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Loans - Age Analysis of Past Due Loans, Segregated by Class of Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans $ 108,827    
Current Loans 11,250,123    
Total loans 11,358,950 $ 10,987,535 $ 10,746,766
Accruing Loans 90 or More Days Past Due 7,712    
Commercial and industrial, Energy [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 16,760    
Current Loans 1,771,748    
Total loans 1,788,508    
Accruing Loans 90 or More Days Past Due 568    
Commercial and industrial, Other commercial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 42,021    
Current Loans 4,046,370    
Total loans 4,088,391    
Accruing Loans 90 or More Days Past Due 1,898    
Commercial real estate, Buildings, land and other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 35,490    
Current Loans 3,467,366    
Total loans 3,502,856    
Accruing Loans 90 or More Days Past Due 2,941    
Construction Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 1,276    
Current Loans 717,715    
Total loans 718,991    
Accruing Loans 90 or More Days Past Due 326    
Consumer Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 5,066    
Current Loans 866,604    
Total loans 871,670    
Accruing Loans 90 or More Days Past Due 1,025    
Consumer and Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 8,214    
Current Loans 404,758    
Total loans 412,972    
Accruing Loans 90 or More Days Past Due 954    
Unearned discounts [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 0    
Current Loans (24,438)    
Total loans (24,438)    
Accruing Loans 90 or More Days Past Due 0    
Financing Receivables, 30 to 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 65,696    
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial and industrial, Energy [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 3,062    
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial and industrial, Other commercial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 22,387    
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial real estate, Buildings, land and other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 28,405    
Financing Receivables, 30 to 89 Days Past Due [Member] | Construction Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 950    
Financing Receivables, 30 to 89 Days Past Due [Member] | Consumer Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 3,699    
Financing Receivables, 30 to 89 Days Past Due [Member] | Consumer and Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 7,193    
Financing Receivables, 30 to 89 Days Past Due [Member] | Unearned discounts [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 0    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 43,131    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial and industrial, Energy [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 13,698    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial and industrial, Other commercial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 19,634    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate, Buildings, land and other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 7,085    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Construction Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 326    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 1,367    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer and Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 1,021    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Unearned discounts [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans $ 0