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Subordinate Loan Portfolio (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | $ 2,720,344 |
Carrying amount of loans | 2,693,092 |
Subordinate Mortgage Portfolio Segment [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 1,061,229 | $ 939,006
Carrying amount of loans | 1,051,236 | 931,351
Unfunded Commitment | 55,387 | 54,423
Subordinate Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel - Burbank, CA [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 20,000 |
Carrying amount of loans | 20,000 |
Subordinate Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel - Phoenix, AZ [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 25,000 |
Carrying amount of loans | 25,000 |
Subordinate Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel - Washington D.C. [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 20,000 |
Carrying amount of loans | 19,978 |
Subordinate Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel, New York, NY, March 2017 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 50,000 |
Carrying amount of loans | 50,228 |
Subordinate Mortgage Portfolio Segment [Member] | Multifamily Portfolio [Member] | Multifamily Portfolio - Florida [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 22,000 |
Carrying amount of loans | 21,967 |
Subordinate Mortgage Portfolio Segment [Member] | Multifamily Portfolio [Member] | Multifamily Portfolio - Florida (2) [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 15,500 |
Carrying amount of loans | 15,477 |
Subordinate Mortgage Portfolio Segment [Member] | Mixed Use [Member] | Mixed Use - North Carolina [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 6,525 |
Carrying amount of loans | 6,525 |
Subordinate Mortgage Portfolio Segment [Member] | Mixed Use [Member] | Mixed Use, New York, NY, October 2019 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 30,000 |
Carrying amount of loans | 29,926 |
Subordinate Mortgage Portfolio Segment [Member] | Office [Member] | Office Complex - Missouri [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 9,414 |
Carrying amount of loans | 9,414 |
Subordinate Mortgage Portfolio Segment [Member] | Warehouse [Member] | Warehouse Portfolio - Various [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 32,000 |
Carrying amount of loans | 32,000 |
Subordinate Mortgage Portfolio Segment [Member] | Ski Resort [Member] | Ski Resort Montana [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 15,000 |
Carrying amount of loans | 14,773 |
Subordinate Mortgage Portfolio Segment [Member] | Senior Housing Facility [Member] | Senior Housing - United Kingdom [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 41,693 |
Carrying amount of loans | 41,693 |
Subordinate Mortgage Portfolio Segment [Member] | Destination Resort [Member] | Destination Resort, Various [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 75,000 |
Carrying amount of loans | 72,877 |
Subordinate Mortgage Portfolio Segment [Member] | Condo Pre-development [Member] | Condo Pre-development, United Kingdom [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 123,400 |
Carrying amount of loans | 123,400 |
Subordinate Mortgage Portfolio Segment [Member] | Healthcare [Member] | Healthcare Portfolio - Various [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 130,000 |
Carrying amount of loans | 128,856 |
Subordinate to Company's Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 12,573 | 26,328
Carrying amount of loans | 7,513 | 26,095
Unfunded Commitment | 7,501 | 12,478
Subordinate to Company's Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel, New York, NY, September 2018 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 7,573 | 2,595
Carrying amount of loans | 7,513 | 2,458
Unfunded Commitment | 7,501 | 12,478
Subordinate to Company's Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Multifamily Portfolio [Member] | Multifamily - Williston, ND [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 5,000 | 5,000
Carrying amount of loans | 0 | 5,000
Unfunded Commitment | 0 | 0
Subordinate to Company's Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Mixed Use [Member] | Mixed Use - Brooklyn, NY [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance |  | 12,347
Carrying amount of loans |  | 12,222
Unfunded Commitment |  | 0
Subordinate to Company's Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Condo Conversion [Member] | Condo Conversion, New York, NY, September 2016 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance |  | 6,386
Carrying amount of loans |  | 6,415
Unfunded Commitment |  | 0
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 1,048,656 | 912,678
Carrying amount of loans | 1,043,723 | 905,256
Unfunded Commitment | 47,886 | 41,945
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Hotel [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance |  | 25,000
Carrying amount of loans |  | 25,000
Unfunded Commitment |  | 0
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel Portfolio - Rochester, MN [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 23,863 | 24,182
Carrying amount of loans | 23,863 | 24,182
Unfunded Commitment | 0 | 0
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel - Burbank, CA [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 20,000 | 20,000
Carrying amount of loans | 20,000 | 20,000
Unfunded Commitment | 0 | 0
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel - Phoenix, AZ [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 25,000 |
Carrying amount of loans | 25,000 |
Unfunded Commitment | 0 |
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel - Washington D.C. [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 20,000 | 20,000
Carrying amount of loans | 19,978 | 19,934
Unfunded Commitment | 0 | 0
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel, New York, NY, March 2017 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 50,000 | 50,000
Carrying amount of loans | 50,228 | 49,522
Unfunded Commitment |  | 0
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Multifamily Portfolio [Member] | Multifamily Portfolio - Florida [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 22,000 | 22,000
Carrying amount of loans | 21,967 | 21,895
