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Subordinate Loans - Company's Subordinate Loan Portfolio (Details) (USD $) | 1 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 1 Months Ended
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Jan. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2012 | Dec. 31, 2012 Senior Mezz - Retail - Various | Dec. 31, 2012 Junior Mezz - Retail - Various | Sep. 30, 2013 Office - Michigan | Dec. 31, 2012 Office - Michigan | Sep. 30, 2013 Ski Resort - California | Dec. 31, 2012 Ski Resort - California | Sep. 30, 2013 Hotel Portfolio – New York option | Dec. 31, 2012 Hotel Portfolio – New York option | Sep. 30, 2013 Retail Center – Virginia option | Dec. 31, 2012 Retail Center – Virginia option | Sep. 30, 2013 Hotel– New York | Dec. 31, 2012 Hotel– New York | Dec. 31, 2012 Hotel– New York option | Sep. 30, 2013 Mixed Use – North Carolina | Dec. 31, 2012 Mixed Use – North Carolina | Sep. 30, 2013 Office Complex - Missouri | Dec. 31, 2012 Office Complex - Missouri | Sep. 30, 2013 Hotel Portfolio – Various | Dec. 31, 2012 Hotel Portfolio – Various | Sep. 30, 2013 Multifamily Conversion – NY, NY; One-year Extension Option | Sep. 30, 2013 Hotel Portfolio – Rochester, MN | Sep. 30, 2013 Condo Conversion – NY, NY option | Dec. 31, 2012 Condo Conversion – NY, NY | Sep. 30, 2013 Condo Construction - NY, NY | Dec. 31, 2012 Condo Construction - NY, NY option | Sep. 30, 2013 Warehouse Portfolio - Various | Sep. 30, 2013 Multifamily Conversion – NY, NY; Three-month Extension Option | Sep. 30, 2013 Office Condo - NY, NY [Member] | Sep. 30, 2013 Condo Conversion - NY, NY | Sep. 30, 2013 Mixed Use - Pittsburgh, PN [Member] option | Jun. 30, 2013 Mezzanine loans [Member] | Feb. 28, 2013 Mezzanine loans [Member] loan
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Date of Investment |  |  |  | Dec-09 | Dec-09 | May-10 | May-10 | Apr-11 | Apr-11 | Aug-11 | [1] | Aug-11 | Oct-11 | [2] | Oct-11 | Jan-12 | [3] | Jan-12 | Mar-12 | Jul-12 | Jul-12 | Sept-12 | Sept-12 | Nov-12 | [4] | Nov-12 | Jan-13 | [5] | Jan-13 | Dec-12 | [6] | Dec-12 | Jan-13 | [7] |  | May-13 | May-13 | [8] | Jul-13 |  | Aug-13 |  | Aug-13 |  |  |
Maturity Date |  |  |  | Dec-19 | Dec-19 | Jun-20 | Jun-20 | May-17 | May-17 | July-14 | [1] | July-13 | Oct-14 | [2] | Oct-14 | Feb-14 | [3] | Feb-14 | Mar-14 | Jul-22 | Jul-22 | Oct-22 | Oct-22 | Nov-15 | [4] | Nov-15 | Dec-14 | [5] | Feb-18 | Jan-15 | [6] | Jan-15 | Jul-17 | [7] |  | May-23 | Jun-14 | [8] | Jul-22 |  | Sept-15 |  | Aug-16 |  |  |
Original Face Amount |  | $ 396,669,000 | $ 245,875,000 | $ 30,000,000 | $ 20,000,000 | $ 9,000,000 | $ 9,000,000 | $ 40,000,000 | $ 40,000,000 | $ 25,000,000 | [1] | $ 25,000,000 | $ 25,000,000 | [2] | $ 25,000,000 | $ 15,000,000 | [3] | $ 15,000,000 | $ 15,000,000 | $ 6,525,000 | $ 6,525,000 | $ 10,000,000 | $ 10,000,000 | $ 50,000,000 | [4] | $ 50,000,000 | $ 18,000,000 | [5] | $ 25,000,000 | $ 350,000 | [6] | $ 350,000 | $ 60,000,000 | [7] |  | $ 32,000,000 | $ 44,000,000 | [8] | $ 14,000,000 | [8] | $ 294,000 | [8] | $ 22,500,000 | [8] |  |
Current Face Amount |  | 396,796,000 | 246,959,000 | 30,000,000 | 20,000,000 | 8,879,000 | 8,912,000 | 40,000,000 | 40,000,000 | 25,000,000 | [1] | 25,000,000 | 22,216,000 | [2] | 26,243,000 | 15,000,000 | [3] | 15,000,000 | 15,000,000 | 6,525,000 | 6,525,000 | 9,883,000 | 9,979,000 | 48,697,000 | [4] | 49,950,000 | 18,000,000 | [5] | 24,840,000 | 350,000 | [6] | 350,000 | 64,612,000 | [7] |  | 32,000,000 | 44,000,000 | [8] | 14,000,000 | [8] | 294,000 | [8] | 22,500,000 | [8] |  |
