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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 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | $ 507,666 | $ 572,752
Senior IO Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 140,989 | 136,546
Re-REMIC |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 38,875 | 85,479
Subordinate Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 327,802 | 350,727
Residential |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 608,145 | 700,829
Credit reserve | (46,549) | (47,473)
Unamortized discount, net | (183,753) | (198,112)
Amortized cost | 377,843 | 455,244
Gross unrealized gains | 131,190 | 120,677
Gross unrealized losses | (1,367) | (3,169)
Carrying Value | 507,666 | 572,752
Residential | Senior IO Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 144,512 | 148,862
Credit reserve | (2,936) | (4,814)
Unamortized discount, net | (34,379) | (41,877)
Amortized cost | 107,197 | 102,171
Gross unrealized gains | 35,027 | 36,304
Gross unrealized losses | (1,235) | (1,929)
Carrying Value | 140,989 | 136,546
Residential | Re-REMIC |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 44,613 | 95,608
Credit reserve | (5,820) | (6,857)
Unamortized discount, net | (9,662) | (19,613)
Amortized cost | 29,131 | 69,138
Gross unrealized gains | 9,744 | 16,341
Gross unrealized losses | 0 | 0
Carrying Value | 38,875 | 85,479
Residential | Subordinate Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 419,020 | 456,359
Credit reserve | (37,793) | (35,802)
Unamortized discount, net | (139,712) | (136,622)
Amortized cost | 241,515 | 283,935
Gross unrealized gains | 86,419 | 68,032
Gross unrealized losses | (132) | (1,240)
Carrying Value | $ 327,802 | $ 350,727

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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