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SERVICING RIGHTS, AT FAIR VALUE - Components of Service Portfolio (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Servicing Assets at Fair Value [Line Items]    
Total portfolio $ 145,305,182 $ 102,931,258
Conventional    
Servicing Assets at Fair Value [Line Items]    
Total portfolio 112,166,336 74,459,448
Government    
Servicing Assets at Fair Value [Line Items]    
Total portfolio $ 33,138,846 $ 28,471,810