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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, 2021 | Dec. 31, 2020
Fair Value Option |  |
Amortized Cost | $ 154,581 | $ 412,164
Unrealized Gains | 19,517 | 15,795
Unrealized Losses | (2,774) | (14,517)
Fair Value | 171,324 | 413,442
CECL Securities |  |
Amortized Cost | 27,743 | 310,290
Unrealized Gains | 1,787 | 6,368
Unrealized Losses | (10) | (5,374)
Fair Value | 29,520 | 311,284
Debt securities, available-for-sale, CECL and fair value option, amortized cost | 182,324 | 722,454
Debt securities, available-for-sale, CECL and fair value option, accumulated gross unrealized gain, before tax | 21,304 | 22,163
Debt Securities, Available-For-Sale, CECL And Fair Value Option, Accumulated Gross Unrealized Loss, before Tax | (2,784) | (19,891)
Debt securities, available-for-sale, CECL and fair value option | 200,844 | 724,726
Debt securities, available-for-sale, amortized cost, excluding accrued interest, before allowance for credit loss | 27,743 | 310,290
Agency RMBS |  |
Fair Value Option |  |
Amortized Cost | 0 | 138,541
Unrealized Gains | 0 | 854
Unrealized Losses | 0 | 0
Fair Value | 0 | 139,395
Non-Agency RMBS |  |
Fair Value Option |  |
Amortized Cost | 100,186 | 100,465
Unrealized Gains | 949 | 170
Unrealized Losses | (2,636) | (10,786)
Fair Value | 98,499 | 89,849
CECL Securities |  |
Amortized Cost | 27,743 | 266,855
Unrealized Gains | 1,787 | 4,336
Unrealized Losses | (10) | (5,374)
Fair Value | 29,520 | 265,817
Debt securities, available-for-sale, amortized cost, excluding accrued interest, before allowance for credit loss | 27,743 | 266,855
Non-Agency RMBS | Non Agency RMBS Held In Securitization Trust |  |
Fair Value Option |  |
Fair Value |  | 37,600
CECL Securities |  |
Amortized Cost |  | 71,500
Debt securities, available-for-sale, amortized cost, excluding accrued interest, before allowance for credit loss |  | 71,500
CMBS |  |
Fair Value Option |  |
Amortized Cost | 32,600 | 139,019
Unrealized Gains | 684 | 5,685
Unrealized Losses | (138) | (3,731)
Fair Value | 33,146 | 140,973
CECL Securities |  |
Amortized Cost | 0 | 43,435
Unrealized Gains | 0 | 2,032
Unrealized Losses | 0 | 0
Fair Value | 0 | 45,467
Debt securities, available-for-sale, amortized cost, excluding accrued interest, before allowance for credit loss | 0 | 43,435
ABS |  |
Fair Value Option |  |
Amortized Cost | 21,795 | 34,139
Unrealized Gains | 17,884 | 9,086
Unrealized Losses | 0 | 0
Fair Value | $ 39,679 | $ 43,225

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