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Fair Value Measurements - Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account securities $ 25,292 $ 24,456
Derivative assets 28,141 11,111
Derivative liabilities 224,432 69,323
Securities available for sale, at estimated fair value 11,731,222 10,437,565
Interest rate swaps, caps and floors [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 53,186 85,665
Derivative liabilities 27,609 35,187
Commodity swaps and options [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 227,527 45,991
Derivative liabilities 226,054 45,099
Foreign Exchange Forward [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 4  
U.S. Treasury [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account securities 24,087 23,996
Securities available for sale, at estimated fair value 1,685,221 1,119,633
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 2,491,154 1,987,679
States and political subdivisions [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account securities 1,205 460
Securities available for sale, at estimated fair value 7,512,489 7,287,902
Other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale, at estimated fair value 42,358 42,351
Level 1 [Member] | Foreign Exchange Forward [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 4  
Level 1 [Member] | U.S. Treasury [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account securities 24,087 23,996
Securities available for sale, at estimated fair value 1,685,221 1,119,633
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 53,186 85,665
Derivative liabilities 27,609 35,187
Level 2 [Member] | Commodity swaps and options [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 227,527 45,535
Derivative liabilities 226,054 45,099
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 2,491,154 1,987,679
Level 2 [Member] | States and political subdivisions [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading account securities 1,205 460
Securities available for sale, at estimated fair value 7,512,489 7,287,902
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 42,358 42,351
Level 3 [Member] | Commodity swaps and options [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets $ 0 $ 456