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REAL ESTATE SECURITIES - Securities by Remaining Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Within 1 year	$ 363,039	$ 343,834
1-5 years	1,021,189	884,997
5-10 years	223,748	169,743
After 10 years	1	2
Total	1,607,977	1,398,576
CMBS
Debt Securities, Available-for-sale [Line Items]
Within 1 year	361,036	342,121
1-5 years	922,789	772,594
5-10 years	197,815	137,925
After 10 years	0	0
Total	1,481,640	1,252,640
CMBS interest-only
Debt Securities, Available-for-sale [Line Items]
Within 1 year	1,191	1,145
1-5 years	52,379	54,546
5-10 years	0	0
After 10 years	0	0
Total	53,570	55,691
GNMA interest-only
Debt Securities, Available-for-sale [Line Items]
Within 1 year	329	17
1-5 years	1,929	2,276
5-10 years	232	353
After 10 years	1	2
Total	2,491	2,648
Agency securities
Debt Securities, Available-for-sale [Line Items]
Within 1 year	0	0
1-5 years	661	662
5-10 years	0	0
After 10 years	0	0
Total	661	662
GNMA permanent securities
Debt Securities, Available-for-sale [Line Items]
Within 1 year	483	551
1-5 years	6,822	1,048
5-10 years	25,701	31,465
After 10 years	0	0
Total	33,006	33,064
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Within 1 year	0	0
1-5 years	36,609	53,871
5-10 years	0	0
After 10 years	0	0
Total	$ 36,609	$ 53,871

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
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-Subparagraph (b)
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