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Loans - Age Analysis of Past Due Loans, Segregated by Class of Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans $ 118,736    
Current Loans 11,282,088    
Total loans 11,400,824 $ 10,987,535 $ 10,677,329
Accruing Loans 90 or More Days Past Due 19,767    
Commercial and industrial, Energy [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 16,712    
Current Loans 1,780,353    
Total loans 1,797,065    
Accruing Loans 90 or More Days Past Due 10,181    
Commercial and industrial, Other commercial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 59,299    
Current Loans 4,109,545    
Total loans 4,168,844    
Accruing Loans 90 or More Days Past Due 3,398    
Commercial real estate, Buildings, land and other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 27,954    
Current Loans 3,399,910    
Total loans 3,427,864    
Accruing Loans 90 or More Days Past Due 3,875    
Construction Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 2,185    
Current Loans 759,649    
Total loans 761,834    
Accruing Loans 90 or More Days Past Due 376    
Consumer Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 8,861    
Current Loans 858,829    
Total loans 867,690    
Accruing Loans 90 or More Days Past Due 1,351    
Consumer and Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 3,725    
Current Loans 398,268    
Total loans 401,993    
Accruing Loans 90 or More Days Past Due 586    
Unearned discounts [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 0    
Current Loans (24,466)    
Total loans (24,466)    
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 72,322    
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 5,895    
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 35,600    
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 18,831    
Financing Receivables, 30 to 89 Days Past Due [Member] | Construction Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due Loans 1,809    
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 7,097    
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 3,090    
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 46,414    
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 10,817    
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 23,699    
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 9,123    
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 376    
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 1,764    
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 635    
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