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Real Estate Securities - Additional Information (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 USD ($) Investment | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) Investment
Investment Holdings [Line Items] |  |  |
Trading securities | $ 591,152,000 |  | $ 445,687,000
Trading securities acquired | 154,000,000 | $ 50,000,000 |
Trading securities sold | 9,000,000 | 218,000,000 |
Increase (decrease) in valuation of trading securities | 11,000,000 | (4,000,000) |
Trading securities pledged as collateral | 191,000,000 |  |
Available-for-sale securities purchased | 25,000,000 | 16,000,000 |
Available-for-sale securities sold | 19,000,000 | 126,000,000 |
Net realized gains on AFS securities | $ 5,000,000 | 9,000,000 |
Number of AFS securities (in investments) | Investment | 186 |  | 186
Number of securities in unrealized loss position (in investments) | Investment | 22 |  | 19
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer (in investments) | Investment | 10 |  | 10
Other-than-temporary impairments related to AFS securities | $ 200,000 |  |
Other than temporary impairment recognized in AOCI | 100,000 | $ 0 |
Residential |  |  |
Investment Holdings [Line Items] |  |  |
Gross unrealized losses | 2,680,000 |  | $ 3,169,000
Subordinate Securities |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities | 552,262,000 |  | 408,620,000
Subordinate Securities | Residential |  |  |
Investment Holdings [Line Items] |  |  |
Gross unrealized losses | $ 812,000 |  | 1,240,000
Re-REMIC |  |  |
Investment Holdings [Line Items] |  |  |
Number Of Re-REMICs exchanged during the period (in investments) | Investment | 2 |  |
Fair value of equity trading securities | $ 12,000,000 |  |
Re-REMIC | Residential |  |  |
Investment Holdings [Line Items] |  |  |
Gross unrealized losses | 0 |  | 0
Trading securities | Residential Subordinate Securities |  |  |
Investment Holdings [Line Items] |  |  |
Unpaid principal balance | 576,000,000 |  | 434,000,000
CRT securities | Subordinate Securities |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities | 198,000,000 |  | 152,000,000
Sequoia securities | Subordinate Securities |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities | 33,000,000 |  | 15,000,000
Other third party securities | Subordinate Securities |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities | 183,000,000 |  | 149,000,000
Commercial mortgage backed securities | Subordinate Securities |  |  |
Investment Holdings [Line Items] |  |  |
Trading securities | 139,000,000 |  | $ 92,000,000
Residential |  |  |
Investment Holdings [Line Items] |  |  |
Marketable securities, less than five years | 100,000 |  |
Marketable securities, due from five to ten years | 500,000 |  |
Residential | AFS securities retained, at fair value |  |  |
Investment Holdings [Line Items] |  |  |
Securities pledged as collateral | $ 195,000,000 |  |

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