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Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities $ 81,159 $ 54,055
Available for sale 5,932,741 6,258,577
Derivative Assets, Fair Value 2,499 10,149
Derivative Liabilities, Fair Value 11,465 8,906
Securities sold not yet purchased 40,300 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 22,070 14,337
Available for sale 37,938 51,909
Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities 59,089 39,718
Available for sale 5,894,803 6,206,668
U.S. Treasury [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale 37,938 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 3,620,378 3,649,243
State and political subdivisions [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale 2,274,227 2,542,673
Corporates [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale   13,266
Fair Value Measurement, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities 81,159 54,055
Available for sale 5,932,741 6,258,577
Company-owned life insurance 58,314 53,577
Bank-owned life insurance 271,623 265,823
Derivative Assets, Fair Value 2,499 10,149
Total 6,346,336 6,642,181
Deferred compensation 55,012 50,963
Derivative Liabilities, Fair Value 11,465 8,906
Securities sold not yet purchased 40,342 4,130
Total 106,819 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 13,059 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 22,070 14,337
Available for sale 37,938 51,909
Total 60,008 66,246
Deferred compensation 55,012 50,963
Total 55,012 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 12,547 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 59,089 39,718
Available for sale 5,894,803 6,206,668
Company-owned life insurance 58,314 53,577
Bank-owned life insurance 271,623 265,823
Derivative Assets, Fair Value 2,499 10,149
Total 6,286,328 6,575,935
Derivative Liabilities, Fair Value 11,465 8,906
Securities sold not yet purchased 40,342 4,130
Total 51,807 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 512 679
Fair Value Measurement, Recurring [Member] | U.S. Treasury [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities 35 18
Available for sale 37,938 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 35 18
Available for sale 37,938 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 9,171 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 9,171 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 3,620,378 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 3,620,378 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 49,406 27,114
Available for sale 2,274,227 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 49,406 27,114
Available for sale 2,274,227 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 9,488 1,885
Available for sale   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 $ 9,488 1,885
Available for sale   $ 13,266