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Securitizations and Variable Interest Entities - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Average period to securitization 30 days    
MSRs retained $ 45,803 $ 34,260  
Percentage of loan transferred through securitization 60 days or more past due 3.00%   3.60%
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 10.70%   12.00%