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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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