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Related Party Transactions and Investments in Non-Consolidated Entities - Sponsored REIT Loans outstanding (Details) - USD ($)		9 Months Ended
	Dec. 06, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 05, 2020
Sponsored REITs
Maximum amount of loan		$ 21,000,000
Amount Drawn		21,000,000		$ 21,000,000
Related party mortgage loan receivable		$ 21,000,000		$ 21,000,000
Sponsored REITs
Sponsored REITs
Term of sponsored REIT loan secured by mortgage, maximum		2 years
Interest income and fees from the Sponsored REIT Loans		$ 1,196,000	$ 1,149,000
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		20,500,000
Related party mortgage loan receivable		20,500,000
Mortgage loan | FSP Monument Circle LLC
Sponsored REITs
Maximum amount of loan		21,000,000
Amount Drawn		$ 21,000,000
Interest rate (as a percent)		7.51%
Origination fee		$ 164,000
Exit fee		38,000
Related party mortgage loan receivable		$ 21,000,000

X

- Definition

Reflects the maximum 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.

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- Definition

Stated maximum period for maturity of the mortgage loan receivable on real estate.

+ References

No definition available.

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- Definition

Represents the exit fee to be paid by the borrowed when repayment is made.

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No definition available.

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- Definition

The interest rate of the mortgage loan receivable at the end of the period.

+ References

No definition available.

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- Definition

Interest and fee income related to commercial loans including industrial and agricultural, real estate (commercial and residential, construction and development), trade financing, and lease financing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.1)
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

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- Definition

Expenses paid for obtaining loans which includes expenses such as application and origination fees.

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No definition available.

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- Definition

For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 942
-SubTopic 210
-Section S99
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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