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FAIR VALUE OF FINANCIAL INSTRUMENTS - Estimated Fair Values of Financial Instruments (Details) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2019 USD ($)	Mar. 31, 2018	Dec. 31, 2018 USD ($)
Assets:
Carrying Value		$ 1,607,977		$ 1,398,576
Fair Value		3,585,739		3,564,681
Provision for loan losses	[1]	(18,200)		(17,900)
Liabilities:
Fair Value		4,748,031		4,401,295
Recurring
Assets:
Fair Value		1,608,192		1,397,918
CMBS
Assets:
Carrying Value		1,481,640		1,252,640
CMBS | Recurring | Internal Model Third Party Inputs Valuation Technique
Assets:
Outstanding Face Amount		1,475,469		1,258,819
Amortized Cost Basis/Purchase Price		1,475,900		$ 1,257,801
Fair Value		$ 1,481,640
Debt securities, available-for-sale, measurement input		0.0328		0.0314
Liabilities:
Weighted average remaining maturity/duration		2 years 6 months		2 years 3 months 29 days
CMBS interest-only
Assets:
Carrying Value		$ 53,570		$ 55,691
CMBS interest-only | Recurring | Internal Model Third Party Inputs Valuation Technique
Assets:
Outstanding Face Amount		2,436,543		2,373,936
Amortized Cost Basis/Purchase Price		52,682		$ 55,534
Fair Value		$ 53,570
Debt securities, available-for-sale, measurement input		0.0356		0.0280
Liabilities:
Weighted average remaining maturity/duration		2 years 7 months 6 days		2 years 8 months 8 days
GNMA interest-only
Assets:
Carrying Value		$ 2,491		$ 2,648
GNMA interest-only | Recurring | Internal Model Third Party Inputs Valuation Technique
Assets:
Outstanding Face Amount		123,684		135,932
Amortized Cost Basis/Purchase Price		2,694		$ 2,862
Fair Value		$ 2,491
Debt securities, available-for-sale, measurement input		0.0909		0.0630
Liabilities:
Weighted average remaining maturity/duration		2 years 6 months 21 days		4 years 1 month 9 days
Agency securities
Assets:
Carrying Value		$ 661		$ 662
Agency securities | Recurring | Internal Model Third Party Inputs Valuation Technique
Assets:
Outstanding Face Amount		660		668
Amortized Cost Basis/Purchase Price		673		$ 682
Fair Value		$ 661
Debt securities, available-for-sale, measurement input		0.0181		0.0183
Liabilities:
Weighted average remaining maturity/duration		2 years 2 months 26 days		2 years 4 months 9 days
GNMA permanent securities
Assets:
Carrying Value		$ 33,006		$ 33,064
GNMA permanent securities | Recurring | Internal Model Third Party Inputs Valuation Technique
Assets:
Outstanding Face Amount		32,346		32,633
Amortized Cost Basis/Purchase Price		32,592		$ 32,889
Fair Value		$ 33,006
Debt securities, available-for-sale, measurement input		0.0375		0.0376
Liabilities:
Weighted average remaining maturity/duration		4 years 10 months 13 days		5 years 10 days
Corporate bonds
Assets:
Carrying Value		$ 36,609		$ 53,871
Corporate bonds | Recurring | Internal Model Third Party Inputs Valuation Technique
Assets:
Outstanding Face Amount		36,441		55,305
Amortized Cost Basis/Purchase Price		35,682		$ 54,257
Fair Value		$ 36,609
Debt securities, available-for-sale, measurement input		0.05		0.0504
Liabilities:
Weighted average remaining maturity/duration		1 year 10 months 17 days		2 years 6 months 3 days
Common Stock | Recurring | Internal Model Third Party Inputs Valuation Technique
Assets:
Amortized Cost Basis/Purchase Price		$ 10,678		$ 13,154
Fair Value		$ 11,151		11,550
Mortgage loan receivables held for investment, net, at amortized cost
Liabilities:
Period of short interest rate reset risk		30 days	30 days