Carrying Value |  | 394,554,000 | 246,246,000 | 30,000,000 | 20,000,000 | 8,879,000 | 8,912,000 | 39,812,000 | 39,831,000 | 25,000,000 | [1] | 25,000,000 | 22,216,000 | [2] | 26,243,000 | 15,156,000 | [3] | 15,013,000 | 15,000,000 | 6,525,000 | 6,525,000 | 9,883,000 | 9,979,000 | 48,616,000 | [4] | 49,743,000 | 17,889,000 | [5] | 24,840,000 |  | [6] |  | 64,094,000 | [7] |  | 32,000,000 | 43,781,000 | [8] | 13,557,000 | [8] |  | [8] | 22,306,000 | [8] |  |
Coupon |  |  |  | Fixed | Fixed | Fixed | Fixed | Fixed | Fixed | Floating | [1] | Floating | Fixed | [2] | Fixed | Fixed | [3] | Fixed | Floating | Fixed | Fixed | Fixed | Fixed | Floating | [4] | Floating | Floating | [5] | Fixed | Floating | [6] | Floating | Fixed | [7] |  | Fixed | Floating | [8] | Fixed |  | Floating |  | Floating |  |  |
Coupon |  | 12.04% | 12.46% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options to extend loan agreement |  |  |  |  |  |  |  |  |  | 2 |  | 3 | 2 |  | 2 |  |  | 2 | 2 |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  | 2 |  |  |  |  |  |  |  | 2 |  |  |
Option to extend loan agreement, term |  |  |  |  |  |  |  |  |  | 1 year |  | 1 year | 1 year |  | 1 year | 1 year |  | 1 year | 1 year |  |  |  |  |  |  | 1 year |  |  |  | 1 year |  |  |  |  | 1 year |  | 3 months |  |  |  | 1 year |  | 1 year |  |  |
Unfunded loan commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,650,000 |  |  |  |  | 34,650,000 |  |  |  |  |  | 29,106,000 |  |  |  |  |
Number of loans for which principal amount received |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2
Principal Prepayment On Mortgage Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 | 50,000,000
Yield maintenance payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,233,000 | $ 2,500,000
IRR on loan investment | 17.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19.00% | 15.00%
[1] | Includes two one-year extension options subject to certain conditions and the payment of a fee for the fourth and fifth year extensions.
[2] | Includes two one-year extension options subject to certain conditions.
[3] | Includes a one-year extension option subject to certain conditions and the payment of an extension fee.
[4] | (4)Includes two one-year extension options subject to certain conditions and the payment of a fee for each extension. As of September 30, 2013, the Company had $34,650 of unfunded loan commitments related to this loan.
[5] | (7)Includes two one-year extension options subject to certain conditions and the payment of a fee for each extension.
[6] | Includes two one-year extension options subject to certain conditions and the payment of a fee for each extension. As of September 30, 2013, the Company had $34,650 of unfunded loan commitments related to this loan.
[7] | (6)Includes a one-year extension option subject to certain conditions and the payment of an extension fee. As of September 30, 2013, the Company had $29,106 of unfunded loan commitments related to this loan.
[8] | Includes a three-month extension option subject to certain conditions and the payment of an extension fee.

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