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Borrowings - Schedule of Second Lien Priority on Specified Assets Carried on Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Advances, net (amounts related to VIEs of $587,059 and $651,576) $ 772,433 $ 828,239  
Mortgage servicing rights, at fair value 2,250,147 1,294,817  
Cash and cash equivalents 192,792 284,802  
Balance 12,147,123 $ 10,651,127 $ 10,406,199
Second Lien      
Debt Instrument [Line Items]      
Advances, net (amounts related to VIEs of $587,059 and $651,576) 179,228    
Deferred Servicing Income 24,152    
Mortgage servicing rights, at fair value 730,720    
Cash and cash equivalents 65,468    
Advance Facility Reserve 7,687    
Specified Loan Value 101,953    
Specified Residual Value 40,763    
Balance $ 1,149,969