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Multi-family Loans, at Fair Value - Preferred Equity and Mezzanine Loan Investments (Details) - Preferred Equity and Mezzanine Loan Investments - VIE, Not Primary Beneficiary - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Investment amount	$ 95,640	$ 88,249
Deferred loan fees, net	(497)	(428)
Unrealized gains (losses), net	166	(287)
Total, at Fair Value	$ 95,309	$ 87,534

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Amount of investments classified as other.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(12))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: 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 https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

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