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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
Mar. 31, 2022
Mar. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]    
Derivatives not designated as hedging instruments, Derivatives $ 1,852 $ (1,626)
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 (43,273) (32,658)
Derivatives in fair value hedging relationships, Hedged item 42,998 31,898
Interest Rate Contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivatives not designated as hedging instruments, Derivatives 106 (3,234)
Foreign Exchange and Other Option and Futures Contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivatives not designated as hedging instruments, Derivatives $ 1,746 $ 1,608