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Investment Securities Available for Sale, at Fair Value - Schedule of Available for Sale Securities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Mar. 31, 2020
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | $ 1,735,680 | $ 559,563
Unrealized Gains | 32,723 | 0
Unrealized Losses | (7,591) | (117,031)
Fair Value | 1,760,812 | 442,532
Agency RMBS |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 901,943 | 0
Unrealized Gains | 7,410 | 0
Unrealized Losses | (7,454) | 0
Fair Value | 901,899 | 0
Agency CMBS |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 20,258 | 0
Unrealized Gains | 19 | 0
Unrealized Losses | 0 | 0
Fair Value | 20,277 | 0
Total Agency |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 922,201 | 0
Unrealized Gains | 7,429 | 0
Unrealized Losses | (7,454) | 0
Fair Value | 922,176 | 0
Non-Agency RMBS |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 578,955 | 474,192
Unrealized Gains | 12,557 | 0
Unrealized Losses | (13) | (102,729)
Fair Value | 591,499 | 371,463
CMBS |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 234,524 | 85,371
Unrealized Gains | 12,737 | 0
Unrealized Losses | (124) | (14,302)
Fair Value | 247,137 | 71,069
Agency ARMs | Agency RMBS |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 55,740 | 0
Unrealized Gains | 13 | 0
Unrealized Losses | (1,347) | 0
Fair Value | $ 54,406 | 0
Weighted average reset period | 26 months |
Agency Fixed- Rate | Agency RMBS |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | $ 846,203 | 0
Unrealized Gains | 7,397 | 0
Unrealized Losses | (6,107) | 0
Fair Value | $ 847,493 | $ 0

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