Annual report pursuant to Section 13 and 15(d)

SERVICER ADVANCE INVESTMENTS - Summary of Investments in Servicer Advances - Additional Information (Details)

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SERVICER ADVANCE INVESTMENTS - Summary of Investments in Servicer Advances - Additional Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Investments in and Advances to Affiliates [Line Items]    
Outstanding Servicer Advances [1] $ 538,056 $ 581,777
Face amount of debt 25,219,365  
Corporate Joint Venture    
Investments in and Advances to Affiliates [Line Items]    
Outstanding Servicer Advances 449,150 462,843
Corporate Joint Venture | Servicer Advance Investments    
Investments in and Advances to Affiliates [Line Items]    
UPB of Underlying Mortgages 26,061,499 31,442,267
Outstanding Servicer Advances $ 449,150 $ 462,843
Servicer Advances to UPB of Underlying Residential Mortgage Loans 1.70% 1.50%
Face amount of debt $ 423,144 $ 443,248
Gross Loan-to-Value 88.40% 88.30%
Net Loan-to-Value 88.60% 87.20%
Gross Cost of Funds 1.50% 3.40%
Net Cost of Funds 1.30% 2.80%
[1] See Note 14 regarding consolidated variable interest entities.