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Consolidated K-Series - Narrative (Details) $ in Millions | Sep. 30, 2019 USD ($) securitization | Dec. 31, 2018 USD ($) securitization
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Multi-family loans held in securitization trusts |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 14,700.0 | $ 11,500.0
Multi-family collateralized debt obligations, at fair value |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Carrying Value | $ 14,700.0 | $ 11,500.0
Weighted average interest rate | 4.11% | 3.96%
Consolidated K-Series |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
K-Series, carrying value | $ 885.1 | $ 657.6
Consolidated K-Series | Freddie Mac Multi-family loan K-Series |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of securitizations | securitization | 12 | 9

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- Definition Number of Securitizations + References No definition available. + Details
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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 Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column G)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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