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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
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]        
Loans held for sale, at fair value $ 716,024 $ 917,534 $ 500,814 $ 366,364
Variable Interest Entity, Primary Beneficiary        
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]        
Loans held for sale, at fair value 241,676 462,144    
Outstanding borrowings (Mortgage loan warehouse facilities) $ 280,271 $ 459,344