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Real Estate Securities - Additional Information (Details) | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) investment | Dec. 31, 2018 USD ($) investment
Investment Holdings [Line Items] |  |
Trading securities | $ 860,540,000 | $ 1,118,612,000
Trading securities acquired | 367,000,000 | 688,000,000
Trading securities sold | 593,000,000 | 415,000,000
Change in trading securities | 56,000,000 | (8,000,000)
Available-for-sale securities | 239,334,000 | 333,882,000
AFS securities acquired | 27,000,000 | 8,000,000
AFS securities sold | $ 110,000,000 | 144,000,000
AFS net realized gains |  | $ 27,000,000
Number of AFS securities | investment | 107 | 128
Number of securities in unrealized loss position | investment | 1 | 7
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer | investment | 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 losses, income statement | $ 100,000 |
Other than temporary impairments | 0 |
Interest Only Senior Trading Securities |  |
Investment Holdings [Line Items] |  |
Debt securities, trading | 64,000,000 | $ 82,000,000
Unpaid principal balance | 84,000,000 | 78,000,000
Certificated Servicing Strips |  |
Investment Holdings [Line Items] |  |
Debt securities, trading | 36,000,000 | 43,000,000
Third Party Commercial/Multifamily Securities |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 9,000,000 |
Re-preforming Loans Securities |  |
Investment Holdings [Line Items] |  |
Debt securities, trading | 55,000,000 | 48,000,000
Residential |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 230,000,000 |
Marketable securities, less than five years | 0 |
Marketable securities, due from five to ten years | 8,000,000 |
Subordinate Securities |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 199,855,000 | 209,860,000
Mezzanine |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 13,687,000 | 36,407,000
Mezzanine | Trading securities |  |
Investment Holdings [Line Items] |  |
Unpaid principal balance | 537,000,000 | 646,000,000
Mezzanine | Sequoia Securities |  |
Investment Holdings [Line Items] |  |
Trading securities | 39,000,000 | 68,000,000
Mezzanine | Subordinate Securities |  |
Investment Holdings [Line Items] |  |
Trading securities | 538,489,000 | 610,819,000
Available-for-sale securities | 13,687,000 | 36,407,000
Mezzanine | Other Third Party Securities |  |
Investment Holdings [Line Items] |  |
Trading securities | 104,000,000 | 114,000,000
Mezzanine | Third Party Commercial/Multifamily Securities |  |
Investment Holdings [Line Items] |  |
Trading securities | 395,000,000 | 429,000,000
Mezzanine | Re-preforming Loans Securities |  |
Investment Holdings [Line Items] |  |
Trading securities | 30,000,000 | 11,000,000
Subordinate | Trading securities |  |
Investment Holdings [Line Items] |  |
Unpaid principal balance | 302,000,000 | 476,000,000
Subordinate | Subordinate Securities |  |
Investment Holdings [Line Items] |  |
Trading securities | 171,984,000 | 349,123,000
Available-for-sale securities | 199,855,000 | 209,860,000
Subordinate | Other Third Party Securities |  |
Investment Holdings [Line Items] |  |
Trading securities | 82,000,000 | 72,000,000
Subordinate | CRT Securities |  |
Investment Holdings [Line Items] |  |
Trading securities | 90,000,000 | 277,000,000
Subordinate | Re-preforming Loans Securities |  |
Investment Holdings [Line Items] |  |
Trading securities | $ 76,000,000 | $ 63,000,000

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