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Investment Securities Available for Sale, at Fair Value - Schedule of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
Fair Value Option |  |  |
Amortized Cost | $ 364,268 | $ 412,164 |
Unrealized Gains | 15,022 | 15,795 |
Unrealized Losses | (15,585) | (14,517) |
Fair Value | 363,705 | 413,442 |
CECL Securities |  |  |
Amortized Cost | 228,716 | 310,290 |
Unrealized Gains | 5,138 | 6,368 |
Unrealized Losses | (1,264) | (5,374) |
Fair Value | 232,590 | 311,284 |
Total CECL Securities and Fair Value Option |  |  |
Amortized Cost | 592,984 | 722,454 |
Unrealized Gains | 20,160 | 22,163 |
Unrealized Losses | (16,849) | (19,891) |
Fair Value | 596,295 | 724,726 |
Consolidated K-Series | VIE, Primary Beneficiary |  |  |
Total CECL Securities and Fair Value Option |  |  |
IOs and mezzanine securities transferred to available-for-sale securities from consolidated K-series due to de-consolidation |  |  | $ 237,300
Agency RMBS |  |  |
Fair Value Option |  |  |
Amortized Cost | 136,491 | 138,541 |
Unrealized Gains | 0 | 854 |
Unrealized Losses | (4,866) | 0 |
Fair Value | 131,625 | 139,395 |
Non-Agency RMBS |  |  |
Fair Value Option |  |  |
Amortized Cost | 81,451 | 100,465 |
Unrealized Gains | 425 | 170 |
Unrealized Losses | (10,043) | (10,786) |
Fair Value | 71,833 | 89,849 |
CECL Securities |  |  |
Amortized Cost | 196,933 | 266,855 |
Unrealized Gains | 3,708 | 4,336 |
Unrealized Losses | (867) | (5,374) |
Fair Value | 199,774 | 265,817 |
Non-Agency RMBS | Non Agency RMBS Held In Securitization Trust |  |  |
Fair Value Option |  |  |
Fair Value |  | 37,600 |
CECL Securities |  |  |
Fair Value |  | 71,500 |
CMBS |  |  |
Fair Value Option |  |  |
Amortized Cost | 114,177 | 139,019 |
Unrealized Gains | 2,124 | 5,685 |
Unrealized Losses | (676) | (3,731) |
Fair Value | 115,625 | 140,973 |
CECL Securities |  |  |
Amortized Cost | 31,783 | 43,435 |
Unrealized Gains | 1,430 | 2,032 |
Unrealized Losses | (397) | 0 |
Fair Value | 32,816 | 45,467 |
CMBS | Consolidated K-Series | VIE, Primary Beneficiary |  |  |
Total CECL Securities and Fair Value Option |  |  |
IOs and mezzanine securities transferred to available-for-sale securities from consolidated K-series due to de-consolidation | 74,000 | 97,600 |
ABS |  |  |
Fair Value Option |  |  |
Amortized Cost | 32,149 | 34,139 |
Unrealized Gains | 12,473 | 9,086 |
Unrealized Losses | 0 | 0 |
Fair Value | $ 44,622 | $ 43,225 |

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