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Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading securities $ 56,311 $ 29,617    
Available for sale securities 6,771,179 6,806,949    
Derivatives 23,745 12,303    
Contingent consideration liability   17,718 $ 31,291 $ 53,411
Derivatives 31,858 12,258    
U.S. Treasury        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available for sale securities 363,337 349,779    
U.S. Agencies        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available for sale securities 421,625 666,389    
State and political subdivisions [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available for sale securities 2,305,979 2,138,413    
Mortgage-backed [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available for sale securities 3,600,175 3,572,446    
Corporates [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available for sale securities 80,063 79,922    
Fair Value Measurement, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading securities 56,311 29,617    
Available for sale securities 6,771,179 6,806,949    
Company-owned life insurance 36,479 31,205    
Bank-owned life insurance 206,508 202,991    
Derivatives 23,745 12,303    
Total 7,094,222 7,083,065    
Deferred compensation 37,715 32,937    
Contingent consideration liability   17,718    
Derivatives 31,858 12,258    
Total 69,573 62,913    
Fair Value Measurement, Recurring [Member] | Trading - other [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading securities 27,907 17,708    
Fair Value Measurement, Recurring [Member] | U.S. Treasury        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading securities 400 400    
Available for sale securities 363,337 349,779    
Fair Value Measurement, Recurring [Member] | U.S. Agencies        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading securities 2,351 1,309    
Available for sale securities 421,625 666,389    
Fair Value Measurement, Recurring [Member] | State and political subdivisions [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading securities 19,084 10,200    
Available for sale securities 2,305,979 2,138,413    
Fair Value Measurement, Recurring [Member] | Mortgage-backed [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading securities 6,569      
Available for sale securities 3,600,175 3,572,446    
Fair Value Measurement, Recurring [Member] | Corporates [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available for sale securities 80,063 79,922    
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading securities 28,200 18,100    
Available for sale securities 443,400 429,700    
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value Measurement, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading securities 28,190 18,108    
Available for sale securities 443,400 429,701    
Total 471,590 447,809    
Deferred compensation 37,715 32,937    
Total 37,715 32,937    
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value Measurement, Recurring [Member] | Trading - other [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading securities 27,790 17,708    
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value Measurement, Recurring [Member] | U.S. Treasury        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading securities 400 400    
Available for sale securities 363,337 349,779    
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value Measurement, Recurring [Member] | Corporates [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available for sale securities 80,063 79,922    
Significant Other Observable Inputs (Level 2) [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading securities 28,100 11,500    
Available for sale securities 6,327,800 6,377,200    
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurement, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading securities 28,121 11,509    
Available for sale securities 6,327,779 6,377,248    
Company-owned life insurance 36,479 31,205    
Bank-owned life insurance 206,508 202,991    
Derivatives 23,745 12,303    
Total 6,622,632 6,635,256    
Derivatives 31,858 12,258    
Total 31,858 12,258    
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurement, Recurring [Member] | Trading - other [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading securities 117      
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurement, Recurring [Member] | U.S. Agencies        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading securities 2,351 1,309    
Available for sale securities 421,625 666,389    
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurement, Recurring [Member] | State and political subdivisions [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading securities 19,084 10,200    
Available for sale securities 2,305,979 2,138,413    
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurement, Recurring [Member] | Mortgage-backed [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading securities 6,569      
Available for sale securities $ 3,600,175 3,572,446    
Significant Unobservable Inputs (Level 3) [Member] | Fair Value Measurement, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent consideration liability   17,718    
Total   $ 17,718