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FAIR VALUE OF FINANCIAL INSTRUMENTS - Summary of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |  |
Fair value of assets |  | $ 3,585,739 | $ 3,564,681
Provision for loan losses | [1] | (18,200) | (17,900)
Liabilities: |  |  |
Fair value of liabilities |  | 4,748,031 | 4,401,295
Repurchase agreements - short-term |  |  |
Liabilities: |  |  |
Outstanding Face Amount |  | 804,986 | 436,957
Fair value of liabilities |  | 804,986 | 436,957
Repurchase agreements - long-term |  |  |
Liabilities: |  |  |
Outstanding Face Amount |  | 225,096 | 226,728
Fair value of liabilities |  | 225,096 | 226,728
Mortgage loan financing |  |  |
Liabilities: |  |  |
Outstanding Face Amount |  | 734,319 | 738,825
Fair value of liabilities |  | 740,221 | 735,662
CLO debt |  |  |
Liabilities: |  |  |
Outstanding Face Amount |  | 497,334 | 601,543
Fair value of liabilities |  | 497,334 | 601,543
Participation Financing - Mortgage Loan Receivable |  |  |
Liabilities: |  |  |
Outstanding Face Amount |  | 2,393 | 2,453
Fair value of liabilities |  | 2,393 | 2,453
Senior unsecured notes |  |  |
Liabilities: |  |  |
Outstanding Face Amount |  | 1,166,201 | 1,166,201
Fair value of liabilities |  | 1,167,074 | 1,111,288
Borrowings from the FHLB |  |  |
Liabilities: |  |  |
Outstanding Face Amount |  | 1,291,449 | 1,286,000
Fair value of liabilities |  | 1,295,087 | 1,286,664
Liability For Transfers Not Considered Sales |  |  |
Liabilities: |  |  |
Outstanding Face Amount |  | 15,840 |
Fair value of liabilities |  | 15,840 |
CMBS |  |  |
Assets: |  |  |
Outstanding Face Amount |  | 12,188 | 12,210
Fair value of assets |  | 11,662 | 11,306
CMBS interest-only |  |  |
Assets: |  |  |
Outstanding Face Amount |  | 11,166 | 11,189
Fair value of assets |  | 906 | 902
Mortgage loan receivables held for investment, net, at amortized cost |  |  |
Assets: |  |  |
Outstanding Face Amount |  | 3,321,828 | 3,340,381
Fair value of assets |  | 3,311,885 | 3,324,588
Mortgage loans transferred but not considered sold |  |  |
Assets: |  |  |
Outstanding Face Amount |  | 15,350 |
Fair value of assets |  | 15,504 |
Mortgage loan receivables held for sale |  |  |
Assets: |  |  |
Outstanding Face Amount |  | 189,334 | 181,905
Fair value of assets |  | 202,363 | 187,870
FHLB stock |  |  |
Assets: |  |  |
Outstanding Face Amount |  | 61,619 | 57,915
Fair value of assets |  | 61,619 | 57,915
Level 1 |  |  |
Assets: |  |  |
Fair value of assets |  | 0 | 0
Provision for loan losses |  | 0 | 0
Liabilities: |  |  |
Fair value of liabilities |  | 0 | 0
Level 1 | Repurchase agreements - short-term |  |  |
Liabilities: |  |  |
Fair value of liabilities |  | 0 | 0
Level 1 | Repurchase agreements - long-term |  |  |
Liabilities: |  |  |
Fair value of liabilities |  | 0 | 0
Level 1 | Mortgage loan financing |  |  |
Liabilities: |  |  |
Fair value of liabilities |  | 0 | 0
Level 1 | CLO debt |  |  |
Liabilities: |  |  |
Fair value of liabilities |  | 0 | 0
Level 1 | Participation Financing - Mortgage Loan Receivable |  |  |
Liabilities: |  |  |
Fair value of liabilities |  | 0 | 0
Level 1 | Senior unsecured notes |  |  |
Liabilities: |  |  |
Fair value of liabilities |  | 0 | 0
Level 1 | Borrowings from the FHLB |  |  |
Liabilities: |  |  |
Fair value of liabilities |  | 0 | 0
Level 1 | Liability For Transfers Not Considered Sales |  |  |
Liabilities: |  |  |
Fair value of liabilities |  | 0 |
Level 1 | CMBS |  |  |
Assets: |  |  |
Fair value of assets |  | 0 | 0
Level 1 | CMBS interest-only |  |  |
Assets: |  |  |
Fair value of assets |  | 0 | 0
Level 1 | Mortgage loan receivables held for investment, net, at amortized cost |  |  |
Assets: |  |  |
Fair value of assets |  | 0 | 0
Level 1 | Mortgage loans transferred but not considered sold |  |  |
Assets: |  |  |
Fair value of assets |  | 0 |
