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Principles of Consolidation - Additional Information (Details) $ in Thousands		3 Months Ended	12 Months Ended	90 Months Ended
	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($) partnership	Dec. 31, 2018 USD ($) partnership	Jun. 30, 2019 USD ($) entity
Variable Interest Entity [Line Items]
Number of partnerships consolidated | partnership		2	2
MSRs	$ 236,632	$ 286,778	$ 286,778	$ 236,632
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
VIE, ownership interest rate	80.00%
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Number of securitization entities to which asset transferred (in entities) | entity				44
Gain (loss) on securitization of financial assets				$ 4,000
Loan acquisition, aggregate amount acquired				39,000
Legacy Sequoia | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Estimated fair value of investments	$ 11,000			11,000
Sequoia Choice | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Estimated fair value of investments	220,000			220,000
Freddie Mac SLST | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Estimated fair value of investments	244,000			244,000
Freddie Mac K-Series | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Estimated fair value of investments	207,000			207,000
Servicing Investment | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
MSRs	$ 67,000			$ 67,000

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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