Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Accretion and Other Amortization (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Accretion and Other Amortization (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Accretion of net discount on securities and loans $ 96,148 $ 323,652 $ 452,500
Accretion of servicer advances receivable discount and servicer advance investments 55,664 28,094 214,876
Accretion of excess mortgage servicing rights income 28,352 32,647 44,440
Amortization of deferred financing costs (22,733) (4,019) (7,795)
Accretion and other amortization 151,540 379,129 701,967
Secured Notes And Bonds Payable      
Debt Instrument [Line Items]      
Amortization of debt (388) (1,245) (2,054)
Term Loan      
Debt Instrument [Line Items]      
Amortization of debt $ (5,503) $ 0 $ 0