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Real Estate Securities - Components of Carrying Value (Which Equals Fair Value) of Residential Available for Sale Securities (Details) - Residential - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | $ 552,935 | $ 608,145
Credit reserve | (40,616) | (46,549)
Unamortized discount, net | (178,302) | (183,753)
Amortized cost | 334,017 | 377,843
Gross unrealized gains | 117,593 | 131,190
Gross unrealized losses | (1,322) | (1,367)
Carrying Value | 450,288 | 507,666
Senior IO Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 172,026 | 189,125
Credit reserve | (8,206) | (8,756)
Unamortized discount, net | (39,174) | (44,041)
Amortized cost | 124,646 | 136,328
Gross unrealized gains | 41,919 | 44,771
Gross unrealized losses | (955) | (1,235)
Carrying Value | 165,610 | 179,864
Mezzanine |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 67,995 | 91,471
Credit reserve | 0 | 0
Unamortized discount, net | (6,959) | (9,407)
Amortized cost | 61,036 | 82,064
Gross unrealized gains | 6,255 | 9,938
Gross unrealized losses | 0 | 0
Carrying Value | 67,291 | 92,002
Subordinate Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 312,914 | 327,549
Credit reserve | (32,410) | (37,793)
Unamortized discount, net | (132,169) | (130,305)
Amortized cost | 148,335 | 159,451
Gross unrealized gains | 69,419 | 76,481
Gross unrealized losses | (367) | (132)
Carrying Value | $ 217,387 | $ 235,800

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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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