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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 | Sep. 30, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Line Items] |  |
Principal balance | $ 465,084 | $ 608,145
Credit reserve | (41,074) | (46,549)
Unamortized discount, net | (160,799) | (183,753)
Amortized cost | 263,211 | 377,843
Gross unrealized gains | 99,865 | 131,190
Gross unrealized losses | (1,235) | (1,367)
Carrying Value | 361,841 | 507,666
Senior IO Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Principal balance | 119,254 | 189,125
Credit reserve | (7,919) | (8,756)
Unamortized discount, net | (25,173) | (44,041)
Amortized cost | 86,162 | 136,328
Gross unrealized gains | 29,134 | 44,771
Gross unrealized losses | (668) | (1,235)
Carrying Value | 114,628 | 179,864
Mezzanine |  |
Debt Securities, Available-for-sale [Line Items] |  |
Principal balance | 37,385 | 91,471
Credit reserve | 0 | 0
Unamortized discount, net | (3,843) | (9,407)
Amortized cost | 33,542 | 82,064
Gross unrealized gains | 2,835 | 9,938
Gross unrealized losses | 0 | 0
Carrying Value | 36,377 | 92,002
Subordinate Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Principal balance | 308,445 | 327,549
Credit reserve | (33,155) | (37,793)
Unamortized discount, net | (131,783) | (130,305)
Amortized cost | 143,507 | 159,451
Gross unrealized gains | 67,896 | 76,481
Gross unrealized losses | (567) | (132)
Carrying Value | $ 210,836 | $ 235,800

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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