Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS - Geographic Distribution of the Underlying Residential Mortgage Loans (Details)

v3.10.0.1
INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS - Geographic Distribution of the Underlying Residential Mortgage Loans (Details) - Residential Mortgage Loans
Jun. 30, 2018
Dec. 31, 2017
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 100.00% 100.00%
California    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 13.00% 9.10%
New York    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 11.90% 12.80%
Texas    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 6.90% 6.60%
Florida    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 6.50% 8.20%
New Jersey    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 5.10% 5.20%
Pennsylvania    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 3.60% 3.40%
Illinois    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 3.50% 3.90%
Massachusetts    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 2.80% 2.70%
Maryland    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 2.60% 2.70%
Washington    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 2.00% 1.70%
Other U.S.    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 42.10% 43.70%