Mortgage loan receivables held for investment, net, at amortized cost | Recurring | Internal Model Third Party Inputs Valuation Technique
Assets:
Outstanding Face Amount		$ 3,321,828
Mortgage loan receivables held for investment, net, at amortized cost | Recurring | Discounted Cash Flow
Assets:
Outstanding Face Amount				3,340,381
Amortized Cost Basis/Purchase Price		3,302,753		3,318,390
Fair Value		$ 3,311,885		$ 3,324,588
Debt securities, available-for-sale, measurement input		0.0768		0.0784
Liabilities:
Weighted average remaining maturity/duration		1 year 2 months 12 days		1 year 3 months 25 days
Mortgage loans transferred but not considered sold | Recurring
Assets:
Outstanding Face Amount		$ 15,350
Amortized Cost Basis/Purchase Price		15,504
Fair Value		$ 15,504
Debt securities, available-for-sale, measurement input		0.0529
Liabilities:
Weighted average remaining maturity/duration		9 years 9 months 10 days
Provisions For Loan Losses | Recurring
Assets:
Provision for loan losses		$ (18,200)		$ (17,900)
Mortgage loan receivables held for sale | Recurring | Internal Model Third Party Inputs Valuation Technique
Assets:
Outstanding Face Amount		189,334		181,905
Amortized Cost Basis/Purchase Price		189,525		182,439
Fair Value		$ 202,363		$ 187,870
Debt securities, available-for-sale, measurement input		0.0553		0.0546
Liabilities:
Weighted average remaining maturity/duration		9 years 6 months 21 days		9 years 9 months
FHLB stock | Recurring | FHLB stock
Assets:
Outstanding Face Amount		$ 61,619		$ 57,915
Amortized Cost Basis/Purchase Price		61,619		57,915
Fair Value		$ 61,619		$ 57,915
Debt securities, available-for-sale, measurement input		0.0550		0.0450
Nonhedge derivatives | Recurring | Counterparty Quotations Valuation Technique
Assets:
Nonhedge derivative assets		$ 454,571		$ 0
Fair Value		$ 1,632		$ 0
Liabilities:
Weighted average remaining maturity/duration		3 months		0 years
Repurchase agreements - short-term | Recurring | Discounted Cash Flow
Assets:
Debt securities, available-for-sale, measurement input		0.0330		0.0342
Liabilities:
Outstanding Face Amount		$ 804,986		$ 436,957
Amortized Cost Basis/Purchase Price		804,986		436,957
Fair Value		$ 804,986		$ 436,957
Weighted average remaining maturity/duration		2 months 26 days		2 months 23 days
Repurchase agreements - long-term | Recurring | Discounted Cash Flow
Assets:
Debt securities, available-for-sale, measurement input		0.0335		0.0347
Liabilities:
Outstanding Face Amount		$ 225,096		$ 226,728
Amortized Cost Basis/Purchase Price		225,096		226,728
Fair Value		$ 225,096		$ 226,728
Weighted average remaining maturity/duration		1 year 6 months 18 days		1 year 8 months 23 days
Mortgage loan financing | Recurring | Discounted Cash Flow
Assets:
Debt securities, available-for-sale, measurement input		0.0510		0.0509
Liabilities:
Outstanding Face Amount		$ 734,319		$ 738,825
Amortized Cost Basis/Purchase Price		739,500		743,902
Fair Value		$ 740,221		$ 735,662
Weighted average remaining maturity/duration		2 years 3 months 29 days		2 years 7 months 9 days
CLO debt
Liabilities:
Period of short interest rate reset risk		30 days	30 days
CLO debt | Recurring | Discounted Cash Flow
Assets:
Debt securities, available-for-sale, measurement input		0.0465		0.0441
Liabilities:
Outstanding Face Amount		$ 497,334		$ 601,543
Amortized Cost Basis/Purchase Price		497,334		601,543
Fair Value		$ 497,334		$ 601,543
Weighted average remaining maturity/duration		8 years 1 month 24 days		9 years 4 months 24 days
Participation Financing - Mortgage Loan Receivable | Recurring | Discounted Cash Flow
