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Commercial Mortgage Loan Portfolio (Footnotes) (Detail) - Commercial mortgage loans [Member] $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($) option	Dec. 31, 2014 USD ($) option
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term	1 year
Unfunded loan commitments	$ 124,729
Condo Construction [Member] | Condo Construction Potomac, MD [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term	6 months	6 months
Unfunded loan commitments		$ 52,000
Condo Construction [Member] | Condo Construction Bethesda, MD [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term	6 months	6 months
Unfunded loan commitments	$ 32,100	$ 45,100
Condo Conversion [Member] | Condo Conversion - NY, NY August 2013 [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term		1 year
Condo Conversion [Member] | Condo Conversion New York, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term	6 months	6 months
Hotel, Multifamily, and Vacation Home Portfolio [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term	1 year
Number of options to extend loan agreement | option	2
Hotel [Member] | Hotel - Philadelphia, PA [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term		1 year
Number of options to extend loan agreement | option		2
Hotel [Member] | Hotel - New York, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term	1 year
Number of options to extend loan agreement | option	2
Unfunded loan commitments	$ 40,599
Multifamily Conversion [Member] | Multifamily - Brooklyn, NY [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 | option	3	3
Unfunded loan commitments		$ 4,500
Mixed Use [Member] | Mixed Use - Cincinnati, OH [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 | option	2	2
Unfunded loan commitments	$ 36,300	$ 145,000
Mixed Use [Member] | Mixed Use - Brooklyn, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Unfunded loan commitments	$ 6,730
Retail Redevelopment [Member] | Retail Redevelopment - Miami, FL [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term	6 months
Number of options to extend loan agreement | option	2
Retail [Member] | Retail - Brooklyn, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Unfunded loan commitments	$ 9,000

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