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FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Quantitative Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Carrying Value | $ 1,607,977 | $ 1,398,576
CMBS |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Carrying Value | 1,481,640 | 1,252,640
CMBS interest-only |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Carrying Value | 53,570 | 55,691
GNMA interest-only |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Carrying Value | 2,491 | 2,648
Agency securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Carrying Value | 661 | 662
GNMA permanent securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Carrying Value | 33,006 | 33,064
Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Carrying Value | 36,609 | $ 53,871
Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Carrying Value | 1,607,977 |
Level 3 | CMBS |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Carrying Value | $ 1,481,640 |
Level 3 | CMBS | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Duration (in years) | 0 years | 0 years
Level 3 | CMBS | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Duration (in years) | 2 years 1 month 27 days | 2 years 6 months
Level 3 | CMBS | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Duration (in years) | 8 years 18 days | 7 years 9 months 10 days
Level 3 | CMBS interest-only |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Carrying Value | $ 53,570 |
Level 3 | CMBS interest-only | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Duration (in years) | 1 month 6 days | 1 month 20 days
Level 3 | CMBS interest-only | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Duration (in years) | 2 years 10 months 17 days | 2 years 11 months 15 days
Level 3 | CMBS interest-only | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Duration (in years) | 6 years 8 months 1 day | 6 years 10 months 9 days
Level 3 | GNMA interest-only |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Carrying Value | $ 2,491 |
Level 3 | GNMA interest-only | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Duration (in years) | 14 days | 14 days
Level 3 | GNMA interest-only | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Duration (in years) | 3 years 25 days | 3 years 1 month 17 days
Level 3 | GNMA interest-only | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Duration (in years) | 5 years 21 days | 4 years 9 months 7 days
Level 3 | Agency securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Carrying Value | $ 661 |
Level 3 | Agency securities | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Duration (in years) | 0 years | 0 years
Level 3 | Agency securities | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Duration (in years) | 2 years 8 months 15 days | 2 years 9 months 29 days
Level 3 | Agency securities | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Duration (in years) | 3 years 7 months 9 days | 3 years 9 months 25 days
Level 3 | GNMA permanent securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Carrying Value | $ 33,006 |
Level 3 | GNMA permanent securities | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Duration (in years) | 0 years | 0 years
Level 3 | GNMA permanent securities | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Duration (in years) | 5 years 5 months 15 days | 5 years 7 months 13 days
Level 3 | GNMA permanent securities | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Duration (in years) | 5 years 8 months 4 days | 5 years 10 months 17 days
Level 3 | Corporate bonds |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Carrying Value | $ 36,609 |
Level 3 | Corporate bonds | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Duration (in years) | 1 year 6 months 7 days | 1 year 11 months 8 days
Level 3 | Corporate bonds | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Duration (in years) | 1 year 7 months 13 days | 2 years 2 months 8 days
Level 3 | Corporate bonds | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Duration (in years) | 2 years 3 months 7 days | 2 years 8 months 12 days
Level 3 | Yield | CMBS | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.00 | 0.00
Level 3 | Yield | CMBS | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.0338 | 0.0354
Level 3 | Yield | CMBS | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.2132 | 0.2167
Level 3 | Yield | CMBS interest-only | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.0062 | 0.0087
Level 3 | Yield | CMBS interest-only | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.0461 | 0.0471
Level 3 | Yield | CMBS interest-only | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.0787 | 0.0811
Level 3 | Yield | GNMA interest-only | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.0211 | 0.0121
Level 3 | Yield | GNMA interest-only | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.0830 | 0.0554
Level 3 | Yield | GNMA interest-only | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.1013 | 0.1021
Level 3 | Yield | Agency securities | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.00 | 0.00
Level 3 | Yield | Agency securities | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.0189 | 0.021
Level 3 | Yield | Agency securities | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.0251 | 0.0284
Level 3 | Yield | GNMA permanent securities | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.0000 | 0.00
Level 3 | Yield | GNMA permanent securities | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.0338 | 0.0351
Level 3 | Yield | GNMA permanent securities | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.0392 | 0.04
Level 3 | Yield | Corporate bonds | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.0354 | 0.053
Level 3 | Yield | Corporate bonds | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.0358 | 0.0535
Level 3 | Yield | Corporate bonds | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, available-for-sale, measurement input | 0.0382 | 0.0546
Level 3 | Prepayment speed | CMBS interest-only | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, available-for-sale, measurement input | 100 | 100
Level 3 | Prepayment speed | CMBS interest-only | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, available-for-sale, measurement input | 100 | 100
Level 3 | Prepayment speed | CMBS interest-only | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, available-for-sale, measurement input | 100 | 100
Level 3 | Prepayment speed | GNMA interest-only | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, available-for-sale, measurement input | 5.00 | 5.00
Level 3 | Prepayment speed | GNMA interest-only | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, available-for-sale, measurement input | 6.64 | 6.58
Level 3 | Prepayment speed | GNMA interest-only | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt securities, available-for-sale, measurement input | 15.00 | 15.00
Internal Model Third Party Inputs Valuation Technique | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Carrying Value |  | $ 1,398,576

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