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Principles of Consolidation - Additional Information (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2021 USD ($) entity	Jun. 30, 2021 USD ($) partnership entity	Dec. 31, 2020 USD ($)
Variable Interest Entity [Line Items]
Number of partnerships consolidated | partnership		2
VIE, ownership interest rate		80.00%
MSRs	$ 171,818	$ 171,818	$ 217,656
Loans for sale at fair value that were acquired	$ 97,000	$ 97,000
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	52	52
Number of entities called | entity	3	4
Unpaid principal balance of loans purchased	$ 83,000	$ 101,000
Gain related to called security	7,000	9,000
Legacy Sequoia | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Estimated fair value of investments	4,000	4,000
Sequoia | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Estimated fair value of investments	234,000	234,000
CAFL
Variable Interest Entity [Line Items]
Loans transferred to held-for-sale	45,000
CAFL | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Estimated fair value of investments	272,000	272,000
Freddie Mac SLST | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Estimated fair value of investments	452,000	452,000
Freddie Mac K-Series | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Estimated fair value of investments	31,000	31,000
Servicing Investment | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
MSRs	$ 62,000	$ 62,000

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