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Real Estate Securities - Additional Information (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) Investment | Dec. 31, 2016 USD ($) Investment | Dec. 31, 2015 USD ($)
Investment Holdings [Line Items] |  |  |
Trading securities pledged as collateral | $ 593,000 |  |
Trading securities | 968,844 | $ 445,687 |
Trading securities acquired | 661,000 | 307,000 |
Trading securities sold | 132,000 | 241,000 |
Change in trading securities | 40,000 | 11,000 |
AFS securities acquired | 40,000 | 35,000 |
AFS securities sold | 90,000 | 253,000 |
AFS net realized gains | $ 14,000 | $ 21,000 |
Number of AFS securities | Investment | 167 | 186 |
Number of securities in unrealized loss position | Investment | 9 | 19 |
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer | Investment | 3 | 10 |
Other than temporary impairment losses, income statement | $ 1,000 | $ 400 |
Investment fair value changes, net | 10,374 | (28,574) | $ (21,357)
Accumulated other comprehensive income, other-than-temporary impairments | 400 | 3,000 |
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized Gains on Available-for-Sale Securities |  |  |
Investment Holdings [Line Items] |  |  |
Other than temporary impairment losses, income statement | 1,000 |  |
Investment fair value changes, net | (1,012) | (368) |
Residential |  |  |
Investment Holdings [Line Items] |  |  |
Gross unrealized losses | 1,367 | 3,169 |
Residential |  |  |
Investment Holdings [Line Items] |  |  |
Marketable securities, less than five years | 100 |  |
Marketable securities, due from five to ten years | 5,000 |  |
Residential Subordinate Securities | Trading securities |  |  |
Investment Holdings [Line Items] |  |  |
Unpaid principal balance | 943,000 | 434,000 |
Subordinate Securities |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities | 898,869 | 408,620 |
Subordinate Securities | Residential |  |  |
Investment Holdings [Line Items] |  |  |
Gross unrealized losses | 132 | 1,240 |
Subordinate Securities | Credit Risk Transfer (CRT) Securities |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities | 301,000 | 152,000 |
Subordinate Securities | Sequoia Securities |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities | 68,000 | 15,000 |
Subordinate Securities | Other Third Party Securities |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities | 206,000 | 149,000 |
Subordinate Securities | Third Party Multifamily Mortgage-backed Securities |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities | 324,000 | 92,000 |
AFS Securities | Residential |  |  |
Investment Holdings [Line Items] |  |  |
Securities pledged as collateral | $ 195,000 |  |
Re-REMIC |  |  |
Investment Holdings [Line Items] |  |  |
Number of AFS securities | Investment | 3 |  |
Trading securities, fair value | $ 47,000 |  |
Re-REMIC | Residential |  |  |
Investment Holdings [Line Items] |  |  |
Gross unrealized losses | $ 0 | $ 0 |

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