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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, 2020 | Mar. 31, 2019
Debt Securities, Available-for-sale [Line Items] |  |
Sales Proceeds | $ 1,383,390 |
Sales Proceeds | 1,380,980 | $ 56,769
Realized Gains | 11,058 | 16,957
Realized Losses | (69,795) | (156)
Net Realized Gains/Losses | (58,737) | 16,801
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 | 130,948 |
Realized Gains | 0 |
Realized Losses | (24,132) |
Net Realized Gains/Losses | (24,132) |
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Sales Proceeds | 114,038 |
Sales Proceeds |  | 56,769
Realized Gains | 0 | 16,957
Realized Losses | (29,584) | (156)
Net Realized Gains/Losses | $ (29,584) | $ 16,801

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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=118939692&loc=d3e27357-111563 + Details
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