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REAL ESTATE SECURITIES - Securities by Remaining Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Within 1 year $ 396,616 $ 343,834
1-5 years 1,319,861 884,997
5-10 years 181,522 169,743
After 10 years 0 2
Total 1,897,999 1,398,576
CMBS    
Debt Securities, Available-for-sale [Line Items]    
Within 1 year 395,377 342,121
1-5 years 1,212,074 772,594
5-10 years 181,261 137,925
After 10 years 0 0
Total 1,788,712 1,252,640
CMBS interest-only    
Debt Securities, Available-for-sale [Line Items]    
Within 1 year 645 1,145
1-5 years 40,795 54,546
5-10 years 0 0
After 10 years 0 0
Total 41,440 55,691
GNMA interest-only    
Debt Securities, Available-for-sale [Line Items]    
Within 1 year 250 17
1-5 years 1,515 2,276
5-10 years 261 353
After 10 years 0 2
Total 2,026 2,648
Agency securities    
Debt Securities, Available-for-sale [Line Items]    
Within 1 year 0 0
1-5 years 654 662
5-10 years 0 0
After 10 years 0 0
Total 654 662
GNMA permanent securities    
Debt Securities, Available-for-sale [Line Items]    
Within 1 year 344 551
1-5 years 32,451 1,048
5-10 years 0 31,465
After 10 years 0 0
Total 32,795 33,064
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Within 1 year 0 0
1-5 years 32,372 53,871
5-10 years 0 0
After 10 years 0 0
Total $ 32,372 $ 53,871