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Real Estate Securities - Additional Information (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) Investment | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) Investment | Sep. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) Investment
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |
Net unrealized gain (loss) on available-for-sale securities | $ 7,373,000 | $ (3,921,000) | $ 17,083,000 | $ 398,000 |  |
Number of AFS securities (in investments) | Investment | 88 |  | 88 |  |  | 66
Number of securities in unrealized loss position | Investment | 14 |  | 14 |  |  | 21
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer (in investments) | Investment | 11 |  | 11 |  |  | 19
Allowance for credit loss | $ 867,000 |  | $ 867,000 |  | $ 1,339,000 | $ 2,482,000
Sales |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |
Gross realized gains |  |  | 0 | $ 2,000,000 |  |
Residential |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |
AFS securities, contractual maturities, less than five years | 46,000,000 |  | 46,000,000 |  |  |
Marketable securities, due from five to ten years | $ 5,000,000 |  | $ 5,000,000 |  |  |

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 + Details
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