Level 1 | Mortgage loan receivables held for sale |  |  |
Assets: |  |  |
Fair value of assets |  | 0 | 0
Level 1 | FHLB stock |  |  |
Assets: |  |  |
Fair value of assets |  | 0 | 0
Level 2 |  |  |
Assets: |  |  |
Fair value of assets |  | 0 | 0
Provision for loan losses |  | 0 | 0
Liabilities: |  |  |
Fair value of liabilities |  | 0 | 0
Level 2 | Repurchase agreements - short-term |  |  |
Liabilities: |  |  |
Fair value of liabilities |  | 0 | 0
Level 2 | Repurchase agreements - long-term |  |  |
Liabilities: |  |  |
Fair value of liabilities |  | 0 | 0
Level 2 | Mortgage loan financing |  |  |
Liabilities: |  |  |
Fair value of liabilities |  | 0 | 0
Level 2 | CLO debt |  |  |
Liabilities: |  |  |
Fair value of liabilities |  | 0 | 0
Level 2 | Participation Financing - Mortgage Loan Receivable |  |  |
Liabilities: |  |  |
Fair value of liabilities |  | 0 | 0
Level 2 | Senior unsecured notes |  |  |
Liabilities: |  |  |
Fair value of liabilities |  | 0 | 0
Level 2 | Borrowings from the FHLB |  |  |
Liabilities: |  |  |
Fair value of liabilities |  | 0 | 0
Level 2 | Liability For Transfers Not Considered Sales |  |  |
Liabilities: |  |  |
Fair value of liabilities |  | 0 |
Level 2 | CMBS |  |  |
Assets: |  |  |
Fair value of assets |  | 0 | 0
Level 2 | CMBS interest-only |  |  |
Assets: |  |  |
Fair value of assets |  | 0 | 0
Level 2 | Mortgage loan receivables held for investment, net, at amortized cost |  |  |
Assets: |  |  |
Fair value of assets |  | 0 | 0
Level 2 | Mortgage loans transferred but not considered sold |  |  |
Assets: |  |  |
Fair value of assets |  | 0 |
Level 2 | Mortgage loan receivables held for sale |  |  |
Assets: |  |  |
Fair value of assets |  | 0 | 0
Level 2 | FHLB stock |  |  |
Assets: |  |  |
Fair value of assets |  | 0 | 0
Level 3 |  |  |
Assets: |  |  |
Fair value of assets |  | 3,585,739 | 3,564,681
Provision for loan losses |  | (18,200) | (17,900)
Liabilities: |  |  |
Fair value of liabilities |  | 4,748,031 | 4,401,295
Level 3 | Repurchase agreements - short-term |  |  |
Liabilities: |  |  |
Fair value of liabilities |  | 804,986 | 436,957
Level 3 | Repurchase agreements - long-term |  |  |
Liabilities: |  |  |
Fair value of liabilities |  | 225,096 | 226,728
Level 3 | Mortgage loan financing |  |  |
Liabilities: |  |  |
Fair value of liabilities |  | 740,221 | 735,662
Level 3 | CLO debt |  |  |
Liabilities: |  |  |
Fair value of liabilities |  | 497,334 | 601,543
Level 3 | Participation Financing - Mortgage Loan Receivable |  |  |
Liabilities: |  |  |
Fair value of liabilities |  | 2,393 | 2,453
Level 3 | Senior unsecured notes |  |  |
Liabilities: |  |  |
Fair value of liabilities |  | 1,167,074 | 1,111,288
Level 3 | Borrowings from the FHLB |  |  |
Liabilities: |  |  |
Fair value of liabilities |  | 1,295,087 | 1,286,664
Level 3 | Liability For Transfers Not Considered Sales |  |  |
Liabilities: |  |  |
Fair value of liabilities |  | 15,840 |
Level 3 | CMBS |  |  |
Assets: |  |  |
Fair value of assets |  | 11,662 | 11,306
Level 3 | CMBS interest-only |  |  |
Assets: |  |  |
Fair value of assets |  | 906 | 902
Level 3 | Mortgage loan receivables held for investment, net, at amortized cost |  |  |
Assets: |  |  |
Fair value of assets |  | 3,311,885 | 3,324,588
Level 3 | Mortgage loans transferred but not considered sold |  |  |
Assets: |  |  |
Fair value of assets |  | 15,504 |
Level 3 | Mortgage loan receivables held for sale |  |  |
Assets: |  |  |
Fair value of assets |  | 202,363 | 187,870
Level 3 | FHLB stock |  |  |
Assets: |  |  |
Fair value of assets |  | 61,619 | 57,915
Recurring |  |  |
Assets: |  |  |
Fair value of assets |  | 1,608,192 | 1,397,918
Recurring | Nonhedge derivatives |  |  |
Liabilities: |  |  |
Nonhedge derivative liabilities |  |  | 605,871
Fair value of liabilities |  |  | 975
Recurring | CMBS |  |  |
Assets: |  |  |
Outstanding Face Amount |  | 1,463,281 | 1,246,609
