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Real Estate Securities - Trading Securities by Collateral Type (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Investment Holdings [Line Items] |  |
Trading securities | $ 668,561 | $ 445,687
Senior Securities |  |
Investment Holdings [Line Items] |  |
Trading securities | 48,633 | 37,067
Subordinate Securities |  |
Investment Holdings [Line Items] |  |
Trading securities | 619,928 | 408,620
Subordinate Securities | Mezzanine |  |
Investment Holdings [Line Items] |  |
Trading securities | 377,286 | 256,226
Subordinate Securities | Subordinate |  |
Investment Holdings [Line Items] |  |
Trading securities | $ 242,642 | $ 152,394

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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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