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SERVICING RIGHTS, AT FAIR VALUE - Unpaid Principal of Servicing 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
Percentage of servicing portfolio in forbearance resulting from COVID-19 1.10% 2.40%
Current loans    
Servicing Assets at Fair Value [Line Items]    
Total portfolio $ 143,345,702 $ 100,358,713
Loans 30 - 89 days delinquent    
Servicing Assets at Fair Value [Line Items]    
Total portfolio 455,284 709,946
Loans 90 or more days delinquent or in foreclosure    
Servicing Assets at Fair Value [Line Items]    
Total portfolio $ 1,504,196 $ 1,862,599