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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 | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | $ 1,041,458 | $ 1,267,624
Senior Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 445,336 | 487,557
Senior Securities | Prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 278,960 | 307,813
Senior Securities | Non-prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 166,376 | 179,744
Re-REMIC |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 169,084 | 168,347
Subordinate Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 427,038 | 611,720
Subordinate Securities | Prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Carrying Value | 257,263 | 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 | 1,194,372 | 1,445,079
Credit reserve | (61,700) | (70,067)
Unamortized discount, net | (273,119) | (296,342)
Amortized cost | 859,553 | 1,078,670
Gross unrealized gains | 184,857 | 191,750
Gross unrealized losses | (2,952) | (2,796)
Carrying Value | 1,041,458 | 1,267,624
Residential | Senior Securities | Prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 282,921 | 311,573
Credit reserve | (2,650) | (3,660)
Unamortized discount, net | (30,401) | (34,782)
Amortized cost | 249,870 | 273,131
Gross unrealized gains | 31,196 | 35,980
Gross unrealized losses | (2,106) | (1,298)
Carrying Value | 278,960 | 307,813
Residential | Senior Securities | Non-prime |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 182,719 | 196,258
Credit reserve | (9,175) | (9,644)
Unamortized discount, net | (27,533) | (31,491)
Amortized cost | 146,011 | 155,123
Gross unrealized gains | 20,550 | 24,682
Gross unrealized losses | (185) | (61)
Carrying Value | 166,376 | 179,744
Residential | Re-REMIC |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 193,221 | 195,098
Credit reserve | (13,071) | (15,202)
Unamortized discount, net | (75,658) | (79,611)
Amortized cost | 104,492 | 100,285
Gross unrealized gains | 64,592 | 68,062
Gross unrealized losses | 0 | 0
Carrying Value | 169,084 | 168,347
Residential | Subordinate Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Principal balance | 535,511 | 742,150
Credit reserve | (36,804) | (41,561)
Unamortized discount, net | (139,527) | (150,458)
Amortized cost | 359,180 | 550,131
Gross unrealized gains | 68,519 | 63,026
Gross unrealized losses | (661) | (1,437)
Carrying Value | $ 427,038 | $ 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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