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Investment Securities Available for Sale, at Fair Value - Proceeds from Sale (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Sales Proceeds | $ 370,173,000 | $ 41,182,000 | $ 1,815,369,000 | $ 97,951,000
Realized Gains | 6,990,000 | 5,013,000 | 19,679,000 | 21,971,000
Realized Losses | (9,565,000) | 0 | (81,033,000) | (156,000)
Net Realized Gains (Losses) | (2,575,000) | 5,013,000 | (61,354,000) | 21,815,000
Agency RMBS |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Sales Proceeds |  |  | 992,966,000 |
Realized Gains |  |  | 5,402,000 |
Realized Losses |  |  | (15,854,000) |
Net Realized Gains (Losses) |  |  | (10,452,000) |
Agency RMBS | Agency ARMs |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Sales Proceeds |  |  | 49,892,000 |
Realized Gains |  |  | 44,000 |
Realized Losses |  |  | (4,157,000) |
Net Realized Gains (Losses) |  |  | (4,113,000) |
Agency RMBS | Agency Fixed- Rate |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Sales Proceeds |  |  | 943,074,000 |
Realized Gains |  |  | 5,358,000 |
Realized Losses |  |  | (11,697,000) |
Net Realized Gains (Losses) |  |  | (6,339,000) |
Agency CMBS |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Sales Proceeds |  |  | 145,411,000 |
Realized Gains |  |  | 5,666,000 |
Realized Losses |  |  | (209,000) |
Net Realized Gains (Losses) |  |  | 5,457,000 |
Total Agency |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Sales Proceeds |  |  | 1,138,377,000 |
Realized Gains |  |  | 11,068,000 |
Realized Losses |  |  | (16,063,000) |
Net Realized Gains (Losses) |  |  | (4,995,000) |
Non-Agency RMBS |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Sales Proceeds | 259,493,000 | 1,021,000 | 428,251,000 | 1,021,000
Realized Gains | 141,000 | 33,000 | 435,000 | 33,000
Realized Losses | (8,860,000) | 0 | (34,681,000) | 0
Net Realized Gains (Losses) | (8,719,000) |  | (34,246,000) |
Non-Agency RMBS | Non-Agency RMBS Held in Securitization Trust |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Sales Proceeds | 40,400,000 |  | 67,600,000 |
Net Realized Gains (Losses) | 26,100 |  | 200,000 |
CMBS |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Sales Proceeds | 110,680,000 | 40,161,000 | 248,741,000 | 96,930,000
Realized Gains | 6,849,000 | 4,980,000 | 8,176,000 | 21,938,000
Realized Losses | (705,000) | 0 | (30,289,000) | (156,000)
Net Realized Gains (Losses) | $ 6,144,000 | $ 4,980,000 | $ (22,113,000) | $ 21,782,000

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- Definition Proceeds Including Receivable For Unsettled Trades From Sale of Debt Securities, Available-for-sale + References No definition available. + Details
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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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