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Real Estate Securities - Gross Realized Gains and Losses on Sales and Calls of Available for Sale Securities (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross realized gains | $ 4,053 | $ 10,227 | $ 14,315 | $ 11,219
Gross realized losses | 0 | (2,713) | 0 | (2,713)
Total Realized Gains on Sales and Calls of AFS Securities, net | 5,548 | 7,976 | 16,170 | 9,955
Call Option |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross realized gains | 1,607 | 462 | 1,967 | 1,449
Gross realized losses | $ (112) | $ 0 | $ (112) | $ 0

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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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