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Loans - Net (Charge-Offs)/Recoveries, Segregated by Class of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Net charge-offs $ (3,764) $ (3,888) $ (20,628) $ (7,954)
Commercial and industrial, Energy [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Net charge-offs     (900) 4
Commercial and industrial, Other commercial [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Net charge-offs (2,883) (3,180) (18,510) (4,855)
Commercial real estate, Buildings, land and other [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Net charge-offs (244) 493 (29) (1,867)
Commercial real estate, Construction [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Net charge-offs 116 12 230 22
Consumer Real Estate [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Net charge-offs 15 (519) (261) (285)
Consumer and Other [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Net charge-offs $ (768) $ (694) $ (1,158) $ (973)