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Commercial Mortgage Loan Portfolio (Footnotes) (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) option	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) option
Mortgage Loans on Real Estate [Line Items]
Provision for loan losses	$ 0	$ 0	$ 15,000,000	$ 0
Commercial Mortgage Portfolio Segment [Member]
Mortgage Loans on Real Estate [Line Items]
Provision for loan losses	0		10,000,000
Loans and Leases Receivable, Allowance	10,000,000		$ 10,000,000		$ 0
Commercial Mortgage Portfolio Segment [Member] | Condo Construction [Member] | Condominium Bethesda, MD [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term			6 months		6 months
Commercial Mortgage Portfolio Segment [Member] | 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					$ 15,100,000
Commercial Mortgage Portfolio Segment [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 | option					2
Commercial Mortgage Portfolio Segment [Member] | 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	36,643,000		$ 36,643,000		$ 40,034,000
Commercial Mortgage Portfolio Segment [Member] | 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	1,500,000		$ 1,500,000		$ 1,500,000
Commercial Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel, New York, NY, August 2018 [Member]
Mortgage Loans on Real Estate [Line Items]
Option to extend loan agreement, term			1 year
Number of options to extend loan agreement | option			3
Unfunded loan commitments	26,860,000		$ 26,860,000
Commercial Mortgage Portfolio Segment [Member] | 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
Commercial Mortgage Portfolio Segment [Member] | 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		2
Commercial Mortgage Portfolio Segment [Member] | 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
Commercial Mortgage Portfolio Segment [Member] | 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 | option			2
Commercial Mortgage Portfolio Segment [Member] | Mixed Use [Member] | Mixed Use - Brooklyn, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Unfunded loan commitments	6,730,000		$ 6,730,000		$ 6,730,000
Commercial Mortgage Portfolio Segment [Member] | Mixed Use [Member] | Mixed Use - New York, NY, June 2018 [Member]
Mortgage Loans on Real Estate [Line Items]
Number of options to extend loan agreement | option			6
Unfunded loan commitments	4,931,000		$ 4,931,000
Commercial Mortgage Portfolio Segment [Member] | Mixed Use [Member] | Mixed Use, Chicago, IL [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	5,000,000		$ 5,000,000
Commercial Mortgage Portfolio Segment [Member] | Retail [Member] | Retail - Brooklyn, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Unfunded loan commitments					$ 9,000,000
Commercial Mortgage Portfolio Segment [Member] | 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	1,000,000		$ 1,000,000		$ 1,000,000
Commercial Mortgage Portfolio Segment [Member] | 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	2,430,000		$ 2,430,000
Commercial Mortgage Portfolio Segment [Member] | Condo Conversion [Member] | Condo Conversion - Brooklyn, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Unfunded loan commitments	$ 4,900,000		$ 4,900,000

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