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Related Party Transactions and Investments in Non-Consolidated Entities - Sponsored REIT Loans outstanding (Details) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 06, 2020 | Dec. 31, 2021 USD ($) item | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Oct. 29, 2021 USD ($) | Oct. 28, 2021 USD ($) | Dec. 05, 2020
Sponsored REITs |  |  |  |  |  |  |
Maximum amount of loan |  | $ 24,000,000 |  |  |  |  |
Amount Drawn |  | 24,000,000 | $ 21,000,000 |  | $ 24,000,000 | $ 21,000,000 |
Interest income and fees from the Sponsored REIT Loans |  | 1,600,000 | 1,500,000 | $ 3,300,000 |  |  |
Related party mortgage loan receivable |  | $ 24,000,000 | $ 21,000,000 |  | 24,000,000 | $ 21,000,000 |
Number of additional commitments to lend | item |  | 0 |  |  |  |  |
Sponsored REITs |  |  |  |  |  |  |
Sponsored REITs |  |  |  |  |  |  |
Term of sponsored REIT loan secured by mortgage, minimum |  | 1 year |  |  |  |  |
Term of sponsored REIT loan secured by mortgage, maximum |  | 3 years |  |  |  |  |
FSP Monument Circle LLC |  |  |  |  |  |  |
Sponsored REITs |  |  |  |  |  |  |
Additional loan amount |  |  |  |  | $ 3,000,000.0 |  |
Mortgage loan | Sponsored REITs |  |  |  |  |  |  |
Sponsored REITs |  |  |  |  |  |  |
Interest rate (as a percent) | 7.51% |  |  |  |  |  | 7.19%
Mortgage Loan On Real Estate, Extended Term | 2 years |  |  |  |  |  |
Mortgage loan | Sponsored REITs | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Sponsored REITs |  |  |  |  |  |  |
Amount Drawn |  | $ 23,800,000 |  |  |  |  |
Related party mortgage loan receivable |  | 23,800,000 |  |  |  |  |
Mortgage loan | FSP Monument Circle LLC |  |  |  |  |  |  |
Sponsored REITs |  |  |  |  |  |  |
Maximum amount of loan |  | 24,000,000 |  |  |  |  |
Amount Drawn |  | $ 24,000,000 |  |  |  |  |
Interest rate (as a percent) |  | 7.51% |  |  |  |  |
Origination fee |  | $ 164,000 |  |  |  |  |
Exit fee |  | 38,000 |  |  |  |  |
Related party mortgage loan receivable |  | $ 24,000,000 |  |  |  |  |

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- Definition Reflects the additional amount of loan due from related parties at the balance sheet date. + References No definition available. + Details
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- Definition Extended term of mortgage loan on real estate, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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