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
12 Months Ended
Dec. 31, 2019
Jan. 01, 2020
Dec. 31, 2018
Cash and Cash Equivalents [Line Items]      
Restricted cash $ 162,197   $ 164,020
Debt instrument, term 1 year    
Increase in retained earnings due to adoption of new acocunting standard $ 549,733   830,713
Decrease in residential mortgage loans, due to adoption of new accounting guidance (4,613,612)   (2,808,529)
Ginnie Mae      
Cash and Cash Equivalents [Line Items]      
Restricted cash 4,700   4,100
MSRs      
Cash and Cash Equivalents [Line Items]      
Restricted cash 61,100   60,400
Secured Corporate Note      
Cash and Cash Equivalents [Line Items]      
Restricted cash 0   1,900
Servicer Advance Investments      
Cash and Cash Equivalents [Line Items]      
Restricted cash 64,000   60,000
Consumer Loan      
Cash and Cash Equivalents [Line Items]      
Restricted cash $ 32,400   $ 37,600
Forecast | Accounting Standards Update 2016-13      
Cash and Cash Equivalents [Line Items]      
Increase in retained earnings due to adoption of new acocunting standard   $ 5,900  
Decrease in residential mortgage loans, due to adoption of new accounting guidance   6,000  
Increase in consumer loans, at fair value due to adoption of new accounting guidance   $ 11,900