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Borrowings - Schedule of Second Lien Priority on Specified Assets Carried on Balance Sheet (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Debt Instrument [Line Items]      
Advances, net $ 642,461 $ 772,433  
Mortgage servicing rights (MSRs), at fair value 2,714,225 2,250,147  
Cash and cash equivalents 226,570 192,792  
Total assets 12,360,069 $ 12,147,123 $ 12,040,238
Second Lien      
Debt Instrument [Line Items]      
Advances, net 116,980    
Specified deferred servicing fee 21,591    
Mortgage servicing rights (MSRs), at fair value 796,556    
Cash and cash equivalents 146,849    
Specified advance facility reserves 10,064    
Specified loan value 84,754    
Specified residual value 79,513    
Total assets $ 1,256,305