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Use of Special Purpose Entities and Variable Interest Entities - Classification and Carrying Value of Unconsolidated VIEs (Details) $ in Thousands | Sep. 30, 2017 USD ($) securitization | Dec. 31, 2016 USD ($) securitization
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Unconsolidated VIE, maximum loss exposure | $ 203,600 | $ 185,300
Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Total assets | 203,572 | 185,301
Variable Interest Entity, Not Primary Beneficiary | Investment securities, available for sale, at fair value |  |
Variable Interest Entity [Line Items] |  |
Total assets | 46,623 | 43,897
Variable Interest Entity, Not Primary Beneficiary | Receivables and other assets |  |
Variable Interest Entity [Line Items] |  |
Total assets | 73 | 74
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loan and preferred equity investments |  |
Variable Interest Entity [Line Items] |  |
Total assets | 122,578 | 100,150
Variable Interest Entity, Not Primary Beneficiary | Investment in unconsolidated entities |  |
Variable Interest Entity [Line Items] |  |
Total assets | 34,298 | 41,180
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS |  |
Variable Interest Entity [Line Items] |  |
Total assets | 46,696 | 43,971
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS | Investment securities, available for sale, at fair value |  |
Variable Interest Entity [Line Items] |  |
Total assets | 46,623 | 43,897
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS | Receivables and other assets |  |
Variable Interest Entity [Line Items] |  |
Total assets | 73 | 74
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS | Mezzanine loan and preferred equity investments |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Variable Interest Entity, Not Primary Beneficiary | Multi-family CMBS | Investment in unconsolidated entities |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loan on multi-family properties |  |
Variable Interest Entity [Line Items] |  |
Total assets | 6,875 | 18,881
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loan on multi-family properties | Investment securities, available for sale, at fair value |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loan on multi-family properties | Receivables and other assets |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loan on multi-family properties | Mezzanine loan and preferred equity investments |  |
Variable Interest Entity [Line Items] |  |
Total assets | 6,875 | 18,881
Variable Interest Entity, Not Primary Beneficiary | Mezzanine loan on multi-family properties | Investment in unconsolidated entities |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investment on multi-family properties |  |
Variable Interest Entity [Line Items] |  |
Total assets | 125,945 | 100,197
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investment on multi-family properties | Investment securities, available for sale, at fair value |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investment on multi-family properties | Receivables and other assets |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investment on multi-family properties | Mezzanine loan and preferred equity investments |  |
Variable Interest Entity [Line Items] |  |
Total assets | 115,703 | 81,269
Variable Interest Entity, Not Primary Beneficiary | Preferred equity investment on multi-family properties | Investment in unconsolidated entities |  |
Variable Interest Entity [Line Items] |  |
Total assets | 10,242 | 18,928
Variable Interest Entity, Not Primary Beneficiary | Equity investment in entities that invest in multi-family properties |  |
Variable Interest Entity [Line Items] |  |
Total assets | 24,056 | 22,252
Variable Interest Entity, Not Primary Beneficiary | Equity investment in entities that invest in multi-family properties | Investment securities, available for sale, at fair value |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Variable Interest Entity, Not Primary Beneficiary | Equity investment in entities that invest in multi-family properties | Receivables and other assets |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Variable Interest Entity, Not Primary Beneficiary | Equity investment in entities that invest in multi-family properties | Mezzanine loan and preferred equity investments |  |
Variable Interest Entity [Line Items] |  |
Total assets | 0 | 0
Variable Interest Entity, Not Primary Beneficiary | Equity investment in entities that invest in multi-family properties | Investment in unconsolidated entities |  |
Variable Interest Entity [Line Items] |  |
Total assets | $ 24,056 | $ 22,252
K-Series | Multi-family collateralized mortgage backed securities |  |
Variable Interest Entity [Line Items] |  |
Number of securitizations | securitization | 2 | 2

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- Definition Number of Securitizations + References No definition available. + Details
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- Definition The item represents the maximum loss exposure on unconsolidated variable interest entities. + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5728-111685 + Details
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