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Derivative Financial Instruments - Information about Fair Values of Derivative Instruments in Consolidated Statement of Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives not designated as hedging instruments, Derivatives $ 14,313 $ 10,301 $ 25,861 $ 17,200
Interest Rate Swap Agreements [Member] | Fixed Rate Long-Term Borrowings [Member] | Derivatives Designated and Qualifying as Hedging Instruments [Member] | Fair Value Hedges [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives in fair value hedging relationships, Derivative $ (46,429) $ (20,683) $ (34,392) $ (63,956)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Noninterest Expense Other Noninterest Expense Other Noninterest Expense Other Noninterest Expense
Derivatives in fair value hedging relationships, Hedged item $ 47,202 $ 20,762 $ (35,183) $ 63,760
Interest Rate Contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives not designated as hedging instruments, Derivatives 11,153 5,808 18,716 10,961
Foreign Exchange and Other Option and Futures Contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives not designated as hedging instruments, Derivatives $ 3,160 $ 4,493 $ 7,145 $ 6,239