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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Classification and Carrying Value of Unconsolidated VIEs (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Assets	[1]	$ 4,912,809	$ 4,655,587
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Maximum exposure		448,019	465,913
Multi-family loans | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Maximum exposure		119,812	163,593
Investment securities available for sale, at fair value | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Maximum exposure		73,193	43,225
Equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Maximum exposure		255,014	259,095
ABS | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets		41,485	43,225
ABS | Multi-family loans | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets		0	0
ABS | Investment securities available for sale, at fair value | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets		41,485	43,225
ABS | Equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets		0	0
Non-Agency RMBS | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets		31,708
Non-Agency RMBS | Multi-family loans | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets		0
Non-Agency RMBS | Investment securities available for sale, at fair value | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets		31,708
Non-Agency RMBS | Equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets		0
Preferred equity investments in multi-family properties | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets		347,447	341,266
Preferred equity investments in multi-family properties | Multi-family loans | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets		119,812	158,501
Preferred equity investments in multi-family properties | Investment securities available for sale, at fair value | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets		0	0
Preferred equity investments in multi-family properties | Equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets		227,635	182,765
Joint venture equity investments in multi-family properties | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets		10,290
Joint venture equity investments in multi-family properties | Multi-family loans | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets		0
Joint venture equity investments in multi-family properties | Investment securities available for sale, at fair value | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets		0
Joint venture equity investments in multi-family properties | Equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets		10,290
Mezzanine loans on multi-family properties | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets			5,092
Mezzanine loans on multi-family properties | Multi-family loans | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets			5,092
Mezzanine loans on multi-family properties | Investment securities available for sale, at fair value | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets			0
Mezzanine loans on multi-family properties | Equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets			0
Equity investments in entities that invest in residential properties and loans | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets		17,089	76,330
Equity investments in entities that invest in residential properties and loans | Multi-family loans | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets		0	0
Equity investments in entities that invest in residential properties and loans | Investment securities available for sale, at fair value | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets		0	0
Equity investments in entities that invest in residential properties and loans | Equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets		$ 17,089	$ 76,330
[1] Our condensed consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs") as the Company is the primary beneficiary of these VIEs. As of September 30, 2021 and December 31, 2020, assets of consolidated VIEs totaled $2,217,348 and $2,150,984, respectively, and the liabilities of consolidated VIEs totaled $1,793,066 and $1,667,306, respectively. See Note 7 for further discussion.

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