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Securitizations and Variable Interest Entities - Schedule of Carrying Value of Assets and Liabilities of Loans Held for Sale Financing Facility (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]            
Loans held for sale, at fair value $ 921,621 $ 680,866 $ 366,364 $ 366,966 $ 253,037 $ 208,752
Outstanding borrowings (Mortgage loan warehouse facilities) 7,493,475   7,349,433      
Secured Debt            
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]            
Outstanding borrowings (Mortgage loan warehouse facilities) 946,816   438,566      
Master Repurchase Agreement | Secured Debt            
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]            
Outstanding borrowings (Mortgage loan warehouse facilities) 465,018   0      
Variable Interest Entity, Primary Beneficiary            
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]            
Loans held for sale, at fair value $ 461,827   $ 0