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REAL ESTATE SECURITIES - Securities by Remaining Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Within 1 year $ 179,139 $ 343,834
1-5 years 1,451,193 884,997
5-10 years 77,993 169,743
After 10 years 0 2
Total 1,708,325 1,398,576
CMBS    
Debt Securities, Available-for-sale [Line Items]    
Within 1 year 177,193 342,121
1-5 years 1,389,392 772,594
5-10 years 77,737 137,925
After 10 years 0 0
Total 1,644,322 1,252,640
CMBS interest-only    
Debt Securities, Available-for-sale [Line Items]    
Within 1 year 1,439 1,145
1-5 years 27,707 54,546
5-10 years 0 0
After 10 years 0 0
Total 29,146 55,691
GNMA interest-only    
Debt Securities, Available-for-sale [Line Items]    
Within 1 year 91 17
1-5 years 1,504 2,276
5-10 years 256 353
After 10 years 0 2
Total 1,851 2,648
Agency securities    
Debt Securities, Available-for-sale [Line Items]    
Within 1 year 0 0
1-5 years 637 662
5-10 years 0 0
After 10 years 0 0
Total 637 662
GNMA permanent securities    
Debt Securities, Available-for-sale [Line Items]    
Within 1 year 416 551
1-5 years 31,953 1,048
5-10 years 0 31,465
After 10 years 0 0
Total $ 32,369 33,064
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Within 1 year   0
1-5 years   53,871
5-10 years   0
After 10 years   0
Total   $ 53,871