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Commercial Mortgage Loan Portfolio (Detail) (Commercial mortgage loans [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended			3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 Hotel [Member] Hotel - NY, NY [Member] room	Dec. 31, 2013 Hotel [Member] Hotel - NY, NY [Member] room	Mar. 31, 2014 Hotel [Member] Hotel - Silver Spring, MD [Member] room	Dec. 31, 2013 Hotel [Member] Hotel - Silver Spring, MD [Member] room	Mar. 31, 2014 Office Condo [Member] Office Condo (Headquarters) - NY, NY [Member] sqft	Dec. 31, 2013 Office Condo [Member] Office Condo (Headquarters) - NY, NY [Member] sqft	Mar. 31, 2014 Condo Conversion [Member] Condo Conversion - NY, NY December 2012 [Member] sqft	Dec. 31, 2013 Condo Conversion [Member] Condo Conversion - NY, NY December 2012 [Member] sqft	Mar. 31, 2014 Condo Conversion [Member] Condo Conversion - NY, NY August 2013 [Member] sqft	Dec. 31, 2013 Condo Conversion [Member] Condo Conversion - NY, NY August 2013 [Member] sqft	Mar. 31, 2014 Condo Construction [Member] Condo Construction Potomac, MD [Member] unit
Mortgage Loans on Real Estate [Line Items]
Original Face Amount	$ 189,000		$ 164,000	$ 32,000	$ 32,000	$ 26,000	$ 26,000	$ 28,000	$ 28,000	$ 45,000	$ 45,000	$ 33,000	$ 33,000	$ 25,000
Current Face Amount	186,523		161,600	31,242	31,317	24,853	24,947	27,095	27,169	45,000	45,000	33,333	33,167	25,000
Carrying Value	$ 185,516		$ 161,099	$ 31,242	$ 31,317	$ 24,722	$ 24,785	$ 27,095	$ 27,169	$ 45,002	$ 44,867	$ 33,220	$ 32,961	$ 24,235
Coupon rate of loan	8.83%	8.82%
Property Size, Area								73,419	73,419	119,000	119,000	40,000	40,000
Property Size, Number of Units				151	151	263	263							50

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- Definition

Mortgage Loans on Real Estate, Area of Real Estate Property

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Loans held for investment current face amount.

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- Definition

Mortgage Loans on Real Estate, Number of Units in Real Estate Property

+ References

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- Definition

The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(c))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph c

-Article 7

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- Definition

Amount of the contractual principal due at the origination of the mortgage loan (face amount).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule IV)

-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 29

-Article 12



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule IV

-Article 5



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-29)

-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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- Definition

The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule IV)

-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 29

-Article 12



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule IV

-Article 5



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-29)

-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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