Annual report pursuant to Section 13 and 15(d)

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

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INVESTMENTS IN REAL ESTATE AND OTHER SECURITIES - Summary of the Geographic Distribution of the Collateral Securing Non-Agency RMBS (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Non-Agency    
Debt Securities, Available-for-sale [Line Items]    
Outstanding Face Amount $ 24,747,959 $ 19,397,604
Percentage of Total Outstanding 100.00% 100.00%
Non-Agency | Western U.S.    
Debt Securities, Available-for-sale [Line Items]    
Outstanding Face Amount $ 9,048,847 $ 7,318,616
Percentage of Total Outstanding 36.60% 37.70%
Non-Agency | Southeastern U.S.    
Debt Securities, Available-for-sale [Line Items]    
Outstanding Face Amount $ 5,983,966 $ 4,613,314
Percentage of Total Outstanding 24.20% 23.80%
Non-Agency | Northeastern U.S.    
Debt Securities, Available-for-sale [Line Items]    
Outstanding Face Amount $ 5,416,137 $ 3,829,725
Percentage of Total Outstanding 21.90% 19.70%
Non-Agency | Midwestern U.S.    
Debt Securities, Available-for-sale [Line Items]    
Outstanding Face Amount $ 2,562,269 $ 2,063,263
Percentage of Total Outstanding 10.40% 10.60%
Non-Agency | Southwestern U.S.    
Debt Securities, Available-for-sale [Line Items]    
Outstanding Face Amount $ 1,440,467 $ 1,321,853
Percentage of Total Outstanding 5.80% 6.80%
Non-Agency | Other U.S.    
Debt Securities, Available-for-sale [Line Items]    
Outstanding Face Amount $ 296,273 $ 250,833
Percentage of Total Outstanding 1.10% 1.40%
Consumer loan bonds | Bonds    
Debt Securities, Available-for-sale [Line Items]    
Face Amount $ 25,000 $ 56,800
Corporate bond | Bonds    
Debt Securities, Available-for-sale [Line Items]    
Face Amount $ 85,000 $ 85,000