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Fair Value Measurements - Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, estimated fair value $ 5,482,465 $ 5,895,436
Trading account securities 15,524 16,398
Derivative assets 13,044 16,265
Derivative liabilities 46,786 42,603
U.S. Treasury [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, estimated fair value 1,838,758 2,540,554
Trading account securities 15,489 15,389
US Government Corporations and Agencies Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, estimated fair value   53,980
Residential mortgage- backed securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, estimated fair value 1,677,917 1,776,016
States and political subdivisions [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, estimated fair value 1,929,800 1,488,914
Trading account securities 35 1,009
Other [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, estimated fair value 35,990 35,972
Interest rate swaps, caps and floors [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 42,847 44,694
Derivative liabilities 45,609 47,542
Commodity swaps and options [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 13,119 10,026
Derivative liabilities 12,797 9,712
Foreign currency forward contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 289 135
Derivative liabilities 250 85
Level 1 [Member] | U.S. Treasury [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, estimated fair value 1,838,758 2,540,554
Trading account securities 15,489 15,389
Level 1 [Member] | Foreign currency forward contracts [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 289 135
Derivative liabilities 250 85
Level 2 [Member] | US Government Corporations and Agencies Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, estimated fair value   53,980
Level 2 [Member] | Residential mortgage- backed securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, estimated fair value 1,677,917 1,776,016
Level 2 [Member] | States and political subdivisions [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, estimated fair value 1,929,800 1,488,914
Trading account securities 35 1,009
Level 2 [Member] | Other [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, estimated fair value 35,990 35,972
Level 2 [Member] | Interest rate swaps, caps and floors [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 42,803 44,520
Derivative liabilities 45,609 47,542
Level 2 [Member] | Commodity swaps and options [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 13,119 10,026
Derivative liabilities 12,797 9,712
Level 3 [Member] | Interest rate swaps, caps and floors [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets $ 44 $ 174