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Subordinate Loans - Loans Portfolio (Footnotes) (Detail) - Subordinate loans [Member] $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($) option	Dec. 31, 2014 USD ($) option
Hotel, Condo Construction, Condo Conversion, and Multifamily Conversion
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term	1 year	1 year
Mixed Use, Hotel and Condo Conversion [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term	1 year
Number of options to extend loan agreement	2
Mixed Use [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term		1 year
Number of options to extend loan agreement		2
Healthcare Portfolio, Multifamily Portfolio and Mixed Use [Member]
Mortgage Loans on Real Estate [Line Items]
Number of options to extend loan agreement	3
Healthcare Portfolio and Hotel [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term		1 year
Number of options to extend loan agreement		3
Mixed Use - New York, NY [Member] | Mixed Use [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term	1 year	1 year
Number of options to extend loan agreement	2	2
Unfunded loan commitments | $	$ 11,557	$ 32,500
Condo Development - New York, NY [Member] | Condo Development [Member]
Mortgage Loans on Real Estate [Line Items]
Unfunded loan commitments | $	$ 202,197
Multifamily Conversion - New York, NY [Member] | Multifamily Conversion [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term		3 months
Hotel - New York, NY, September 2018 [Member] | Hotel [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term	1 year
Number of options to extend loan agreement	2
Unfunded loan commitments | $	$ 12,512
Destination Resort - Various [Member] | Destination Resort [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term	1 year
Number of options to extend loan agreement	4

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Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 825



-SubTopic 10



-Section 50



-Paragraph 10



-Subparagraph (a)



-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611

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