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Fair Value of Financial Instruments - Changes in Unrealized Gains (Losses) Included in Earnings for Level 3 (Details) - Level 3 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Consolidated SLST | VIE, Primary Beneficiary
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Multi-family loans held in securitization trusts, at fair value	$ (31,128)	$ 33,479	$ 300
Change in unrealized gains (losses) – liabilities	54,960	(65,552)	(383)
Consolidated K-Series | VIE, Primary Beneficiary
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Multi-family loans held in securitization trusts, at fair value	0	0	586,993
Change in unrealized gains (losses) – liabilities	0	0	(563,031)
Distressed And Other Residential Mortgage Loans At Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Multi-family loans held in securitization trusts, at fair value	31,222	16,449	44,470
Residential loans held in securitization trusts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Multi-family loans held in securitization trusts, at fair value	35,570	17,785	0
Multi-family loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Multi-family loans held in securitization trusts, at fair value	1,924	(682)	0
Investments in unconsolidated entities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Multi-family loans held in securitization trusts, at fair value	$ 3,990	$ 256	$ 5,374

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- Definition

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 http://asc.fasb.org/extlink&oid=123874694&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.

+ References

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-Publisher FASB
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-Topic 820
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-Paragraph 2
-Subparagraph (d)
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