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Investment Securities Available For Sale, at Fair Value - Realized Gain or Loss Activity (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items] |  |  |
Sales Proceeds | $ 432,585 | $ 1,820,194 | $ 97,951
Realized Gains | 16,006 | 19,679 | 21,971
Realized Losses | (4,786) | (81,208) | (156)
Net Realized Gains (Losses) | 11,220 | (61,529) | 21,815
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) |
Agency RMBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sales Proceeds | 123,622 | 992,966 |
Realized Gains | 0 | 5,402 |
Realized Losses | (3,480) | (15,854) |
Net Realized Gains (Losses) | (3,480) | (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 |
Non-Agency RMBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sales Proceeds | 176,166 | 433,076 | 1,021
Realized Gains | 4,923 | 435 | 33
Realized Losses | (854) | (34,856) | 0
Net Realized Gains (Losses) | 4,069 | (34,421) | 33
Non-Agency RMBS | Non Agency RMBS Held In Securitization Trust |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Net Realized Gains (Losses) | (5,500) |  |
CMBS |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Sales Proceeds | 132,797 | 248,741 | 96,930
Realized Gains | 11,083 | 8,176 | 21,938
Realized Losses | (452) | (30,289) | (156)
Net Realized Gains (Losses) | $ 10,631 | $ (22,113) | $ 21,782

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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=123581744&loc=d3e27357-111563 + Details
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