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Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities $ 67,091 $ 54,055
Available for sale 6,011,684 6,258,577
Derivative Assets, Fair Value 2,970 10,149
Derivative Liabilities, Fair Value 7,970 8,906
Securities sold not yet purchased 16,800 4,100
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 22,940 14,337
Available for sale 39,558 51,909
Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities 44,151 39,718
Available for sale 5,972,126 6,206,668
U.S. Treasury [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale 38,090 38,643
U.S. Agencies [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale 198 14,752
Mortgage-backed [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale 3,672,956 3,649,243
State and political subdivisions [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale 2,298,972 2,542,673
Corporates [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale 1,468 13,266
Fair Value Measurement, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities 67,091 54,055
Available for sale 6,011,684 6,258,577
Company-owned life insurance 56,770 53,577
Bank-owned life insurance 269,703 265,823
Derivative Assets, Fair Value 2,970 10,149
Total 6,408,218 6,642,181
Deferred compensation 53,084 50,963
Derivative Liabilities, Fair Value 7,970 8,906
Securities sold not yet purchased 16,834 4,130
Total 77,888 63,999
Fair Value Measurement, Recurring [Member] | Trading - other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities 13,219 13,113
Fair Value Measurement, Recurring [Member] | 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 22,940 14,337
Available for sale 39,558 51,909
Total 62,498 66,246
Deferred compensation 53,084 50,963
Total 53,084 50,963
Fair Value Measurement, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Trading - other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities 12,464 12,434
Fair Value Measurement, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities 44,151 39,718
Available for sale 5,972,126 6,206,668
Company-owned life insurance 56,770 53,577
Bank-owned life insurance 269,703 265,823
Derivative Assets, Fair Value 2,970 10,149
Total 6,345,720 6,575,935
Derivative Liabilities, Fair Value 7,970 8,906
Securities sold not yet purchased 16,834 4,130
Total 24,804 13,036
Fair Value Measurement, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Trading - other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities 755 679
Fair Value Measurement, Recurring [Member] | U.S. Treasury [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities 338 18
Available for sale 38,090 38,643
Fair Value Measurement, Recurring [Member] | U.S. Treasury [Member] | 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 338 18
Available for sale 38,090 38,643
Fair Value Measurement, Recurring [Member] | U.S. Agencies [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities 2,088 9,976
Available for sale 198 14,752
Fair Value Measurement, Recurring [Member] | U.S. Agencies [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities 2,088 9,976
Available for sale 198 14,752
Fair Value Measurement, Recurring [Member] | Mortgage-backed [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities   1,949
Available for sale 3,672,956 3,649,243
Fair Value Measurement, Recurring [Member] | Mortgage-backed [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities   1,949
Available for sale 3,672,956 3,649,243
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 41,308 27,114
Available for sale 2,298,972 2,542,673
Fair Value Measurement, Recurring [Member] | State and political subdivisions [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities 41,308 27,114
Available for sale 2,298,972 2,542,673
Fair Value Measurement, Recurring [Member] | Corporates [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities 10,138 1,885
Available for sale 1,468 13,266
Fair Value Measurement, Recurring [Member] | Corporates [Member] | 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 10,138 1,885
Available for sale $ 1,468 $ 13,266