Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS IN REAL ESTATE SECURITIES - Summary of the Geographic Distribution of the Collateral Securing Non-Agency RMBS (Details)

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INVESTMENTS IN REAL ESTATE SECURITIES - Summary of the Geographic Distribution of the Collateral Securing Non-Agency RMBS (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Non-Agency RMBS [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Outstanding Face Amount $ 11,669,855 $ 7,202,218
Percentage of Total Outstanding 100.00% 100.00%
Non-Agency RMBS [Member] | Western U.S. [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Outstanding Face Amount $ 4,496,161 $ 2,757,424
Percentage of Total Outstanding 38.50% 38.30%
Non-Agency RMBS [Member] | Southeastern U.S. [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Outstanding Face Amount $ 2,760,624 $ 1,635,596
Percentage of Total Outstanding 23.70% 22.70%
Non-Agency RMBS [Member] | Northeastern U.S. [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Outstanding Face Amount $ 2,295,432 $ 1,426,519
Percentage of Total Outstanding 19.70% 19.80%
Non-Agency RMBS [Member] | Midwestern U.S. [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Outstanding Face Amount $ 1,247,366 $ 778,372
Percentage of Total Outstanding 10.70% 10.80%
Non-Agency RMBS [Member] | Southwestern U.S. [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Outstanding Face Amount $ 845,200 $ 557,033
Percentage of Total Outstanding 7.20% 7.70%
Non-Agency RMBS [Member] | Other U.S. [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Outstanding Face Amount $ 25,072 $ 47,274
Percentage of Total Outstanding 0.20% 0.70%
Servicer Advances [Member] | Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Face amount of investment $ 100,000 $ 100,000
Consumer Loan [Member] | Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Face amount of investment   $ 137,500