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Investment Securities Available for Sale, at Fair Value - Schedule of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value Option |  |
Amortized Cost | $ 723,851 | $ 81,788
Unrealized Gains | 8,847 | 9,495
Unrealized Losses | (22,377) | (15,369)
Fair Value | 710,321 | 75,914
CECL Securities |  |
Amortized Cost | 25,713 | 25,616
Unrealized Gains | 0 | 0
Unrealized Losses | (1,762) | (1,971)
Fair Value | 23,951 | 23,645
Total CECL Securities and Fair Value Option |  |
Amortized Cost | 749,564 | 107,404
Unrealized Gains | 8,847 | 9,495
Unrealized Losses | (24,139) | (17,340)
Fair Value | 734,272 | 99,559
Agency RMBS |  |
Fair Value Option |  |
Amortized Cost | 648,027 | 0
Unrealized Gains | 0 | 0
Unrealized Losses | (7,894) | 0
Fair Value | 640,133 | 0
Non-Agency RMBS |  |
Fair Value Option |  |
Amortized Cost | 43,808 | 48,958
Unrealized Gains | 8,847 | 9,436
Unrealized Losses | (12,864) | (13,469)
Fair Value | 39,791 | 44,925
CECL Securities |  |
Amortized Cost | 25,713 | 25,616
Unrealized Gains | 0 | 0
Unrealized Losses | (1,762) | (1,971)
Fair Value | 23,951 | 23,645
CMBS |  |
Fair Value Option |  |
Amortized Cost | 32,016 | 32,033
Unrealized Gains | 0 | 0
Unrealized Losses | (1,619) | (1,900)
Fair Value | 30,397 | 30,133
ABS |  |
Fair Value Option |  |
Amortized Cost | 0 | 797
Unrealized Gains | 0 | 59
Unrealized Losses | 0 | 0
Fair Value | $ 0 | $ 856

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