Assets:
Debt securities, available-for-sale, measurement input		0.1700		0.1700
Liabilities:
Outstanding Face Amount		$ 2,393		$ 2,453
Amortized Cost Basis/Purchase Price		2,393		2,453
Fair Value		$ 2,393		$ 2,453
Weighted average remaining maturity/duration		2 months 4 days		5 months 4 days
Borrowings from the FHLB | Recurring | Discounted Cash Flow
Assets:
Debt securities, available-for-sale, measurement input		0.0261		0.0255
Liabilities:
Outstanding Face Amount		$ 1,291,449		$ 1,286,000
Amortized Cost Basis/Purchase Price		1,291,449		1,286,000
Fair Value		$ 1,295,087		$ 1,286,664
Weighted average remaining maturity/duration		2 years 4 months 24 days		2 years 5 months 15 days
Senior unsecured notes | Recurring | Broker Quotations Pricing Services Valuation Technique
Assets:
Debt securities, available-for-sale, measurement input		0.0539		0.0539
Liabilities:
Outstanding Face Amount		$ 1,166,201		$ 1,166,201
Amortized Cost Basis/Purchase Price		1,155,692		1,154,991
Fair Value		$ 1,167,074		$ 1,111,288
Weighted average remaining maturity/duration		4 years 10 days		4 years 3 months 10 days
Nonhedge derivatives | Recurring | Counterparty Quotations Valuation Technique
Liabilities:
Nonhedge derivative liabilities				$ 578,971
Fair Value				$ 975
Weighted average remaining maturity/duration				3 months
Liability For Transfers Not Considered Sales
Liabilities:
Outstanding Face Amount		$ 15,840
Fair Value		$ 15,840
Liability For Transfers Not Considered Sales | Recurring | Discounted Cash Flow
Assets:
Debt securities, available-for-sale, measurement input		0.0529
Liabilities:
Outstanding Face Amount		$ 15,840
Amortized Cost Basis/Purchase Price		15,840
Fair Value		$ 15,840
Weighted average remaining maturity/duration		9 years 9 months 10 days
Level 3
Assets:
Carrying Value		$ 1,607,977
Fair Value		3,585,739		$ 3,564,681
Provision for loan losses		(18,200)		(17,900)
Liabilities:
Fair Value		4,748,031		4,401,295
Level 3 | Internal Model Third Party Inputs Valuation Technique
Assets:
Carrying Value				1,398,576
Level 3 | Recurring
Assets:
Fair Value		1,595,409		1,386,368
Level 3 | CMBS
Assets:
Carrying Value		1,481,640
Level 3 | CMBS | Recurring | Internal Model Third Party Inputs Valuation Technique
Assets:
Carrying Value				1,252,640
Level 3 | CMBS interest-only
Assets:
Carrying Value		53,570
Level 3 | CMBS interest-only | Recurring | Internal Model Third Party Inputs Valuation Technique
Assets:
Carrying Value				55,691
Level 3 | GNMA interest-only
Assets:
Carrying Value		2,491
Level 3 | GNMA interest-only | Recurring | Internal Model Third Party Inputs Valuation Technique
Assets:
Carrying Value				2,648
Level 3 | Agency securities
Assets:
Carrying Value		661
Level 3 | Agency securities | Recurring | Internal Model Third Party Inputs Valuation Technique
Assets:
Carrying Value				662
Level 3 | GNMA permanent securities
Assets:
Carrying Value		33,006
Level 3 | GNMA permanent securities | Recurring | Internal Model Third Party Inputs Valuation Technique
Assets:
Carrying Value				33,064
Level 3 | Corporate bonds
Assets:
Carrying Value		36,609
Level 3 | Corporate bonds | Recurring | Internal Model Third Party Inputs Valuation Technique
Assets:
Carrying Value				53,871
Fair Value				$ 53,871
Level 3 | Liability For Transfers Not Considered Sales
Liabilities:
Fair Value		$ 15,840
[1] Includes amounts relating to consolidated variable interest entities. See Note 3.

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