Unfunded Commitment | 0 | 0
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Multifamily Portfolio [Member] | Multifamily Portfolio - Florida (2) [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 15,500 | 15,500
Carrying amount of loans | 15,477 | 15,426
Unfunded Commitment | 0 | 0
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Multifamily Portfolio [Member] | Multifamily, New York, New York [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 55,000 | 55,000
Carrying amount of loans | 54,775 | 54,558
Unfunded Commitment | 0 | 0
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Mixed Use [Member] | Mixed Use - North Carolina [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 6,525 | 6,525
Carrying amount of loans | 6,525 | 6,525
Unfunded Commitment | 0 | 0
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Mixed Use [Member] | Mixed Use - New York, NY [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 99,581 |
Carrying amount of loans | 99,660 |
Unfunded Commitment | 0 |
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Mixed Use [Member] | Mixed Use - Various, May 2017 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 45,000 | 45,000
Carrying amount of loans | 45,174 | 44,854
Unfunded Commitment | 0 | 0
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Mixed Use [Member] | Mixed Use, New York, NY, October 2018 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 30,000 | 30,000
Carrying amount of loans | 29,926 | 29,785
Unfunded Commitment | 0 | 0
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Mixed Use [Member] | Mixed Use, New York, NY, October 2019 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 30,175 |
Carrying amount of loans | 29,924 |
Unfunded Commitment | 0 |
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Mixed Use [Member] | Mixed Use Various, December 2016 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance |  | 19,500
Carrying amount of loans |  | 19,377
Unfunded Commitment |  | 0
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Mixed Use [Member] | Mixed Use - London, England [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance |  | 50,676
Carrying amount of loans |  | 50,676
Unfunded Commitment |  | 0
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Mixed Use [Member] | Mixed Use - New York, NY, December 2017 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance |  | 88,368
Carrying amount of loans |  | 87,818
Unfunded Commitment |  | 785
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Office [Member] | Office Complex - Missouri [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 9,414 | 9,566
Carrying amount of loans | 9,414 | 9,566
Unfunded Commitment | 0 | 0
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Office [Member] | Office Condo New York, NY [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 14,000 | 14,000
Carrying amount of loans | 13,679 | 13,631
Unfunded Commitment | 0 | 0
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Office [Member] | Office - Michigan [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance |  | 8,753
Carrying amount of loans |  | 8,753
Unfunded Commitment |  | 0
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Warehouse [Member] | Warehouse Portfolio - Various [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 32,000 | 32,000
Carrying amount of loans | 32,000 | 32,000
Unfunded Commitment | 0 | 0
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Ski Resort [Member] | Ski Resort Montana [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 15,000 |
Carrying amount of loans | 14,773 |
Unfunded Commitment | 0 |
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Ski Resort [Member] | Ski Resort, Big Sky, MT [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance |  | 15,000
Carrying amount of loans |  | 14,878
Unfunded Commitment |  | 0
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Senior Housing Facility [Member] | Senior Housing - United Kingdom [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 41,693 | 79,735
Carrying amount of loans | 41,693 | 79,735
Unfunded Commitment | 0 | 0
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Condo Development [Member] | Condo Development - New York, NY [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 56,925 | 34,184
Carrying amount of loans | 56,693 | 33,567
Unfunded Commitment | 19,830 | 41,160
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Condo Conversion [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 59,636 |
Carrying amount of loans | 59,442 |
Unfunded Commitment | 0 |
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Condo Conversion [Member] | Condo Conversion, New York, NY, August 2018 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance |  | 52,418
Carrying amount of loans |  | 51,941
Unfunded Commitment |  | 0
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Condo Conversion [Member] | Condo Conversion, New York, NY, July 2019 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 48,944 |
Carrying amount of loans | 48,399 |
Unfunded Commitment | 28,056 |
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Destination Resort [Member] | Destination Resort, Various [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 75,000 | 75,000
Carrying amount of loans | 72,877 | 71,362
Unfunded Commitment | 0 | 0
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Condo Pre-development [Member] | Condo Pre-development, United Kingdom [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 123,400 | 81,048
Carrying amount of loans | 123,400 | 81,048
Unfunded Commitment | 0 | 0
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Healthcare [Member] | Condo Conversion, New York, NY, August 2018 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance | 130,000 |
Carrying amount of loans | 128,856 |
Unfunded Commitment | $ 0 |
Subordinate to Third Party Commercial Mortgage Loans [Member] | Subordinate Mortgage Portfolio Segment [Member] | Healthcare [Member] | Healthcare Portfolio - Various [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Current Principal Balance |  | 39,223
Carrying amount of loans |  | 39,223
Unfunded Commitment |  | $ 0

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