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Fair Value Measurements - Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value $ 16,184,539 $ 13,924,628
Trading account securities 29,518 25,162
Derivative assets 34,988 23,339
Derivative liabilities 245,964 114,019
Interest rate swaps, caps and floors [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 33,697 44,310
Derivative liabilities 39,734 25,261
Commodity swaps and options [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 252,747 114,757
Derivative liabilities 251,181 113,261
Foreign Exchange Forward [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 150 33
Derivative liabilities 131 55
U.S. Treasury [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value 3,507,746 2,179,433
Trading account securities 23,939 24,237
Residential Mortgage Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value 5,376,039 4,066,265
States and political subdivisions [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value 7,258,393 7,636,571
Trading account securities 5,579 925
Other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value 42,361 42,359
Level 1 [Member] | Foreign Exchange Forward [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 150 33
Derivative liabilities 131 55
Level 1 [Member] | U.S. Treasury [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value 3,507,746 2,179,433
Trading account securities 23,939 24,237
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 33,697 44,310
Derivative liabilities 39,734 25,261
Level 2 [Member] | Commodity swaps and options [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 252,747 114,757
Derivative liabilities 251,181 113,261
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, at estimated fair value 5,376,039 4,066,265
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, at estimated fair value 7,258,393 7,636,571
Trading account securities 5,579 925
Level 2 [Member] | Other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value $ 42,361 $ 42,359