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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Classification and Carrying Value of Unconsolidated VIEs (Details) - Equity Method Investment, Nonconsolidated Investee or Group of Investees - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Total Unconsolidated Variable Interest Entities
Variable Interest Entity [Line Items]
Investments	$ 230,216	$ 278,936
ABS
Variable Interest Entity [Line Items]
Investments		856
Non-Agency RMBS
Variable Interest Entity [Line Items]
Investments	24,462	29,290
Preferred equity investments in multi-family properties
Variable Interest Entity [Line Items]
Investments	200,034	239,780
Joint venture equity investments in multi-family properties
Variable Interest Entity [Line Items]
Investments	5,720	9,010
Multi-family loans | Total Unconsolidated Variable Interest Entities
Variable Interest Entity [Line Items]
Investments	95,792	87,534
Multi-family loans | ABS
Variable Interest Entity [Line Items]
Investments		0
Multi-family loans | Non-Agency RMBS
Variable Interest Entity [Line Items]
Investments	0	0
Multi-family loans | Preferred equity investments in multi-family properties
Variable Interest Entity [Line Items]
Investments	95,792	87,534
Multi-family loans | Joint venture equity investments in multi-family properties
Variable Interest Entity [Line Items]
Investments	0	0
Investment securities available for sale, at fair value | Total Unconsolidated Variable Interest Entities
Variable Interest Entity [Line Items]
Investments	24,462	30,146
Investment securities available for sale, at fair value | ABS
Variable Interest Entity [Line Items]
Investments		856
Investment securities available for sale, at fair value | Non-Agency RMBS
Variable Interest Entity [Line Items]
Investments	24,462	29,290
Investment securities available for sale, at fair value | Preferred equity investments in multi-family properties
Variable Interest Entity [Line Items]
Investments	0	0
Investment securities available for sale, at fair value | Joint venture equity investments in multi-family properties
Variable Interest Entity [Line Items]
Investments	0	0
Equity investments | Total Unconsolidated Variable Interest Entities
Variable Interest Entity [Line Items]
Investments	109,962	152,246
Equity investments | ABS
Variable Interest Entity [Line Items]
Investments		0
Equity investments | Non-Agency RMBS
Variable Interest Entity [Line Items]
Investments	0	0
Equity investments | Preferred equity investments in multi-family properties
Variable Interest Entity [Line Items]
Investments	104,242	152,246
Equity investments | Joint venture equity investments in multi-family properties
Variable Interest Entity [Line Items]
Investments	$ 5,720	0
Assets of disposal group held for sale | Total Unconsolidated Variable Interest Entities
Variable Interest Entity [Line Items]
Investments		9,010
Assets of disposal group held for sale | ABS
Variable Interest Entity [Line Items]
Investments		0
Assets of disposal group held for sale | Non-Agency RMBS
Variable Interest Entity [Line Items]
Investments		0
Assets of disposal group held for sale | Preferred equity investments in multi-family properties
Variable Interest Entity [Line Items]
Investments		0
Assets of disposal group held for sale | Joint venture equity investments in multi-family properties
Variable Interest Entity [Line Items]
Investments		$ 9,010

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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