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Real Estate Securities - Components of Carrying Value (Which Equals Fair Value) of Residential Available for Sale Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | $ 549,942 | $ 572,752
Senior Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 128,329 | 136,546
Re-REMIC |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 73,337 | 85,479
Subordinate Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 348,276 | 350,727
Residential |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 673,533 | 700,829
Credit reserve | (47,588) | (47,473)
Unamortized discount, net | (192,063) | (198,112)
Amortized cost | 433,882 | 455,244
Gross unrealized gains | 118,526 | 120,677
Gross unrealized losses | (2,466) | (3,169)
Carrying Value | 549,942 | 572,752
Residential | Senior Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 134,042 | 148,862
Credit reserve | (3,622) | (4,814)
Unamortized discount, net | (35,257) | (41,877)
Amortized cost | 95,163 | 102,171
Gross unrealized gains | 34,993 | 36,304
Gross unrealized losses | (1,827) | (1,929)
Carrying Value | 128,329 | 136,546
Residential | Re-REMIC |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 81,235 | 95,608
Credit reserve | (5,913) | (6,857)
Unamortized discount, net | (15,153) | (19,613)
Amortized cost | 60,169 | 69,138
Gross unrealized gains | 13,168 | 16,341
Gross unrealized losses | 0 | 0
Carrying Value | 73,337 | 85,479
Residential | Subordinate Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 458,256 | 456,359
Credit reserve | (38,053) | (35,802)
Unamortized discount, net | (141,653) | (136,622)
Amortized cost | 278,550 | 283,935
Gross unrealized gains | 70,365 | 68,032
Gross unrealized losses | (639) | (1,240)
Carrying Value | $ 348,276 | $ 350,727

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