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Real Estate Securities - Components of Carrying Value (Which Equals Fair Value) of Residential Available for Sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
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Investments, Debt and Equity Securities [Abstract] |  |  |
Principal balance | $ 149,991 |  | $ 221,933
Credit reserve | (23,890) |  | (28,739)
Unamortized discount, net | (46,603) |  | (61,650)
Amortized cost | 79,498 |  | 131,544
Gross unrealized gains | 13,463 |  | 16,269
Gross unrealized losses | (8,984) |  | (13,127)
CECL allowance | (2,573) | $ (2,639) | (2,540)
Carrying Value | $ 81,404 |  | $ 132,146

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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