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Real Estate Securities - Components of Carrying Value (Which Equals Fair Value) of Residential Available for Sale Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | $ 971,013 | $ 1,267,624
Senior Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 409,313 | 487,557
Senior Securities | Prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 251,273 | 307,813
Senior Securities | Non-prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 158,040 | 179,744
Re-REMIC |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 167,639 | 168,347
Subordinate Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 394,061 | 611,720
Subordinate Securities | Prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 233,458 | 448,838
Subordinate Securities | Non-prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 1,000 | 1,000
Residential |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 1,114,917 | 1,445,079
Credit reserve | (55,341) | (70,067)
Unamortized discount, net | (261,729) | (296,342)
Amortized cost | 797,847 | 1,078,670
Gross unrealized gains | 177,576 | 191,750
Gross unrealized losses | (4,410) | (2,796)
Carrying Value | 971,013 | 1,267,624
Residential | Senior Securities | Prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 257,526 | 311,573
Credit reserve | (2,377) | (3,660)
Unamortized discount, net | (27,476) | (34,782)
Amortized cost | 227,673 | 273,131
Gross unrealized gains | 26,899 | 35,980
Gross unrealized losses | (3,299) | (1,298)
Carrying Value | 251,273 | 307,813
Residential | Senior Securities | Non-prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 174,285 | 196,258
Credit reserve | (8,964) | (9,644)
Unamortized discount, net | (25,505) | (31,491)
Amortized cost | 139,816 | 155,123
Gross unrealized gains | 18,515 | 24,682
Gross unrealized losses | (291) | (61)
Carrying Value | 158,040 | 179,744
Residential | Re-REMIC |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 192,215 | 195,098
Credit reserve | (11,135) | (15,202)
Unamortized discount, net | (74,377) | (79,611)
Amortized cost | 106,703 | 100,285
Gross unrealized gains | 60,936 | 68,062
Gross unrealized losses | 0 | 0
Carrying Value | 167,639 | 168,347
Residential | Subordinate Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 490,891 | 742,150
Credit reserve | (32,865) | (41,561)
Unamortized discount, net | (134,371) | (150,458)
Amortized cost | 323,655 | 550,131
Gross unrealized gains | 71,226 | 63,026
Gross unrealized losses | (820) | (1,437)
Carrying Value | $ 394,061 | $ 611,720

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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=27724398&loc=d3e27161-111563 + Details
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