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Investment Securities Available For Sale, at Fair Value - Summary (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Fair Value Option |  |
Amortized Cost | $ 81,788 | $ 154,581
Unrealized Gains | 9,495 | 19,517
Unrealized Losses | (15,369) | (2,774)
Fair Value | 75,914 | 171,324
CECL Securities |  |
Amortized Cost | 25,616 | 27,743
Unrealized Gains | 0 | 1,787
Unrealized Losses | (1,971) | (10)
Fair Value | 23,645 | 29,520
Debt securities, available-for-sale, CECL and fair value option, amortized cost | 107,404 | 182,324
Debt securities, available-for-sale, CECL and fair value option, accumulated gross unrealized gain, before tax | 9,495 | 21,304
Debt Securities, Available-For-Sale, CECL And Fair Value Option, Accumulated Gross Unrealized Loss, before Tax | (17,340) | (2,784)
Debt securities, available-for-sale, CECL and fair value option | 99,559 | 200,844
Non-Agency RMBS |  |
Fair Value Option |  |
Amortized Cost | 48,958 | 100,186
Unrealized Gains | 9,436 | 949
Unrealized Losses | (13,469) | (2,636)
Fair Value | 44,925 | 98,499
CECL Securities |  |
Amortized Cost | 25,616 | 27,743
Unrealized Gains | 0 | 1,787
Unrealized Losses | (1,971) | (10)
Fair Value | 23,645 | 29,520
CMBS |  |
Fair Value Option |  |
Amortized Cost | 32,033 | 32,600
Unrealized Gains | 0 | 684
Unrealized Losses | (1,900) | (138)
Fair Value | 30,133 | 33,146
ABS |  |
Fair Value Option |  |
Amortized Cost | 797 | 21,795
Unrealized Gains | 59 | 17,884
Unrealized Losses | 0 | 0
Fair Value | $ 856 | $ 39,679

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