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Loans - Troubled Debt Restructurings (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Financing Receivable, Modifications [Line Items]    
Balance at time of restructuring $ 819 $ 1,955
Balance at period end 793 1,888
Commercial and industrial, Energy [Member]
    
Financing Receivable, Modifications [Line Items]    
Balance at time of restructuring 0 0
Balance at period end 0 0
Commercial and industrial, Other commercial [Member]
    
Financing Receivable, Modifications [Line Items]    
Balance at time of restructuring 819 275
Balance at period end 793 275
Commercial real estate, Buildings, land and other [Member]
    
Financing Receivable, Modifications [Line Items]    
Balance at time of restructuring 0 1,680
Balance at period end $ 0 $ 1,613