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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, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Carrying Value Less Than 12 Months | $ 269,352 | $ 25,507
Gross Unrealized Losses Less Than 12 Months | (12,287) | (124)
Carrying Value Greater Than 12 Months | 16,966 | 222,390
Gross Unrealized Losses Greater Than 12 Months | (1,337) | (7,467)
Carrying Value | 286,318 | 247,897
Gross Unrealized Losses | (13,624) | (7,591)
Agency RMBS |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Carrying Value Less Than 12 Months |  | 0
Gross Unrealized Losses Less Than 12 Months |  | 0
Carrying Value Greater Than 12 Months |  | 222,286
Gross Unrealized Losses Greater Than 12 Months |  | (7,454)
Carrying Value |  | 222,286
Gross Unrealized Losses |  | (7,454)
Non-Agency RMBS |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Carrying Value Less Than 12 Months | 235,449 | 0
Gross Unrealized Losses Less Than 12 Months | (11,651) | 0
Carrying Value Greater Than 12 Months | 16,966 | 104
Gross Unrealized Losses Greater Than 12 Months | (1,337) | (13)
Carrying Value | 252,415 | 104
Gross Unrealized Losses | (12,988) | (13)
CMBS |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Carrying Value Less Than 12 Months | 33,903 | 25,507
Gross Unrealized Losses Less Than 12 Months | (636) | (124)
Carrying Value Greater Than 12 Months | 0 | 0
Gross Unrealized Losses Greater Than 12 Months | 0 | 0
Carrying Value | 33,903 | 25,507
Gross Unrealized Losses | $ (636) | $ (124)

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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=121582814&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=121645371&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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