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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 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | $ 574,788 | $ 572,752
Senior Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 137,209 | 136,546
Re-REMIC |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 73,730 | 85,479
Subordinate Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 363,849 | 350,727
Residential |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 704,317 | 700,829
Credit reserve | (49,226) | (47,473)
Unamortized discount, net | (196,931) | (198,112)
Amortized cost | 458,160 | 455,244
Gross unrealized gains | 119,308 | 120,677
Gross unrealized losses | (2,680) | (3,169)
Carrying Value | 574,788 | 572,752
Residential | Senior Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 144,676 | 148,862
Credit reserve | (4,521) | (4,814)
Unamortized discount, net | (38,156) | (41,877)
Amortized cost | 101,999 | 102,171
Gross unrealized gains | 37,078 | 36,304
Gross unrealized losses | (1,868) | (1,929)
Carrying Value | 137,209 | 136,546
Residential | Re-REMIC |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 81,935 | 95,608
Credit reserve | (5,609) | (6,857)
Unamortized discount, net | (16,507) | (19,613)
Amortized cost | 59,819 | 69,138
Gross unrealized gains | 13,911 | 16,341
Gross unrealized losses | 0 | 0
Carrying Value | 73,730 | 85,479
Residential | Subordinate Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 477,706 | 456,359
Credit reserve | (39,096) | (35,802)
Unamortized discount, net | (142,268) | (136,622)
Amortized cost | 296,342 | 283,935
Gross unrealized gains | 68,319 | 68,032
Gross unrealized losses | (812) | (1,240)
Carrying Value | $ 363,849 | $ 350,727

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