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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, 2020	Dec. 31, 2019	Dec. 31, 2018
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	$ 33,479	$ 300	$ 0
Change in unrealized gains (losses) – liabilities	(65,552)	(383)	0
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	586,993	(85,115)
Change in unrealized gains (losses) – liabilities	0	(563,031)	122,696
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	16,449	44,470	4,333
Residential Mortgage Loans Held In Securitization Trust, 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	17,785	0	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	256	5,374	6,091
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	$ (682)	$ 0	$ 0

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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=117815213&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
-Name Accounting Standards Codification
-Topic 820
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-Section 50
-Paragraph 2
-Subparagraph (d)
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