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Commercial Mortgage Loan Portfolio (Parenthetical) (Detail) (Commercial mortgage loans [Member], USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
option
Condo Conversion [Member] | Condo Conversion - NY, NY December 2012 [Member]
  
Mortgage Loans on Real Estate [Line Items]  
Number of options to extend loan agreement 2
Option to extend loan agreement, term 1 year
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 Construction [Member] | Condo Construction Potomac, MD [Member]
  
Mortgage Loans on Real Estate [Line Items]  
Option to extend loan agreement, term 6 months
Unfunded loan commitments $ 55,000
Condo Construction [Member] | Condo Construction Bethesda, MD [Member]
  
Mortgage Loans on Real Estate [Line Items]  
Option to extend loan agreement, term 6 months
Unfunded loan commitments 45,100
Multifamily Conversion [Member] | Multifamily - Brooklyn, NY [Member]
  
Mortgage Loans on Real Estate [Line Items]  
Number of options to extend loan agreement 3
Option to extend loan agreement, term 1 year
Unfunded loan commitments $ 4,500