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Real Estate Securities - Additional Information (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) Investment | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) Investment
Investment Holdings [Line Items] |  |  |
Trading securities pledged as collateral | $ 486,000,000 |  |
Trading securities | 907,432,000 |  | $ 968,844,000
Trading securities acquired | 145,000,000 | $ 154,000,000 |
Trading securities sold | 182,000,000 | 9,000,000 |
Increase (decrease) in valuation of trading securities | (3,000,000) | 11,000,000 |
Available-for-sale securities purchased | 4,000,000 | 25,000,000 |
Available-for-sale securities sold | 51,000,000 | 19,000,000 |
Net realized gains on AFS securities | $ 9,000,000 | 5,000,000 |
Number of AFS securities (in investments) | Investment | 152 |  | 167
Number of securities in unrealized loss position (in investments) | Investment | 13 |  | 9
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer (in investments) | Investment | 3 |  | 3
Impairment losses, investments | $ 0 |  |
Investment fair value changes, net | (1,609,000) | (1,551,000) |
Other than temporary impairment recognized in AOCI |  | 100,000 |
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized Gains on Available-for-Sale Securities |  |  |
Investment Holdings [Line Items] |  |  |
Impairment losses, investments |  | 200,000 |
Investment fair value changes, net | 0 | $ 117,000 |
Residential |  |  |
Investment Holdings [Line Items] |  |  |
Gross unrealized losses | 1,322,000 |  | $ 1,367,000
REO |  |  |
Investment Holdings [Line Items] |  |  |
Assets | 1,060,837,000 |  |
Subordinate Securities | Residential |  |  |
Investment Holdings [Line Items] |  |  |
Gross unrealized losses | 367,000 |  | 132,000
Subordinate Securities | REO |  |  |
Investment Holdings [Line Items] |  |  |
Assets | 374,785,000 |  |
Re-REMIC | REO |  |  |
Investment Holdings [Line Items] |  |  |
Assets | 38,000,000 |  | 39,000,000
Trading securities | Residential Subordinate Securities |  |  |
Investment Holdings [Line Items] |  |  |
Unpaid principal balance | 900,000,000 |  | 943,000,000
CRT securities | Subordinate Securities |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities | 246,000,000 |  | 301,000,000
Sequoia securities |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities pledged as collateral | 57,000,000 |  |
Sequoia securities | Subordinate Securities |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities | 54,000,000 |  | 68,000,000
Other third party securities | Subordinate Securities |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities | 148,000,000 |  | 206,000,000
Third-party multifamily mortgage-backed securities | Subordinate Securities |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities | 377,000,000 |  | $ 324,000,000
Residential |  |  |
Investment Holdings [Line Items] |  |  |
Marketable securities, less than five years | 100,000 |  |
Marketable securities, due from five to ten years | 2,000,000 |  |
Residential | AFS securities retained, at fair value |  |  |
Investment Holdings [Line Items] |  |  |
Securities pledged as collateral | $ 178,000,000 |  |

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