Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS IN MORTGAGE SERVICING RIGHTS AND MORTGAGE SERVICING RIGHTS FINANCING RECEIVABLES - Summary of the Geographic Distribution of the Underlying Residential Mortgage Loans (Details)

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INVESTMENTS IN MORTGAGE SERVICING RIGHTS AND MORTGAGE SERVICING RIGHTS FINANCING RECEIVABLES - Summary of the Geographic Distribution of the Underlying Residential Mortgage Loans (Details) - MSRs - Mortgage Loans
Mar. 31, 2019
Dec. 31, 2018
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 100.00% 100.00%
California    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 21.70% 21.70%
New York    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 7.50% 7.80%
Florida    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 6.70% 6.90%
Texas    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 5.20% 5.30%
New Jersey    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 4.80% 5.00%
Illinois    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 3.70% 3.70%
Massachusetts    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 3.50% 2.30%
Massachusetts    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 3.50% 3.50%
Maryland    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 3.30% 3.40%
Pennsylvania    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 3.00% 3.10%
Other U.S.    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 37.10% 37.30%