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Loans and Allowance for Credit Losses - Schedule of Past Due Loans with Age Analysis, Segregated by Class of Loans (Parenthetical) (Detail) (Residential mortgage loans held for sale [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Residential mortgage loans held for sale [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Residential mortgage loans held for sale $ 2,210 $ 10,433