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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items] |  |  |
Gross realized gains | $ 4,635 | $ 17,582 |
Total Realized Gains on Sales and Calls of AFS Securities, net | 4,640 | 23,821 | $ 27,041
Sales |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Gross realized gains | 8,779 | 17,582 | 27,127
Gross realized losses | (4,144) | 0 | (129)
Calls |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Gross realized gains | $ 5 | $ 6,239 | $ 43

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- Definition Amount of realized gain 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 + Details
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- Definition Amount of realized loss 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 + Details
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