Annual report pursuant to Section 13 and 15(d)

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

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MORTGAGE SERVICING RIGHTS AND MSR FINANCING RECEIVABLES - Summary of the Geographic Distribution of the Underlying Residential Mortgage Loans of the MSRs (Details) - MSRs - Mortgage Loans
Dec. 31, 2020
Dec. 31, 2019
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 21.20% 21.90%
Florida    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 7.40% 6.90%
New York    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 7.00% 6.40%
Texas    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 5.60% 5.50%
New Jersey    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 4.80% 4.90%
Illinois    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 3.60% 3.60%
Massachusetts    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 3.40% 3.40%
Georgia    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 3.30% 3.10%
Pennsylvania    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 3.10% 3.00%
Maryland    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 3.10% 3.00%
Other U.S.    
Schedule of MSRs [Line Items]    
Percentage of Total Outstanding Unpaid Principal Amount 37.50% 38.30%