7,193,000		4,158,000		5,823,000		(3,302,000)		25,726,000		58,705,000		8,093,000			13,246,000		89,222,000		(326,000)
Net income (loss) attributable to common stockholders													$ 102,980,000		$ 54,562,000		$ 75,119,000		$ 35,975,000		$ 54,230,000		$ 126,372,000		$ 123,503,000		$ 48,772,000			$ 268,636,000		$ 352,877,000		$ 265,949,000
Net Income Per Share of Common Stock
Basic (in dollars per share)													$ 0.45		$ 0.24		$ 0.37		$ 0.25		$ 0.38		$ 0.89		$ 0.91		$ 0.39			$ 1.34		$ 2.59		$ 2.10
Diluted (in dollars per share)													$ 0.45		$ 0.24		$ 0.37		$ 0.25		$ 0.38		$ 0.88		$ 0.88		$ 0.38			$ 1.32		$ 2.53		$ 2.07
Weighted Average Number of Shares of Common Stock Outstanding
Basic (in shares)													230,459,000		230,455,568		200,910,040		141,434,905		141,395,307		141,211,580		136,465,454		126,604,510			200,739,809		136,472,865		126,539,024
Diluted (in shares)													230,698,961		231,215,235		205,169,099		144,911,309		144,294,088		144,166,601		139,668,128		129,919,967			202,907,605		139,565,709		128,684,128
Dividends Declared per Share of Common Stock (in dollars per share)	$ 0.46	$ 0.46	$ 0.45	$ 0.38	$ 0.38	$ 0.35	$ 0.5	$ 0.35	$ 0.5	$ 0.35	$ 0.14		$ 0.46		$ 0.46		$ 0.45		$ 0.38		$ 0.38		$ 0.35		$ 0.5		$ 0.35			$ 1.75		$ 1.58		$ 0.99

[1] Earnings from investments in equity method investees is included in other income.