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Mortgage-Backed Securities (Tables) | 6 Months Ended
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Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract] |
Debt Securities, Available-for-sale [Table Text Block] | The following tables present the Company’s MBS by investment type as of the dates indicated:
| June 30, 2021
| Agency RMBS |  | Agency CMBS |  | CMBS IO (1) |  | Non-Agency Other |  | Total
MBS designated as AFS: |  |  |  |  |  |  |  |  |
Par value | $ | 1,347,318 |  |  | $ | 196,093 |  |  | $ | — |  |  | $ | 1,196 |  |  | $ | 1,544,607 |
Unamortized premium (discount) | 44,344 |  |  | 2,725 |  |  | 326,572 |  |  | (306) |  |  | 373,335 |
Amortized cost | 1,391,662 |  |  | 198,818 |  |  | 326,572 |  |  | 890 |  |  | 1,917,942 |
Gross unrealized gain | 10,022 |  |  | 12,300 |  |  | 16,155 |  |  | 152 |  |  | 38,629 |
Gross unrealized loss | (8,420) |  |  | (8) |  |  | (786) |  |  | (41) |  |  | (9,255) |
Fair value | 1,393,264 |  |  | 211,110 |  |  | 341,941 |  |  | 1,001 |  |  | 1,947,316 |
MBS measured at fair value through net income: |  |  |  |  |  |  |  |
Par value | $ | 1,013,404 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1,013,404 |
Unamortized premium | 34,219 |  |  | — |  |  | 526 |  |  | — |  |  | 34,745 |
Amortized cost | 1,047,623 |  |  | — |  |  | 526 |  |  | — |  |  | 1,048,149 |
Gross unrealized gain | 451 |  |  | — |  |  | 16 |  |  | — |  |  | 467 |
Gross unrealized loss | (430) |  |  | — |  |  | — |  |  | — |  |  | (430) |
Fair value | 1,047,644 |  |  | — |  |  | 542 |  |  | — |  |  | 1,048,186 |
Total as of June 30, 2021 | $ | 2,440,908 |  |  | $ | 211,110 |  |  | $ | 342,483 |  |  | $ | 1,001 |  |  | $ | 2,995,502 |
(1) The notional balance for Agency CMBS IO and non-Agency CMBS IO was $10,868,346 and $8,984,509 respectively, as of June 30, 2021.
| December 31, 2020
| Agency RMBS |  | Agency CMBS |  | CMBS IO (1) |  | Non-Agency Other |  | Total
MBS designated as AFS: |  |  |  |  |  |  |  |  |
Par value | $ | 1,839,046 |  |  | $ | 235,801 |  |  | $ | — |  |  | $ | 1,499 |  |  | $ | 2,076,346 |
Unamortized premium (discount) | 57,997 |  |  | 3,152 |  |  | 378,940 |  |  | (440) |  |  | 439,649 |
Amortized cost | 1,897,043 |  |  | 238,953 |  |  | 378,940 |  |  | 1,059 |  |  | 2,515,995 |
Gross unrealized gain | 49,348 |  |  | 19,597 |  |  | 12,081 |  |  | 267 |  |  | 81,293 |
Gross unrealized loss | — |  |  | — |  |  | (982) |  |  | (51) |  |  | (1,033) |
Fair value | 1,946,391 |  |  | 258,550 |  |  | 390,039 |  |  | 1,275 |  |  | 2,596,255 |
MBS measured at fair value through net income: |  |  |  |  |  |  |  |
Par value | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Unamortized premium | — |  |  | — |  |  | — |  |  | — |  |  | — |
Amortized cost | — |  |  | — |  |  | — |  |  | — |  |  | — |
Gross unrealized gain | — |  |  | — |  |  | — |  |  | — |  |  | — |
Gross unrealized loss | — |  |  | — |  |  | — |  |  | — |  |  | — |
Fair value | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total as of December 31, 2020 | $ | 1,946,391 |  |  | $ | 258,550 |  |  | $ | 390,039 |  |  | $ | 1,275 |  |  | $ | 2,596,255 |
(1) The notional balance for the Agency CMBS IO and non-Agency CMBS IO was $11,277,908 and $9,319,520, respectively, as of December 31, 2020.
Schedule of Realized Gain (Loss) [Table Text Block] | The following table presents information regarding the "realized gain on sale of investments, net" on the Company’s consolidated statements of comprehensive income (loss) for the periods indicated:
| Three Months Ended
| June 30,
| 2021 |  | 2020
| Proceeds Received |  | Realized Gain (Loss) |  | Proceeds Received |  | Realized Gain
Agency RMBS-designated as AFS | $ | 212,580 |  |  | $ | (759) |  |  | $ | 371,106 |  |  | $ | 11,729 |
Agency CMBS-designated as AFS | 37,873 |  |  | 2,767 |  |  | 2,020,228 |  |  | 181,370 |
| $ | 250,453 |  |  | $ | 2,008 |  |  | $ | 2,391,334 |  |  | $ | 193,099 |
| Six Months Ended
| June 30,
| 2021 |  | 2020
| Proceeds Received |  | Realized Gain |  | Proceeds Received |  | Realized Gain
Agency RMBS-designated as AFS | $ | 287,409 |  |  | $ | 3,938 |  |  | $ | 2,188,456 |  |  | $ | 75,823 |
Agency CMBS-designated as AFS | 37,873 |  |  | 2,767 |  |  | 2,193,912 |  |  | 202,059 |
| $ | 325,282 |  |  | $ | 6,705 |  |  | $ | 4,382,368 |  |  | $ | 277,882 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block] | The following table presents certain information for the AFS securities in an unrealized loss position as of the dates indicated:
| June 30, 2021 |  | December 31, 2020
| Fair Value |  | Gross Unrealized Losses |  | # of Securities |  | Fair Value |  | Gross Unrealized Losses |  | # of Securities
Continuous unrealized loss position for less than 12 months: |  |  |  |  |  |  |  |  |  |  |
Agency MBS | $ | 1,961,980 |  |  | $ | (9,212) |  |  | 34 |  | $ | 19,266 |  |  | $ | (399) |  |  | 19
Non-Agency MBS | 4,996 |  |  | (203) |  |  | 5 |  | 33,417 |  |  | (408) |  |  | 23
Continuous unrealized loss position for 12 months or longer: |  |  |  |  |  |  |  |  |  |  |
Agency MBS | $ | 324 |  |  | $ | (121) |  |  | 5 |  | $ | 749 |  |  | $ | (133) |  |  | 2
Non-Agency MBS | 3,333 |  |  | (149) |  |  | 7 |  | 2,156 |  |  | (93) |  |  | 5

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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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