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Investment Securities Available for Sale, at Fair Value - Schedule of Investment Securities Available for Sale in Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, Carrying Value | $ 58,036 | $ 159,841
Less Than 12 months, Gross Unrealized Losses | (387) | (4,526)
Greater Than 12 months, Carrying Value | 36,739 | 8,234
Greater Than 12 months, Gross Unrealized Losses | (53) | (848)
Total, Carrying Value | 94,775 | 168,075
Total Gross Unrealized Losses | (440) | (5,374)
Non-Agency RMBS |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, Carrying Value | 35,532 | 159,841
Less Than 12 months, Gross Unrealized Losses | (22) | (4,526)
Greater Than 12 months, Carrying Value | 36,739 | 8,234
Greater Than 12 months, Gross Unrealized Losses | (53) | (848)
Total, Carrying Value | 72,271 | 168,075
Total Gross Unrealized Losses | (75) | $ (5,374)
CMBS |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, Carrying Value | 22,504 |
Less Than 12 months, Gross Unrealized Losses | (365) |
Greater Than 12 months, Carrying Value | 0 |
Greater Than 12 months, Gross Unrealized Losses | 0 |
Total, Carrying Value | 22,504 |
Total Gross Unrealized Losses | $ (365) |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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