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Loans - Age Analysis of Past Due Loans, Segregated by Class of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans 30-89 Days Past Due $ 28,719    
Loans 90 or More Days Past Due 31,800    
Total Past Due Loans 60,519    
Current Loans 9,690,126    
Total loans 9,750,645 9,515,700 9,162,351
Accruing Loans 90 or More Days Past Due 9,039    
Commercial and industrial, Energy [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans 30-89 Days Past Due 1    
Loans 90 or More Days Past Due 526    
Total Past Due Loans 527    
Current Loans 1,151,792    
Total loans 1,152,319    
Accruing Loans 90 or More Days Past Due 0    
Commercial and industrial, Other commercial [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans 30-89 Days Past Due 10,078    
Loans 90 or More Days Past Due 12,602    
Total Past Due Loans 22,680    
Current Loans 3,931,727    
Total loans 3,954,407    
Accruing Loans 90 or More Days Past Due 4,419    
Commercial real estate, Buildings, land and other [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans 30-89 Days Past Due 9,814    
Loans 90 or More Days Past Due 15,287    
Total Past Due Loans 25,101    
Current Loans 3,025,547    
Total loans 3,050,648    
Accruing Loans 90 or More Days Past Due 1,622    
Commercial real estate, Construction [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans 30-89 Days Past Due 411    
Loans 90 or More Days Past Due 0    
Total Past Due Loans 411    
Current Loans 445,080    
Total loans 445,491    
Accruing Loans 90 or More Days Past Due 0    
Consumer Real Estate [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans 30-89 Days Past Due 5,876    
Loans 90 or More Days Past Due 2,332    
Total Past Due Loans 8,208    
Current Loans 810,789    
Total loans 818,997    
Accruing Loans 90 or More Days Past Due 2,105    
Consumer and Other [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans 30-89 Days Past Due 2,539    
Loans 90 or More Days Past Due 1,053    
Total Past Due Loans 3,592    
Current Loans 348,728    
Total loans 352,320    
Accruing Loans 90 or More Days Past Due 893    
Unearned discounts [Member]
      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans 30-89 Days Past Due 0    
Loans 90 or More Days Past Due 0    
Total Past Due Loans 0    
Current Loans (23,537)    
Total loans (23,537)    
Accruing Loans 90 or More Days Past Due $ 0