Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Cash and Cash Equivalents [Line Items]    
Restricted cash $ 135,619 $ 162,197
Increase in retained earnings due to adoption of new acocunting standard (1,108,929) 549,733
Cumulative Effect, Period of Adoption, Adjustment    
Cash and Cash Equivalents [Line Items]    
Increase in retained earnings due to adoption of new acocunting standard   13,700
Increase in consumer loans, at fair value due to adoption of new accounting guidance   (19,700)
Decrease in residential mortgage loans, due to adoption of new accounting guidance   6,000
Government Guaranteed Mortgage Loans upon Foreclosure Receivable    
Cash and Cash Equivalents [Line Items]    
Claims receivable 16,200  
Ginnie Mae    
Cash and Cash Equivalents [Line Items]    
Restricted cash 4,700 4,700
MSRs    
Cash and Cash Equivalents [Line Items]    
Restricted cash 51,900 61,100
Real Estate Securities    
Cash and Cash Equivalents [Line Items]    
Restricted cash 15,700 0
Single Family Rental Properties    
Cash and Cash Equivalents [Line Items]    
Restricted cash 100 0
Servicer Advance Investments    
Cash and Cash Equivalents [Line Items]    
Restricted cash 36,300 64,000
Consumer Loan    
Cash and Cash Equivalents [Line Items]    
Restricted cash 27,000 $ 32,400
Residential Mortgage Loans    
Cash and Cash Equivalents [Line Items]    
Unpaid principal balance $ 290,900