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REAL ESTATE SECURITIES - Summary of Securities (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) security | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) security
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Outstanding Face Amount |  | $ 3,630,654 |  | $ 3,341,630
Amortized Cost Basis/Purchase Price |  | 2,003,796 |  | 1,703,761
Gross Unrealized Gains |  | 3,527 |  | 5,779
Gross Unrealized Losses |  | (76,893) |  | (1,215)
Carrying Value |  | $ 1,930,430 |  | $ 1,708,325
Number of Securities | security |  | 161 |  | 159
Weighted Average Coupon |  | 1.48% |  | 1.84%
Weighted Average Yield |  | 2.25% |  | 3.06%
Remaining Duration |  | 2 years 3 months 25 days |  | 2 years 4 months 20 days
Number of equity securities | security |  | 3 |  | 2
Provision for current expected credit losses |  | $ (26,581) | $ (300) |
Amortized Cost Basis/Purchase Price |  | 2,004,394 |  | $ 1,716,609
Gross Unrealized Gains |  | 3,527 |  | 6,071
Total real estate securities, Gross Unrealized Losses |  | (77,316) |  | (1,375)
Carrying Value | [1] | $ 1,930,605 |  | $ 1,721,305
Total number of Securities | security |  | 164 |  | 161
CMBS |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Outstanding Face Amount |  | $ 1,943,507 |  | $ 1,640,597
Amortized Cost Basis/Purchase Price |  | 1,943,359 |  | 1,640,905
Gross Unrealized Gains |  | 1,476 |  | 4,337
Gross Unrealized Losses |  | (76,686) |  | (920)
Carrying Value |  | $ 1,868,149 |  | $ 1,644,322
Number of Securities | security |  | 127 |  | 125
Weighted Average Coupon |  | 2.20% |  | 3.06%
Weighted Average Yield |  | 2.21% |  | 3.08%
Remaining Duration |  | 2 years 3 months 21 days |  | 2 years 4 months 28 days
Risk retention requirement, amount |  | $ 11,600 |  | $ 11,600
CMBS interest-only |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Outstanding Face Amount |  | 1,550,358 |  | 1,559,160
Amortized Cost Basis/Purchase Price |  | 26,800 |  | 28,553
Gross Unrealized Gains |  | 1,044 |  | 630
Gross Unrealized Losses |  | (9) |  | (37)
Carrying Value |  | $ 27,835 |  | $ 29,146
Number of Securities | security |  | 15 |  | 15
Weighted Average Coupon |  | 0.60% |  | 0.60%
Weighted Average Yield |  | 2.99% |  | 3.04%
Remaining Duration |  | 2 years 5 months 15 days |  | 2 years 6 months 10 days
Risk retention requirement, amount |  | $ 800 |  | $ 800
GNMA interest-only |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Outstanding Face Amount |  | 105,009 |  | 109,783
Amortized Cost Basis/Purchase Price |  | 1,661 |  | 1,982
Gross Unrealized Gains |  | 139 |  | 123
Gross Unrealized Losses |  | (193) |  | (254)
Carrying Value |  | $ 1,607 |  | $ 1,851
Number of Securities | security |  | 11 |  | 11
Weighted Average Coupon |  | 0.46% |  | 0.49%
Weighted Average Yield |  | 4.86% |  | 4.59%
Remaining Duration |  | 3 years 18 days |  | 2 years 9 months 7 days
Agency securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Outstanding Face Amount |  | $ 621 |  | $ 629
Amortized Cost Basis/Purchase Price |  | 631 |  | 640
Gross Unrealized Gains |  | 2 |  | 1
Gross Unrealized Losses |  | (5) |  | (4)
Carrying Value |  | $ 628 |  | $ 637
Number of Securities | security |  | 2 |  | 2
Weighted Average Coupon |  | 2.63% |  | 2.65%
Weighted Average Yield |  | 1.70% |  | 1.73%
Remaining Duration |  | 1 year 8 months 12 days |  | 1 year 9 months 29 days
GNMA permanent securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Outstanding Face Amount |  | $ 31,159 |  | $ 31,461
Amortized Cost Basis/Purchase Price |  | 31,345 |  | 31,681
Gross Unrealized Gains |  | 866 |  | 688
Gross Unrealized Losses |  | 0 |  | 0
Carrying Value |  | $ 32,211 |  | $ 32,369
Number of Securities | security |  | 6 |  | 6
Weighted Average Coupon |  | 3.90% |  | 3.91%
Weighted Average Yield |  | 3.50% |  | 3.17%
Remaining Duration |  | 2 years 7 months 9 days |  | 1 year 11 months 4 days
Equity securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Amortized Cost Basis/Purchase Price |  | $ 598 |  | $ 12,848
Gross Unrealized Gains |  | 0 |  | 292
Total debt securities, Gross Unrealized Losses |  | (401) |  | (160)
Carrying Value |  | 197 |  | $ 12,980
Provision for current expected credit losses |  | (22) |  |
Provision for current expected credit losses |  | $ 22 |  |
[1] | Includes amounts relating to consolidated variable interest entities. See Note 1.

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