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Subordinate Loan Portfolio (Parenthetical) (Detail) (Subordinate Loans [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Hotel, Condo Construction, Multifamily Conversion, and Mixed Use [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Option to extend loan agreement, term 1 year 1 year
Condo Conversion and Mixed Use [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 2 2
Multifamily Conversion [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Option to extend loan agreement, term 3 months 3 months
Condo Conversion [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Option to extend loan agreement, term 1 year 1 year
Unfunded loan commitments $ 29,106 $ 29,106