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Related Party Transactions and Investments in Non-Consolidated Entities (Details 4) (USD $) | 9 Months Ended |  | 9 Months Ended | 0 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Sponsored REITs | Sep. 30, 2014 Secured revolving lines of credit FSP Highland Place I Corp. | Sep. 30, 2014 Secured revolving lines of credit FSP Satellite Place Corp. | Sep. 30, 2014 Secured revolving lines of credit FSP 1441 Main Street Corp. | Sep. 30, 2014 Secured revolving lines of credit FSP Energy Tower I Corp. | Sep. 30, 2014 Secured construction loan FSP 385 Interlocken Development Corp. | Jul. 03, 2014 Mortgage loan secured by property FSP Energy Tower I Corp. | Sep. 30, 2014 Mortgage loan secured by property FSP Energy Tower I Corp.
Sponsored REITs |  |  |  |  |  |  |  |  |  |  |
Term of sponsored REIT loan secured by mortgage, minimum |  |  |  | 2 years |  |  |  |  |  |  |
Term of sponsored REIT loan secured by mortgage, maximum |  |  |  | 3 years |  |  |  |  |  |  |
Extended term of sponsored REIT loan secured by mortgage, minimum |  |  |  | 1 year |  |  |  |  |  | 1 year |
Maximum amount of loan | $ 116,800,000 |  |  |  | $ 5,500,000 | $ 5,500,000 | $ 10,800,000 | $ 20,000,000 | $ 42,000,000 |  | $ 33,000,000
Amount Drawn | 88,436,000 |  | 99,746,000 |  | 3,395,000 | 5,500,000 | 9,000,000 |  | 37,541,000 |  | 33,000,000
Sponsored REIT loans, base rate |  |  |  |  | 30-day LIBOR | 30-day LIBOR | 30-day LIBOR | 30-day LIBOR | 30-day LIBOR |  |
Sponsored REIT loans, base rate margin (as a percent) |  |  |  |  | 4.40% | 4.40% | 4.40% | 5.00% | 4.40% |  |
Fixed rate of interest (as a percent) |  |  |  |  |  |  |  |  |  |  | 6.41%
Draw Fee (as a percent) |  |  |  |  | 0.50% | 0.50% | 0.50% | 0.50% |  |  |
Interest rate (as a percent) |  |  |  |  | 4.56% | 4.56% | 4.56% | 5.16% | 4.56% |  | 6.41%
Extension fee |  |  |  |  |  |  |  |  |  | 108,900 |
Interest income and fees from the Sponsored REIT Loans | $ 4,032,000 | $ 4,135,000 |  |  |  |  |  |  |  |  |

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- Definition Represents amount of extension fee on mortgage loans during the reporting period. + References No definition available. + Details
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Balance Type: | credit
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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 percentage of draw fee of each new advance given. + References No definition available. + Details
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- Definition Represents the percentage of fixed rate of interest on the loans receivable. + References No definition available. + Details
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- Definition Represents the minimum extended term of the sponsored REIT loan secured by mortgage. + References No definition available. + Details
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- Definition Stated maximum period for maturity of the mortgage loan receivable on real estate. + References No definition available. + Details
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- Definition Stated minimum period for maturity of the mortgage loan receivable on real estate. + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 9 + Details
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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(e)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph e -Article 9 + Details
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- Definition The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the loans receivable, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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