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Real Estate Securities - Additional Information (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) investment | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) investment | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) investment
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | $ 1,013,785,000 |  | $ 1,013,785,000 |  | $ 1,118,612,000
Trading securities acquired | 66,000,000 | $ 189,000,000 | 335,000,000 | $ 567,000,000 |
Trading securities sold | 236,000,000 | 79,000,000 | 397,000,000 | 323,000,000 |
Increase (decrease) in valuation of trading securities | 15,000,000 | 6,000,000 | 56,000,000 | 2,000,000 |
Available-for-sale securities purchased | 12,000,000 | 1,000,000 | 21,000,000 | 7,000,000 |
Available-for-sale securities sold | 15,000,000 | 26,000,000 | 82,000,000 | 118,000,000 |
Net realized gains on AFS securities | $ 4,000,000 | $ 7,000,000 | $ 13,000,000 | $ 21,000,000 |
Number of AFS securities (in investments) | investment | 113 |  | 113 |  | 128
Number of securities in unrealized loss position | investment | 1 |  | 1 |  | 7
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer (in investments) | investment | 1 |  | 1 |  | 3
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized Gains on Available-for-Sale Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Other than temporary impairment | $ 0 |  | $ 0 |  |
Subordinate |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 864,000,000 |  | 864,000,000 |  | $ 960,000,000
Interest Only Senior Trading Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Debt securities, trading | 58,000,000 |  | 58,000,000 |  | 82,000,000
Unpaid principal balance | 88,000,000 |  | 88,000,000 |  | 78,000,000
Certificated Servicing Strips |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Debt securities, trading | 29,000,000 |  | 29,000,000 |  | 43,000,000
Residential |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Securities pledged as collateral | 736,000,000 |  | 736,000,000 |  | 844,000,000
Marketable securities, due from five to ten years | 8,000,000 |  | 8,000,000 |  |
Residential Subordinate Securities | Trading securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Unpaid principal balance | 1,010,000,000.00 |  | 1,010,000,000.00 |  | 1,120,000,000
Subordinate | Credit Risk Transfer (CRT) Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 128,000,000 |  | 128,000,000 |  | 277,000,000
Subordinate | Sequoia securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 65,000,000 |  | 65,000,000 |  | 68,000,000
Subordinate | Other Third Party Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 207,000,000 |  | 207,000,000 |  | 186,000,000
Subordinate | Third Party Multifamily Mortgage-backed Securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities | 464,000,000 |  | 464,000,000 |  | 429,000,000
Sequoia Choice |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities pledged as collateral |  |  |  |  | 130,000,000
Freddie Mac SLST |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities pledged as collateral |  |  |  |  | 229,000,000
Freddie Mac K-Series |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities pledged as collateral |  |  |  |  | $ 18,000,000
Short Term Borrowing Agreement |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities pledged as collateral | 677,000,000 |  | 677,000,000 |  |
Short Term Borrowing Agreement | AFS securities retained, at fair value | Residential |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Securities pledged as collateral | 59,000,000 |  | 59,000,000 |  |
Short Term Borrowing Agreement | Sequoia Choice | Sequoia securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities pledged as collateral | 113,000,000 |  | 113,000,000 |  |
Short Term Borrowing Agreement | Freddie Mac SLST | Sequoia securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities pledged as collateral | 385,000,000 |  | 385,000,000 |  |
Short Term Borrowing Agreement | Freddie Mac K-Series | Sequoia securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities pledged as collateral | 209,000,000 |  | 209,000,000 |  |
Subordinate Securities Financing Facility |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities pledged as collateral | 4,000,000 |  | 4,000,000 |  |
Subordinate Securities Financing Facility | AFS securities retained, at fair value | Residential |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Securities pledged as collateral | 123,000,000 |  | 123,000,000 |  |
Subordinate Securities Financing Facility | Sequoia Choice | Sequoia securities |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities pledged as collateral | 126,000,000 |  | 126,000,000 |  |
Borrowing Agreement With FHLBC |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Trading securities pledged as collateral | $ 41,000,000 |  | $ 41,000,000 |  |

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