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Real Estate Securities - Gross Realized Gains and Losses on Sales and Calls of Available for Sale Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items] |  |  |
Total Realized Gains on Sales and Calls of AFS Securities, net | $ 14,107 | $ 22,515 | $ 36,369
Call Option |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross realized gains | 677 | 1,210 | 2,167
Gross realized losses | (497) | 0 | (112)
Put Option |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross realized gains | 13,927 | 23,598 | 34,922
Gross realized losses | $ 0 | $ (2,293) | $ (608)

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- Definition Available-for-sale Securities, Gross Realized Gain (Loss) On Sales And Calls + References No definition available. + Details
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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=73527792&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=73527792&loc=d3e27357-111563 + Details
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