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Commercial Mortgage Loan Portfolio (Parenthetical) (Detail) (Commercial mortgage loans [Member], Condo Conversion [Member]) | 12 Months Ended
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Dec. 31, 2013 option
Condo Conversion - NY, NY December 2012 [Member] |
Mortgage Loans on Real Estate [Line Items] |
Number of Options to Extend Loan Agreement | 2
Debt Instrument, Option to Extend Loan Agreement, Term | 1 year
Condo Conversion - NY, NY August 2013 [Member] |
Mortgage Loans on Real Estate [Line Items] |
Debt Instrument, Option to Extend Loan Agreement, Term | 1 year

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- Details
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