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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Classification and Carrying Value of Unconsolidated VIEs (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Total assets	$ 400,914	$ 269,753
ABS
Variable Interest Entity [Line Items]
Total assets	49,214
Preferred equity investments in multi-family properties
Variable Interest Entity [Line Items]
Total assets	279,908	195,101
Mezzanine loans on multi-family properties
Variable Interest Entity [Line Items]
Total assets	6,220	10,926
Equity investments in entities that invest in residential properties and loans
Variable Interest Entity [Line Items]
Total assets	65,572	10,954
Mulit Family CMBS
Variable Interest Entity [Line Items]
Total assets		52,772
Investment securities available for sale, at fair value
Variable Interest Entity [Line Items]
Total assets	49,214	52,700
Investment securities available for sale, at fair value | ABS
Variable Interest Entity [Line Items]
Total assets	49,214
Investment securities available for sale, at fair value | Preferred equity investments in multi-family properties
Variable Interest Entity [Line Items]
Total assets	0	0
Investment securities available for sale, at fair value | Mezzanine loans on multi-family properties
Variable Interest Entity [Line Items]
Total assets	0	0
Investment securities available for sale, at fair value | Equity investments in entities that invest in residential properties and loans
Variable Interest Entity [Line Items]
Total assets	0	0
Investment securities available for sale, at fair value | Mulit Family CMBS
Variable Interest Entity [Line Items]
Total assets		52,700
Receivables and other assets
Variable Interest Entity [Line Items]
Total assets		72
Receivables and other assets | Preferred equity investments in multi-family properties
Variable Interest Entity [Line Items]
Total assets		0
Receivables and other assets | Mezzanine loans on multi-family properties
Variable Interest Entity [Line Items]
Total assets		0
Receivables and other assets | Equity investments in entities that invest in residential properties and loans
Variable Interest Entity [Line Items]
Total assets		0
Receivables and other assets | Mulit Family CMBS
Variable Interest Entity [Line Items]
Total assets		72
Preferred equity and mezzanine loan investments
Variable Interest Entity [Line Items]
Total assets	180,045	165,555
Preferred equity and mezzanine loan investments | ABS
Variable Interest Entity [Line Items]
Total assets	0
Preferred equity and mezzanine loan investments | Preferred equity investments in multi-family properties
Variable Interest Entity [Line Items]
Total assets	173,825	154,629
Preferred equity and mezzanine loan investments | Mezzanine loans on multi-family properties
Variable Interest Entity [Line Items]
Total assets	6,220	10,926
Preferred equity and mezzanine loan investments | Equity investments in entities that invest in residential properties and loans
Variable Interest Entity [Line Items]
Total assets	0	0
Preferred equity and mezzanine loan investments | Mulit Family CMBS
Variable Interest Entity [Line Items]
Total assets		0
Investments in unconsolidated entities
Variable Interest Entity [Line Items]
Total assets	171,655	51,426
Investments in unconsolidated entities | ABS
Variable Interest Entity [Line Items]
Total assets	0
Investments in unconsolidated entities | Preferred equity investments in multi-family properties
Variable Interest Entity [Line Items]
Total assets	106,083	40,472
Investments in unconsolidated entities | Mezzanine loans on multi-family properties
Variable Interest Entity [Line Items]
Total assets	0	0
Investments in unconsolidated entities | Equity investments in entities that invest in residential properties and loans
Variable Interest Entity [Line Items]
Total assets	$ 65,572	10,954
Investments in unconsolidated entities | Mulit Family CMBS
Variable Interest Entity [Line Items]
Total assets		$ 0

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph a
-URI http://asc.fasb.org/extlink&oid=118582676&loc=d3e5728-111685

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