Quarterly report pursuant to Section 13 or 15(d)

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

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MORTGAGE SERVICING RIGHTS AND MSR FINANCING RECEIVABLES - Summary of the Geographic Distribution of the Underlying Residential Mortgage Loans (Details) - MSRs - Mortgage Loans
Sep. 30, 2021
Dec. 31, 2020
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 18.40% 21.20%
Florida    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 8.50% 7.40%
Texas    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 6.10% 5.60%
New York    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 6.10% 7.00%
Washington    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 5.40% 2.90%
New Jersey    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 4.60% 4.80%
Illinois    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 3.40% 3.60%
Virginia    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 3.40% 2.90%
Maryland    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 3.30% 3.10%
Colorado    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 3.00% 2.80%
Other U.S.    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 37.80% 38.70%