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Fair Value of Financial Instruments - Changes in Unrealized Gains (Losses) Included in Earnings for Level 3 Assets and Liabilities (Details) - Level 3 - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Collateralized Debt Obligations | Consolidated SLST | VIE, Primary Beneficiary
Liabilities
Unrealized gains (losses)	$ 6,523	$ 3,322	$ 57,889	$ 37,890
Residential loans | Consolidated SLST | VIE, Primary Beneficiary
Assets
Unrealized gains (losses)	(10,798)	6,471	(77,443)	(18,872)
Residential loans | Residential loans
Assets
Unrealized gains (losses)	(29,826)	3,752	(55,058)	12,192
Residential loans | Residential Loans Held in Securitization Trusts
Assets
Unrealized gains (losses)	(33,262)	6,030	(64,729)	18,611
Multi-family loans | Preferred Equity and Mezzanine Loan Investments
Assets
Unrealized gains (losses)	181	460	358	665
Multi-family loans | Equity investments
Assets
Unrealized gains (losses)	$ 3,139	$ 805	$ 3,593	$ 927

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Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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Amount of unrealized gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
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