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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		Mar. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Assets	[1]	$ 4,726,174	$ 4,655,587
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Maximum exposure		460,443	465,913
Multi-family loans | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Maximum exposure		151,836	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		48,542	43,225
Equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Maximum exposure		260,065	259,095
ABS | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets		44,622	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		44,622	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		3,920
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		3,920
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		332,528	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		146,693	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		185,835	182,765
Mezzanine loans on multi-family properties | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Variable Interest Entity [Line Items]
Assets		5,143	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		5,143	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	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	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		74,230	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		$ 74,230	$ 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 March 31, 2021 and December 31, 2020, assets of consolidated VIEs totaled $2,011,594 and $2,150,984, respectively, and the liabilities of consolidated VIEs totaled $1,593,419 and $1,667,306, respectively. See Note 7 for further discussion.

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