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Subsequent Events (Detail)	1 Months Ended	9 Months Ended
	Oct. 31, 2015 USD ($) option	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Subsequent Event [Member]
Subsequent Event [Line Items]
Loans funded, amount	$ 50,502,000
Commercial mortgage loans [Member]
Subsequent Event [Line Items]
Mortgage loan, face amount		$ 928,130,000	$ 467,300,000
Option to extend loan agreement, term		1 year
Condominium and multifamily property [Member] | Commercial mortgage loans [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Mortgage loan, face amount	93,750,000
Mezzanine Loan [Member] | Condominium and multifamily property [Member] | Commercial mortgage loans [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Mortgage loan, face amount	$ 55,000,000
Loan term	3 years
Number of options to extend loan agreement | option	1
Option to extend loan agreement, term	6 months
Appraised loan to value ratio	81.00%
Internal rate of return	13.00%
First Mortgage [Member] | Condominium and multifamily property [Member] | Commercial mortgage loans [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Mortgage loan, face amount	$ 38,750,000

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Mortgage loans on real estate loan period.

+ References

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- Definition

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+ References

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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 948



-SubTopic 310



-Section S99



-Paragraph 1



-Subparagraph (SX 210.12-29)



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



Reference 2: 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 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 SEC



-Name Regulation S-X (SX)



-Number 210



-Section 29



-Article 12

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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