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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Key Details of Financing VIEs (Details) $ in Thousands | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) securitization
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Securitized debt, carrying value | $ 81,537 | $ 158,867
Multi-family CMBS Re-securitization |  |
Variable Interest Entity [Line Items] |  |
Securitized debt, principal amount | 33,350 | 33,553
Securitized debt, carrying value | $ 29,164 | 28,332
Multi-family CMBS Re-securitization | LIBOR |  |
Variable Interest Entity [Line Items] |  |
Interest rate (as a percent) | 5.35% |
Distressed residential mortgage loans |  |
Variable Interest Entity [Line Items] |  |
Securitized debt, principal amount | $ 53,089 | 132,319
Securitized debt, carrying value | $ 52,373 | 130,535
Distressed residential mortgage loans | LIBOR |  |
Variable Interest Entity [Line Items] |  |
Interest rate (as a percent) | 4.00% |
Distressed residential mortgage loans held in securitization trusts (net) | Distressed residential mortgage loans |  |
Variable Interest Entity [Line Items] |  |
Residential mortgage loans held in securitization | $ 121,791 | $ 195,347
K-Series | Multi-family CMBS Re-securitization |  |
Variable Interest Entity [Line Items] |  |
Number of securitizations | securitization |  | 2

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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 The fair value as of the balance sheet date of firm holdings in mortgages, mortgage backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the mortgage backed security) and asset-backed securities that are primarily paid from the cash flows of a discrete pool of receivables or other financial assets (such as credit-card receivables), either fixed or revolving, that by their terms convert into cash within a finite time period. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + 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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