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Securitizations and Variable Interest Entities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Average period to securitization			30 days
MSRs retained	$ 66,420	$ 22,096	$ 136,482	$ 37,785
Percentage of loan transferred through securitization 60 days or more past due			4.30%		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			13.10%		17.10%