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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Classification and Carrying Value of Unconsolidated VIEs (Details) $ in Thousands | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) securitization
--- | --- | ---
Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Total assets | $ 355,514 | $ 269,753
Variable Interest Entity, Not Primary Beneficiary | Investment securities, available for sale, at fair value, held in securitization trusts |  |
Variable Interest Entity [Line Items] |  |
Total assets | 24,739 | 52,700
Variable Interest Entity, Not Primary Beneficiary | Receivables and other assets |  |
Variable Interest Entity [Line Items] |  |
Total assets |  | 72
Variable Interest Entity, Not Primary Beneficiary | Preferred equity and mezzanine loan investments |  |
Variable Interest Entity [Line Items] |  |
Total assets | 191,387 | 165,555
Variable Interest Entity, Not Primary Beneficiary | Investments in unconsolidated entities |  |
Variable Interest Entity [Line Items] |  |
Total assets | 139,388 | 51,426
Variable Interest Entity, Not Primary Beneficiary | ABS |  |
Variable Interest Entity [Line Items] |  |
Total assets | 24,739 |
Variable Interest Entity, Not Primary Beneficiary | ABS | Investment securities, available for sale, at fair value, held in securitization trusts |  |
Variable Interest Entity [Line Items] |  |
Total assets | 24,739 |
Variable Interest Entity, Not Primary Beneficiary | ABS | Preferred equity and mezzanine loan investments |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 |
Variable Interest Entity, Not Primary Beneficiary | ABS | Investments in unconsolidated entities |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 |
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS |  |
Variable Interest Entity [Line Items] |  |
Total assets |  | 52,772
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS | Investment securities, available for sale, at fair value, held in securitization trusts |  |
Variable Interest Entity [Line Items] |  |
Total assets |  | 52,700
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS | Receivables and other assets |  |
Variable Interest Entity [Line Items] |  |
Total assets |  | 72
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS | Preferred equity and mezzanine loan investments |  |
Variable Interest Entity [Line Items] |  |
Total assets |  | 0
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS | Investments in unconsolidated entities |  |
Variable Interest Entity [Line Items] |  |
Total assets |  | 0
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investments in multi-family properties |  |
Variable Interest Entity [Line Items] |  |
Total assets | 262,767 | 195,101
Variable Interest Entity, Not Primary Beneficiary | 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
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investments in multi-family properties | Receivables and other assets |  |
Variable Interest Entity [Line Items] |  |
Total assets |  | 0
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investments in multi-family properties | Preferred equity and mezzanine loan investments |  |
Variable Interest Entity [Line Items] |  |
Total assets | 184,727 | 154,629
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investments in multi-family properties | Investments in unconsolidated entities |  |
Variable Interest Entity [Line Items] |  |
Total assets | 78,040 | 40,472
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loans on multi-family properties |  |
Variable Interest Entity [Line Items] |  |
Total assets | 6,660 | 10,926
Variable Interest Entity, Not Primary Beneficiary | 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
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loans on multi-family properties | Receivables and other assets |  |
Variable Interest Entity [Line Items] |  |
Total assets |  | 0
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loans on multi-family properties | Preferred equity and mezzanine loan investments |  |
Variable Interest Entity [Line Items] |  |
Total assets | 6,660 | 10,926
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loans on multi-family properties | Investments in unconsolidated entities |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Variable Interest Entity, Not Primary Beneficiary | Equity investments in entities that invest in residential properties |  |
Variable Interest Entity [Line Items] |  |
Total assets | 61,348 | 10,954
Variable Interest Entity, Not Primary Beneficiary | 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
Variable Interest Entity, Not Primary Beneficiary | Equity investments in entities that invest in residential properties | Receivables and other assets |  |
Variable Interest Entity [Line Items] |  |
Total assets |  | 0
Variable Interest Entity, Not Primary Beneficiary | Equity investments in entities that invest in residential properties | Preferred equity and mezzanine loan investments |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Variable Interest Entity, Not Primary Beneficiary | Equity investments in entities that invest in residential properties | Investments in unconsolidated entities |  |
Variable Interest Entity [Line Items] |  |
Total assets | $ 61,348 | $ 10,954
K-Series | Multi-family collateralized mortgage backed securities |  |
Variable Interest Entity [Line Items] |  |
Number of securitizations | securitization |  | 2

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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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