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Investment Securities Available For Sale, at Fair Value - Unrealized Losses in OCI (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Carrying Value | $ 159,841 | $ 25,507
Less than 12 Months, Gross Unrealized Losses | (4,526) | (124)
Greater than 12 Months, Carrying Value | 8,234 | 222,390
Greater than 12 Months, Gross Unrealized Losses | (848) | (7,467)
Total, Carrying Value | 168,075 | 247,897
Total, Gross Unrealized Losses | (5,374) | (7,591)
Agency RMBs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Carrying Value |  | 0
Less than 12 Months, Gross Unrealized Losses |  | 0
Greater than 12 Months, Carrying Value |  | 222,286
Greater than 12 Months, Gross Unrealized Losses |  | (7,454)
Total, Carrying Value |  | 222,286
Total, Gross Unrealized Losses |  | (7,454)
Non-Agency RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Carrying Value | 159,841 | 0
Less than 12 Months, Gross Unrealized Losses | (4,526) | 0
Greater than 12 Months, Carrying Value | 8,234 | 104
Greater than 12 Months, Gross Unrealized Losses | (848) | (13)
Total, Carrying Value | 168,075 | 104
Total, Gross Unrealized Losses | $ (5,374) | (13)
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Carrying Value |  | 25,507
Less than 12 Months, Gross Unrealized Losses |  | (124)
Greater than 12 Months, Carrying Value |  | 0
Greater than 12 Months, Gross Unrealized Losses |  | 0
Total, Carrying Value |  | 25,507
Total, Gross Unrealized Losses |  | $ (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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- 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=121645371&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=121582814&loc=SL82922890-210455 + Details
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