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Securitizations and Variable Interest Entities - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Average period to securitization 30 days    
MSRs retained $ 34,260 $ 6,561  
Percentage of loan transferred through securitization 60 days or more past due 5.50%   6.80%
Ginnie Mae Loans      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Percentage of loan transferred through securitization 60 days or more past due 15.20%   17.10%