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Multi-family Loans, at Fair Value - Preferred Equity and Mezzanine Loan Investments (Details) - Preferred Equity and Mezzanine Loan Investments - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Investment amount	$ 118,517	$ 163,392
Deferred loan fees, net	(763)	(1,169)
Unrealized gains, net	2,058	1,370
Total	$ 119,812	$ 163,593

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Financial Instrument Owned, Deferred Loan Fees

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Preferred Equity and Mezzanine Loans, Accumulated Gross Unrealized Gain(loss), before Tax

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of investments classified as other.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(f,g))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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