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FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Quantitative Information (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	$ 1,930,430	$ 1,708,325
CMBS
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	1,868,149	1,644,322
CMBS interest-only
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	27,835	29,146
GNMA interest-only
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	1,607	1,851
Agency securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	628	637
GNMA permanent securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	$ 32,211	$ 32,369
Level 3 | CMBS | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Duration	3 days	0 years
Level 3 | CMBS | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Duration	2 years 7 months 6 days	1 year 7 months 17 days
Level 3 | CMBS | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Duration	6 years 3 months	6 years 10 months 13 days
Level 3 | CMBS interest-only | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Duration	1 month 20 days	7 days
Level 3 | CMBS interest-only | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Duration	2 years 3 months 18 days	2 years 5 months 19 days
Level 3 | CMBS interest-only | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Duration	3 years 4 months 2 days	3 years 6 months 3 days
Level 3 | GNMA interest-only | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Duration	6 months 7 days	25 days
Level 3 | GNMA interest-only | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Duration	2 years 6 months 25 days	2 years 10 months 24 days
Level 3 | GNMA interest-only | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Duration	13 years 8 months 12 days	13 years 8 months 8 days
Level 3 | Agency securities | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Duration	0 years	0 years
Level 3 | Agency securities | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Duration	2 years 1 month 28 days	2 years 3 months 18 days
Level 3 | Agency securities | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Duration	2 years 8 months 15 days	2 years 11 months 1 day
Level 3 | GNMA permanent securities | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Duration	1 year 1 month 24 days	2 years 7 months 6 days
Level 3 | GNMA permanent securities | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Duration	9 years 11 months 15 days	3 years 7 months 9 days
Level 3 | GNMA permanent securities | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Duration	14 years 10 months 20 days	6 years 5 months 26 days
Level 3 | Yield | CMBS | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.0168	0
Level 3 | Yield | CMBS | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.111	0.0311
Level 3 | Yield | CMBS | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	4.4278	0.1992
Level 3 | Yield | CMBS interest-only | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.0206	0.0157
Level 3 | Yield | CMBS interest-only | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.0404	0.0393
Level 3 | Yield | CMBS interest-only | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.068	0.0762
Level 3 | Yield | GNMA interest-only | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	(0.0232)	(0.0482)
Level 3 | Yield | GNMA interest-only | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.1081	0.1513
Level 3 | Yield | GNMA interest-only | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	1.2394	0.445
Level 3 | Yield | Agency securities | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.0142	0
Level 3 | Yield | Agency securities | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.1577	0.017
Level 3 | Yield | Agency securities | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.72	0.0216
Level 3 | Yield | GNMA permanent securities | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	1.5721	0.5656
Level 3 | Yield | GNMA permanent securities | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	2.7767	1.6679
Level 3 | Yield | GNMA permanent securities | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	4.1000	4.10
Level 3 | Prepayment speed | CMBS interest-only | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	100.00	100.00
Level 3 | Prepayment speed | CMBS interest-only | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	97.23	97.24
Level 3 | Prepayment speed | CMBS interest-only | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	100.00	100.00
Level 3 | Prepayment speed | GNMA interest-only | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	5.00	5.00
Level 3 | Prepayment speed | GNMA interest-only | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	12.36	12.36
Level 3 | Prepayment speed | GNMA interest-only | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	35.00	35.00
Level 3 | Internal Model Third Party Inputs Valuation Technique
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	$ 1,918,071	$ 1,695,913
Recurring | Internal Model Third Party Inputs Valuation Technique | CMBS
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.0221	0.0308
Duration	2 years 3 months 21 days	2 years 4 months 28 days
Recurring | Internal Model Third Party Inputs Valuation Technique | CMBS interest-only
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.0299	0.0304
Duration	2 years 5 months 15 days	2 years 6 months 10 days
Recurring | Internal Model Third Party Inputs Valuation Technique | GNMA interest-only
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.0486	0.0459
Duration	3 years 18 days	2 years 9 months 7 days
Recurring | Internal Model Third Party Inputs Valuation Technique | Agency securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.0170	0.0173
Duration	1 year 8 months 12 days	1 year 9 months 29 days
Recurring | Internal Model Third Party Inputs Valuation Technique | GNMA permanent securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement input	0.0350	0.0317
Duration	2 years 7 months 9 days	1 year 11 months 4 days
Recurring | Level 3 | Internal Model Third Party Inputs Valuation Technique | CMBS
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	$ 1,856,560	$ 1,632,714
Recurring | Level 3 | Internal Model Third Party Inputs Valuation Technique | CMBS interest-only
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	27,065	28,342
Recurring | Level 3 | Internal Model Third Party Inputs Valuation Technique | GNMA interest-only
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	1,607	1,851
Recurring | Level 3 | Internal Model Third Party Inputs Valuation Technique | Agency securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	628	637
Recurring | Level 3 | Internal Model Third Party Inputs Valuation Technique | GNMA permanent securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	$ 32,211	$ 32,369

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