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Investment Securities Available for Sale, at Fair Value - Schedule of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value Option |  |
Amortized Cost | $ 294,720 | $ 412,164
Unrealized Gains | 19,449 | 15,795
Unrealized Losses | (6,673) | (14,517)
Fair Value | 307,496 | 413,442
CECL Securities |  |
Amortized Cost | 138,555 | 310,290
Unrealized Gains | 2,482 | 6,368
Unrealized Losses | (440) | (5,374)
Fair Value | 140,597 | 311,284
Total CECL Securities and Fair Value Option |  |
Amortized Cost | 433,275 | 722,454
Unrealized Gains | 21,931 | 22,163
Unrealized Losses | (7,113) | (19,891)
Fair Value | 448,093 | 724,726
Agency RMBS |  |
Fair Value Option |  |
Amortized Cost | 129,198 | 138,541
Unrealized Gains | 0 | 854
Unrealized Losses | (3,609) | 0
Fair Value | 125,589 | 139,395
Non-Agency RMBS |  |
Fair Value Option |  |
Amortized Cost | 108,579 | 100,465
Unrealized Gains | 1,168 | 170
Unrealized Losses | (3,064) | (10,786)
Fair Value | 106,683 | 89,849
CECL Securities |  |
Amortized Cost | 115,686 | 266,855
Unrealized Gains | 2,482 | 4,336
Unrealized Losses | (75) | (5,374)
Fair Value | 118,093 | 265,817
Non-Agency RMBS | Non Agency RMBS Held In Securitization Trust |  |
Fair Value Option |  |
Fair Value |  | 37,600
CECL Securities |  |
Amortized Cost |  | 71,500
CMBS |  |
Fair Value Option |  |
Amortized Cost | 32,600 | 139,019
Unrealized Gains | 1,139 | 5,685
Unrealized Losses | 0 | (3,731)
Fair Value | 33,739 | 140,973
CECL Securities |  |
Amortized Cost | 22,869 | 43,435
Unrealized Gains | 0 | 2,032
Unrealized Losses | (365) | 0
Fair Value | 22,504 | 45,467
ABS |  |
Fair Value Option |  |
Amortized Cost | 24,343 | 34,139
Unrealized Gains | 17,142 | 9,086
Unrealized Losses | 0 | 0
Fair Value | $ 41,485 | $ 43,225

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