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Related Party Transactions and Investments in Non-Consolidated Entities - Sponsored REIT Loans outstanding (Details) - USD ($)	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Oct. 29, 2021	Oct. 28, 2021
Sponsored REITs
Maximum amount of loan	$ 24,000,000
Amount Drawn	24,000,000		$ 24,000,000	$ 21,000,000
Related party mortgage loan receivable	24,000,000		24,000,000	$ 21,000,000
Sponsored REITs
Sponsored REITs
Interest income and fees from the Sponsored REIT Loans	1,367,000	$ 1,196,000
FSP Monument Circle LLC
Sponsored REITs
Additional loan amount			$ 3,000,000.0
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

X

- 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

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

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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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 https://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.

+ References

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 https://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(e))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

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- Definition

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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