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Commercial Loans Held for Investment by Risk Category (Detail) (Commercial Loans Held For Investment, USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Commercial Loans [Line Items]    
Commercial loans held for investment $ 332,258 $ 353,331
Pass
   
Commercial Loans [Line Items]    
Commercial loans held for investment 306,575 309,792
Watch List
   
Commercial Loans [Line Items]    
Commercial loans held for investment $ 25,683 $ 43,539