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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		Jun. 30, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Assets	[1]	$ 4,780,927	$ 4,655,587
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Maximum exposure		377,065	465,913
Multi-family loans | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Maximum exposure		126,719	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		45,649	43,225
Equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Maximum exposure		204,697	259,095
ABS | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets		42,620	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		42,620	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		3,029
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		3,029
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		316,465	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		126,719	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		189,746	182,765
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		14,951	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		$ 14,951	$ 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 June 30, 2021 and December 31, 2020, assets of consolidated VIEs totaled $2,212,001 and $2,150,984, respectively, and the liabilities of consolidated VIEs totaled $1,744,689 and $1,667,306, respectively. See Note 7 for further discussion.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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