Fair value of assets |  | 1,469,978 | 1,241,334
Recurring | CMBS interest-only |  |  |
Assets: |  |  |
Outstanding Face Amount |  | 2,425,377 | 2,362,747
Fair value of assets |  | 52,664 | 54,789
Recurring | GNMA interest-only |  |  |
Assets: |  |  |
Outstanding Face Amount |  | 123,684 | 135,932
Fair value of assets |  | 2,491 | 2,648
Recurring | Agency securities |  |  |
Assets: |  |  |
Outstanding Face Amount |  | 660 | 668
Fair value of assets |  | 661 | 662
Recurring | GNMA permanent securities |  |  |
Assets: |  |  |
Outstanding Face Amount |  | 32,346 | 32,633
Fair value of assets |  | 33,006 | 33,064
Recurring | Corporate bonds |  |  |
Assets: |  |  |
Outstanding Face Amount |  | 36,441 | 55,305
Fair value of assets |  | 36,609 | 53,871
Recurring | Common Stock |  |  |
Assets: |  |  |
Fair value of assets |  | 11,151 | 11,550
Recurring | Nonhedge derivatives |  |  |
Assets: |  |  |
Fair value of assets |  | 1,632 |
Derivative Asset, Notional Amount |  | 454,571 |
Recurring | Level 1 |  |  |
Assets: |  |  |
Fair value of assets |  | 11,151 | 11,550
Recurring | Level 1 | Nonhedge derivatives |  |  |
Liabilities: |  |  |
Fair value of liabilities |  |  | 0
Recurring | Level 1 | CMBS |  |  |
Assets: |  |  |
Fair value of assets |  | 0 | 0
Recurring | Level 1 | CMBS interest-only |  |  |
Assets: |  |  |
Fair value of assets |  | 0 | 0
Recurring | Level 1 | GNMA interest-only |  |  |
Assets: |  |  |
Fair value of assets |  | 0 | 0
Recurring | Level 1 | Agency securities |  |  |
Assets: |  |  |
Fair value of assets |  | 0 | 0
Recurring | Level 1 | GNMA permanent securities |  |  |
Assets: |  |  |
Fair value of assets |  | 0 | 0
Recurring | Level 1 | Corporate bonds |  |  |
Assets: |  |  |
Fair value of assets |  | 0 | 0
Recurring | Level 1 | Common Stock |  |  |
Assets: |  |  |
Fair value of assets |  | 11,151 | 11,550
Recurring | Level 1 | Nonhedge derivatives |  |  |
Assets: |  |  |
Fair value of assets |  | 0 |
Recurring | Level 2 |  |  |
Assets: |  |  |
Fair value of assets |  | 1,632 | 0
Recurring | Level 2 | Nonhedge derivatives |  |  |
Liabilities: |  |  |
Fair value of liabilities |  |  | 975
Recurring | Level 2 | CMBS |  |  |
Assets: |  |  |
Fair value of assets |  | 0 | 0
Recurring | Level 2 | CMBS interest-only |  |  |
Assets: |  |  |
Fair value of assets |  | 0 | 0
Recurring | Level 2 | GNMA interest-only |  |  |
Assets: |  |  |
Fair value of assets |  | 0 | 0
Recurring | Level 2 | Agency securities |  |  |
Assets: |  |  |
Fair value of assets |  | 0 | 0
Recurring | Level 2 | GNMA permanent securities |  |  |
Assets: |  |  |
Fair value of assets |  | 0 | 0
Recurring | Level 2 | Corporate bonds |  |  |
Assets: |  |  |
Fair value of assets |  | 0 | 0
Recurring | Level 2 | Nonhedge derivatives |  |  |
Assets: |  |  |
Fair value of assets |  | 1,632 |
Recurring | Level 3 |  |  |
Assets: |  |  |
Fair value of assets |  | 1,595,409 | 1,386,368
Recurring | Level 3 | Nonhedge derivatives |  |  |
Liabilities: |  |  |
Fair value of liabilities |  |  | 0
Recurring | Level 3 | CMBS |  |  |
Assets: |  |  |
Fair value of assets |  | 1,469,978 | 1,241,334
Recurring | Level 3 | CMBS interest-only |  |  |
Assets: |  |  |
Fair value of assets |  | 52,664 | 54,789
Recurring | Level 3 | GNMA interest-only |  |  |
Assets: |  |  |
Fair value of assets |  | 2,491 | 2,648
Recurring | Level 3 | Agency securities |  |  |
Assets: |  |  |
Fair value of assets |  | 661 | 662
Recurring | Level 3 | GNMA permanent securities |  |  |
Assets: |  |  |
Fair value of assets |  | 33,006 | 33,064
Recurring | Level 3 | Corporate bonds |  |  |
Assets: |  |  |
Fair value of assets |  | 36,609 | $ 53,871
Recurring | Level 3 | Nonhedge derivatives |  |  |
Assets: |  |  |
Fair value of assets |  | $ 0 |
[1] | Includes amounts relating to consolidated variable interest entities. See Note 3.

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