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Commercial Mortgage Loan Portfolio (Footnotes) (Detail) - Commercial mortgage loans [Member] $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016 USD ($) option	Dec. 31, 2015 USD ($) option
Mortgage Loans on Real Estate [Line Items]
Unfunded loan commitments	$ 108,883
Condo Construction [Member] | Condominium Bethesda, MD [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term	6 months	6 months
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	$ 15,100	$ 15,100
Hotel [Member] | Hotel - New York, 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	2	2
Unfunded loan commitments	$ 39,553	$ 40,034
Hotel [Member] | Hotel, U.S. Virgin Islands [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	$ 1,500	$ 1,500
Hotel, Mixed Use, Multifamily and Vacation Home [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
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
Retail Redevelopment [Member] | Retail Redevelopment - Miami, FL [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term	6 months	6 months
Number of options to extend loan agreement | option	2
Retail Redevelopment [Member] | Retail Redevelopment - Miami, FL January 2016 [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term	1 year
Unfunded loan commitments	$ 42,500
Mixed Use [Member] | Mixed Use - Brooklyn, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Unfunded loan commitments	$ 6,730	$ 6,730
Retail [Member] | Retail - Brooklyn, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Unfunded loan commitments		$ 9,000
Office [Member] | Office, Richmond, VA [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	$ 1,000	$ 1,000
Office [Member] | Office - Boston, MA [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term	6 months
Number of options to extend loan agreement | option	1
Unfunded loan commitments	$ 2,500

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