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Borrowings - Schedule of Second Lien Priority on Specified Assets Carried on Balance Sheet (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Debt Instrument [Line Items]      
Advances $ 729,973 $ 772,433  
Mortgage servicing rights (MSRs), at fair value 2,323,281 2,250,147  
Cash and cash equivalents 268,691 192,792  
Total assets 12,297,809 $ 12,147,123 $ 10,771,788
Second Lien      
Debt Instrument [Line Items]      
Advances 157,311    
Deferred Servicing Income 23,081    
Mortgage servicing rights (MSRs), at fair value 731,436    
Cash and cash equivalents 155,785    
Advance facility reserve 6,574    
Specified Loan Value 68,526    
Specified Residual Value 40,200    
Total assets $ 1,182,912