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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 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Total assets | $ 381,714 | $ 269,753
Investment securities, available for sale, at fair value, held in securitization trusts |  |
Variable Interest Entity [Line Items] |  |
Total assets | 48,254 | 52,700
Receivables and other assets |  |
Variable Interest Entity [Line Items] |  |
Total assets |  | 72
Preferred equity and mezzanine loan investments |  |
Variable Interest Entity [Line Items] |  |
Total assets | 178,997 | 165,555
Investments in unconsolidated entities |  |
Variable Interest Entity [Line Items] |  |
Total assets | 154,463 | 51,426
ABS |  |
Variable Interest Entity [Line Items] |  |
Total assets | 48,254 |
ABS | Investment securities, available for sale, at fair value, held in securitization trusts |  |
Variable Interest Entity [Line Items] |  |
Total assets | 48,254 |
ABS | Preferred equity and mezzanine loan investments |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 |
ABS | Investments in unconsolidated entities |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 |
Preferred equity investments in multi-family properties |  |
Variable Interest Entity [Line Items] |  |
Total assets | 265,510 | 195,101
Preferred equity investments in multi-family properties | Investment securities, available for sale, at fair value, held in securitization trusts |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Preferred equity investments in multi-family properties | Receivables and other assets |  |
Variable Interest Entity [Line Items] |  |
Total assets |  | 0
Preferred equity investments in multi-family properties | Preferred equity and mezzanine loan investments |  |
Variable Interest Entity [Line Items] |  |
Total assets | 172,826 | 154,629
Preferred equity investments in multi-family properties | Investments in unconsolidated entities |  |
Variable Interest Entity [Line Items] |  |
Total assets | 92,684 | 40,472
Multi-family CMBS |  |
Variable Interest Entity [Line Items] |  |
Total assets |  | 52,772
Multi-family CMBS | Investment securities, available for sale, at fair value, held in securitization trusts |  |
Variable Interest Entity [Line Items] |  |
Total assets |  | 52,700
Multi-family CMBS | Receivables and other assets |  |
Variable Interest Entity [Line Items] |  |
Total assets |  | 72
Multi-family CMBS | Preferred equity and mezzanine loan investments |  |
Variable Interest Entity [Line Items] |  |
Total assets |  | 0
Multi-family CMBS | Investments in unconsolidated entities |  |
Variable Interest Entity [Line Items] |  |
Total assets |  | 0
Mezzanine loans on multi-family properties |  |
Variable Interest Entity [Line Items] |  |
Total assets | 6,171 | 10,926
Mezzanine loans on multi-family properties | Investment securities, available for sale, at fair value, held in securitization trusts |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Mezzanine loans on multi-family properties | Receivables and other assets |  |
Variable Interest Entity [Line Items] |  |
Total assets |  | 0
Mezzanine loans on multi-family properties | Preferred equity and mezzanine loan investments |  |
Variable Interest Entity [Line Items] |  |
Total assets | 6,171 | 10,926
Mezzanine loans on multi-family properties | Investments in unconsolidated entities |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Equity investments in entities that invest in residential properties |  |
Variable Interest Entity [Line Items] |  |
Total assets | 61,779 | 10,954
Equity investments in entities that invest in residential properties | Investment securities, available for sale, at fair value, held in securitization trusts |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Equity investments in entities that invest in residential properties | Receivables and other assets |  |
Variable Interest Entity [Line Items] |  |
Total assets |  | 0
Equity investments in entities that invest in residential properties | Preferred equity and mezzanine loan investments |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Equity investments in entities that invest in residential properties | Investments in unconsolidated entities |  |
Variable Interest Entity [Line Items] |  |
Total assets | $ 61,779 | $ 10,954

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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. + Details
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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 + Details
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