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Principles of Consolidation - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) partnership entity	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)
Variable Interest Entity [Line Items]
Number of partnerships consolidated | partnership	2
VIE, ownership interest rate	80.00%
MSRs	$ 192,852	$ 217,656
Gain related to called security	$ 2,000
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Number of partnerships consolidated | partnership	2
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Number of securitization entities to which asset transferred (in entities) | entity	54
Unpaid principal balance of loans purchased	$ 19,000
Loans, held-for-sale	19,000
Legacy Sequoia | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Estimated fair value of investments	4,000
Sequoia Choice | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Estimated fair value of investments	224,000
CAFL | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Estimated fair value of investments	264,000
Freddie Mac SLST | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Estimated fair value of investments	433,000
ABS issued, net, Amortized cost			$ 210,000
Freddie Mac K-Series | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Estimated fair value of investments	29,000
Servicing Investment | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
MSRs	$ 65,000

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