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Borrowings - Schedule of Second Lien Priority on Specified Assets Carried on Balance Sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Debt Instrument [Line Items]      
Advances, net $ 647,167 $ 772,433  
Mortgage servicing rights (MSRs), at fair value 2,485,679 2,250,147  
Cash and cash equivalents 255,885 192,792  
Total assets 12,107,690 $ 12,147,123 $ 11,767,710
Second Lien      
Debt Instrument [Line Items]      
Advances, net 116,635    
Specified deferred servicing fee 22,260    
Mortgage servicing rights (MSRs), at fair value 683,270    
Cash and cash equivalents 96,686    
Specified advance facility reserves 6,931    
Specified loan value 99,034    
Specified residual value 67,464    
Specified fair value of marketable securities 0    
Total assets $ 1,092,279