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Use of Special Purpose Entities and Variable Interest Entities - Securitized Debt (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Carrying value | $ 70,215 | $ 81,537
Multi-family CMBS Re-securitization |  |
Variable Interest Entity [Line Items] |  |
Principal amount | 33,303 | 33,350
Carrying value | 29,390 | $ 29,164
Multi-family CMBS Re-securitization | LIBOR |  |
Variable Interest Entity [Line Items] |  |
Pass-through rate of Notes issued |  | 5.35%
Distressed Residential Mortgage Loan Securitizations |  |
Variable Interest Entity [Line Items] |  |
Principal amount | 41,383 | $ 53,089
Carrying value | $ 40,825 | $ 52,373
Distressed Residential Mortgage Loan Securitizations | LIBOR |  |
Variable Interest Entity [Line Items] |  |
Pass-through rate of Notes issued |  | 4.00%

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- Definition The value of the collateral (typically cash) that the entity receives in a financing transaction in exchange for securities lent. This item represents a liability in the financial statements of the lender of the securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 25 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64840732&loc=d3e113275-111724 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This is the principal amount outstanding for securitized loans only (across all types of loans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82924980&loc=d3e107314-111719 + 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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