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Securities, at Fair Value (Sale of MBS) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Sales Proceeds | $ 0 | $ 116 | $ 0 | $ 3,062,858
Gains/(Losses) | 0 | 48 | 0 | 61,697
Agency MBS |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Sales Proceeds | 0 | 0 | 0 | 1,500,875
Gains/(Losses) | 0 | 0 | 0 | (19,291)
Non-Agency MBS |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Sales Proceeds | 0 | 116 | 0 | 1,318,958
Gains/(Losses) | 0 | 48 | 0 | 107,999
CRT securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Sales Proceeds | 0 | 0 | 0 | 243,025
Gains/(Losses) | $ 0 | $ 0 | $ 0 | $ (27,011)

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- Definition Net gain (loss) resulting from the sales of securitized, pay-through debt securities collateralized by real estate mortgage loans (mortgages). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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- Definition Amount of cash inflow from sale of investment in mortgage-backed security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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