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Related Party Transactions and Investments in Non-Consolidated Entities - Sponsored REIT Loans outstanding (Details) - USD ($) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Oct. 29, 2021 | Oct. 28, 2021
Sponsored REITs |  |  |  |
Amount Drawn |  |  | $ 24,000,000 | $ 21,000,000
Related party mortgage loan receivable |  |  | 24,000,000 | $ 21,000,000
Sponsored REITs |  |  |  |
Sponsored REITs |  |  |  |
Interest income and fees from the Sponsored REIT Loans | $ 0 | $ 1,367,000 |  |
FSP Monument Circle LLC |  |  |  |
Sponsored REITs |  |  |  |
Additional loan amount |  |  | $ 3,000,000.0 |

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