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Investment Securities Available for Sale, at Fair Value - Proceeds from Sale (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |
Sales Proceeds | $ 111,628 | $ 1,383,390
Realized Gains | 5,208 | 11,058
Realized Losses | (833) | (69,795)
Net Realized Gains (Losses) | 4,375 | (58,737)
Agency RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Sales Proceeds |  | 992,993
Realized Gains |  | 5,392
Realized Losses |  | (15,870)
Net Realized Gains (Losses) |  | (10,478)
Agency RMBS | Agency ARMs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Sales Proceeds |  | 49,893
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 |  | 943,100
Realized Gains |  | 5,348
Realized Losses |  | (11,713)
Net Realized Gains (Losses) |  | (6,365)
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 |  | 1,138,404
Realized Gains |  | 11,058
Realized Losses |  | (16,079)
Net Realized Gains (Losses) |  | (5,021)
Non-Agency RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Sales Proceeds | 72,083 | 130,948
Realized Gains | 12 | 0
Realized Losses | (833) | (24,132)
Net Realized Gains (Losses) | (821) | (24,132)
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Sales Proceeds | 39,545 | 114,038
Realized Gains | 5,196 | 0
Realized Losses | 0 | (29,584)
Net Realized Gains (Losses) | $ 5,196 | $ (29,584)

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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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- Definition Amount of realized gain (loss) 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/2009/role/commonPracticeRef -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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- Definition Amount of realized loss 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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