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Investment Securities Available for Sale, at Fair Value - Schedule of Investment Securities Available for Sale-Fair Value Option (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized Cost | $ 533,307 | $ 244,735
Gains | 467 | 2,998
Losses | (88,998) | (2,405)
Fair Value | 444,776 | 245,328
VIE, Primary Beneficiary | Consolidated K-Series |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Securities owned, fair value | 237,300 |
Agency RMBS |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized Cost | 0 | 21,033
Gains | 0 | 0
Losses | 0 | (55)
Fair Value | 0 | 20,978
Agency CMBS |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized Cost | 0 | 31,076
Gains | 0 | 0
Losses | 0 | (395)
Fair Value | 0 | 30,681
Total Agency |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized Cost | 0 | 52,109
Gains | 0 | 0
Losses | 0 | (450)
Fair Value | 0 | 51,659
Non-Agency RMBS |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized Cost | 252,456 | 122,628
Gains | 467 | 2,435
Losses | (48,278) | (1,248)
Fair Value | 204,645 | 123,815
CMBS |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized Cost | 231,031 | 20,096
Gains | 0 | 563
Losses | (33,244) | (19)
Fair Value | 197,787 | 20,640
CMBS | VIE, Primary Beneficiary | Consolidated K-Series |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Securities owned, fair value | 124,200 |
ABS |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized Cost | 49,820 | 49,902
Gains | 0 | 0
Losses | (7,476) | (688)
Fair Value | 42,344 | 49,214
Agency Fixed- Rate | Agency RMBS |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Amortized Cost | 0 | 21,033
Gains | 0 | 0
Losses | 0 | (55)
Fair Value | $ 0 | $ 20,978

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