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REAL ESTATE SECURITIES - Securities by Remaining Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Within 1 year $ 332,204 $ 286,595
1-5 years 557,494 663,243
5-10 years 214,596 156,668
After 10 years 2,064 11
Total 1,106,358 1,106,517
CMBS    
Debt Securities, Available-for-sale [Line Items]    
Within 1 year 330,768 285,982
1-5 years 479,270 544,278
5-10 years 182,201 123,239
After 10 years 2,058 0
Total 994,297 953,499
CMBS interest-only    
Debt Securities, Available-for-sale [Line Items]    
Within 1 year 1,378 537
1-5 years 73,168 112,534
5-10 years 0 0
After 10 years 0 0
Total 74,546 113,071
GNMA interest-only    
Debt Securities, Available-for-sale [Line Items]    
Within 1 year 58 76
1-5 years 2,738 3,906
5-10 years 394 484
After 10 years 6 11
Total 3,196 4,477
Agency securities    
Debt Securities, Available-for-sale [Line Items]    
Within 1 year 0 0
1-5 years 686 728
5-10 years 0 0
After 10 years 0 0
Total 686 728
GNMA permanent securities    
Debt Securities, Available-for-sale [Line Items]    
Within 1 year 0 0
1-5 years 1,632 1,797
5-10 years 32,001 32,945
After 10 years 0 0
Total $ 33,633 $ 34,742