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Investment Securities Available For Sale, at Fair Value - Realized Gain or Loss Activity (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] |  |  |
Sales Proceeds | $ 1,820,194 | $ 97,951 | $ 26,899
Realized Gains | 19,679 | 21,971 | 88
Realized Losses | (81,208) | (156) | (12,358)
Net Realized Gains (Losses) | (61,529) | 21,815 | (12,270)
Agency RMBS: |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sales Proceeds | 992,966 |  |
Realized Gains | 5,402 |  |
Realized Losses | (15,854) |  |
Net Realized Gains (Losses) | (10,452) |  |
Agency RMBS: | Agency ARMs |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sales Proceeds | 49,892 |  |
Realized Gains | 44 |  |
Realized Losses | (4,157) |  |
Net Realized Gains (Losses) | (4,113) |  |
Agency RMBS: | Agency Fixed Rate |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sales Proceeds | 943,074 |  |
Realized Gains | 5,358 |  |
Realized Losses | (11,697) |  |
Net Realized Gains (Losses) | (6,339) |  |
Agency CMBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sales Proceeds | 145,411 |  |
Realized Gains | 5,666 |  |
Realized Losses | (209) |  |
Net Realized Gains (Losses) | 5,457 |  |
Total Agency |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sales Proceeds | 1,138,377 |  |
Realized Gains | 11,068 |  |
Realized Losses | (16,063) |  |
Net Realized Gains (Losses) | (4,995) |  |
Non-Agency RMBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sales Proceeds | 433,076 | 1,021 |
Realized Gains | 435 | 33 |
Realized Losses | (34,856) | 0 |
Net Realized Gains (Losses) | (34,421) | 33 |
Non-Agency RMBS | Non Agency RMBS Held In Securitization Trust |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sales Proceeds | 67,600 |  |
Net Realized Gains (Losses) | 200 |  |
CMBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sales Proceeds | 248,741 | 96,930 |
Realized Gains | 8,176 | 21,938 |
Realized Losses | (30,289) | (156) |
Net Realized Gains (Losses) | $ (22,113) | $ 21,782 |
Agency IOs |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sales Proceeds |  |  | 26,899
Realized Gains |  |  | 88
Realized Losses |  |  | (12,358)
Net Realized Gains (Losses) |  |  | $ (12,270)

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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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