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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 | Sep. 30, 2013 | Dec. 31, 2012
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | $ 5,569,791 | $ 6,203,299
Trading account securities | 15,289 | 30,074
Derivative assets | 12,458 | 2,246
Derivative liabilities | 48,374 | 74,159
U.S. Treasury [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 2,544,061 | 3,057,921
Trading account securities | 15,289 | 14,038
Residential mortgage- backed securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 1,905,810 | 2,518,003
States and political subdivisions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 1,084,012 | 591,483
Trading account securities | 0 | 16,036
Other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 35,908 | 35,892
Interest rate swaps, caps and floors [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 46,082 | 60,890
Derivative liabilities | 50,990 | 72,557
Commodity swaps and options [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 8,618 | 3,867
Derivative liabilities | 8,358 | 3,772
Foreign currency forward contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 372 | 3
Derivative liabilities | 348 |
Level 1 [Member] | U.S. Treasury [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 2,544,061 | 3,057,921
Trading account securities | 15,289 | 14,038
Level 1 [Member] | Foreign currency forward contracts [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 372 | 3
Derivative liabilities | 348 |
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 | 1,905,810 | 2,518,003
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 | 1,084,012 | 591,483
Trading account securities | 0 | 16,036
Level 2 [Member] | Other [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities available for sale | 35,908 | 35,892
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 | 45,875 | 60,535
Derivative liabilities | 50,990 | 72,557
Level 2 [Member] | Commodity swaps and options [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 8,618 | 3,867
Derivative liabilities | 8,358 | 3,772
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 | $ 207 | $ 355

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