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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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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
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