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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives not designated as hedging instruments, Derivatives $ 10,301 $ 4,389 $ 17,200 $ 9,205
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 (20,683) 154 (63,956) (32,504)
Derivatives in fair value hedging relationships, Hedged item 20,762 (78) 63,760 31,820
Interest Rate Contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives not designated as hedging instruments, Derivatives 5,808 2,771 10,961 5,979
Foreign Exchange and Other Option and Futures Contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives not designated as hedging instruments, Derivatives $ 4,493 $ 1,618 $ 6,239 $ 3,226