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Securitizations and Variable Interest Entities - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]          
Average period to securitization     30 days    
MSRs retained $ 35,802 $ 9,128 $ 70,062 $ 15,689  
Percentage of loan transferred through securitization 60 days or more past due     5.40%   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     15.10%   17.10%