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Real Estate Securities - Additional Information (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) Investment | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) Investment | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) Investment
Investment Holdings [Line Items] |  |  |  |  |
Trading securities pledged as collateral | $ 668,000,000 |  | $ 668,000,000 |  |
Trading securities | 1,108,243,000 |  | 1,108,243,000 |  | $ 968,844,000
Trading securities acquired | 189,000,000 | $ 171,000,000 | 567,000,000 | $ 432,000,000 |
Trading securities sold | 79,000,000 | 25,000,000 | 323,000,000 | 85,000,000 |
Increase (decrease) in valuation of trading securities | 6,000,000 | 1,000,000 | 2,000,000 | 31,000,000 |
Available-for-sale securities purchased | 1,000,000 | 4,000,000 | 7,000,000 | 32,000,000 |
Available-for-sale securities sold | 26,000,000 | 23,000,000 | 118,000,000 | 61,000,000 |
Net realized gains on AFS securities | $ 7,000,000 | 2,000,000 | $ 21,000,000 | 9,000,000 |
Number of AFS securities (in investments) | Investment | 139 |  | 139 |  | 167
Number of securities in unrealized loss position (in investments) | Investment | 11 |  | 11 |  | 9
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer (in investments) | Investment | 3 |  | 3 |  | 3
Investment fair value changes, net | $ 10,332,000 | 324,000 | $ 12,830,000 | 9,990,000 |
Other than temporary impairment recognized in AOCI | 300,000 |  | 500,000 | 400,000 |
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized Gains on Available-for-Sale Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Other than temporary impairment | 400,000 |  | 600,000 |  |
Investment fair value changes, net | (33,000) | $ (3,000) | (89,000) | $ (248,000) |
Residential |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Securities pledged as collateral | 918,000,000 |  | 918,000,000 |  | $ 788,000,000
Gross unrealized losses | 1,235,000 |  | 1,235,000 |  | 1,367,000
Subordinate Securities | Residential |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Gross unrealized losses | 567,000 |  | 567,000 |  | 132,000
Sequoia securities | Subordinate Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 68,000,000 |  | 68,000,000 |  | 68,000,000
Sequoia securities | Sequoia Choice |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities pledged as collateral | 129,000,000 |  | 129,000,000 |  |
Interest-only Senior Trading Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Debt securities, trading | 86,000,000 |  | 86,000,000 |  | 70,000,000
Unpaid principal balance | 79,000,000 |  | 79,000,000 |  | 0
Interest-only Senior Trading Securities | Certificated Servicing Strips |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Debt securities, trading | 42,000,000 |  | 42,000,000 |  | 15,000,000
Trading securities | Residential Subordinate Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Unpaid principal balance | 1,070,000,000 |  | 1,070,000,000 |  | 943,000,000
CRT securities | Mezzanine Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 945,000,000 |  | 945,000,000 |  | 899,000,000
CRT securities | Subordinate Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 236,000,000 |  | 236,000,000 |  | 301,000,000
Other third party securities | Subordinate Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 225,000,000 |  | 225,000,000 |  | 206,000,000
Third-party multifamily mortgage-backed securities | Subordinate Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 417,000,000 |  | 417,000,000 |  | $ 324,000,000
Residential |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Marketable securities, less than five years | 100,000 |  | 100,000 |  |
Marketable securities, due from five to ten years | 2,000,000 |  | 2,000,000 |  |
Residential | AFS securities retained, at fair value |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Securities pledged as collateral | $ 121,000,000 |  | $ 121,000,000 |  |

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