Quarterly report pursuant to Section 13 or 15(d)

MORTGAGE SERVICING RIGHTS AND MSR FINANCING RECEIVABLES - Schedule of Servicing Fee Revenue (Details)

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MORTGAGE SERVICING RIGHTS AND MSR FINANCING RECEIVABLES - Schedule of Servicing Fee Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Servicing Asset at Amortized Cost [Line Items]        
Gain (loss) on settlement of derivative instruments $ (73,978) $ (23,192) $ (152,913) $ (133,099)
Servicing revenue, net 203,022 35,520 747,099 (341,336)
Change in valuation inputs and assumptions     573,556  
Excess Spread Financing        
Servicing Asset at Amortized Cost [Line Items]        
Realization of cash flows (1,300) (2,400) (3,900) (6,100)
Change in valuation inputs and assumptions 1,300 (200) (300) 6,200
MSRs        
Servicing Asset at Amortized Cost [Line Items]        
Servicing fee revenue, net and interest income from MSRs and MSR financing receivables 384,953 404,373 1,069,544 1,249,504
Ancillary and other fees 13,692 46,486 98,887 140,538
Servicing fee revenue and fees 398,645 450,859 1,168,431 1,390,042
Realization of cash flows (287,318) (509,624) (924,766) (1,135,515)
Change in valuation inputs and assumptions 147,233 97,832 573,213 (598,226)
Change in fair value of derivative instruments (41,365) 0 (41,564) 0
(Gain) loss realized (739) (3,547) (17,088) 2,363
Gain (loss) on settlement of derivative instruments (13,434) 0 (11,127) 0
Servicing revenue, net $ 203,022 $ 35,520 $ 747,099 $ (341,336)