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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives not designated as hedging instruments, derivatives $ 16,000 $ 10,000 $ 34,000 $ 24,000
Interest rate swap agreements | Designated as Hedging Instrument | Fair value hedges:        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives in fair value hedging relationships, derivative 13,000 130,000 160,000 52,000
Derivatives in fair value hedging relationships, hedged item $ (13,000) $ (130,000) $ (160,000) $ (52,000)
Interest rate swap agreements | Fixed Rate Long-Term Borrowings | Designated as Hedging Instrument | Fair value hedges:        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, gain (loss), statement of income or comprehensive income [extensible enumeration] Other costs of operations Other costs of operations Other costs of operations Other costs of operations
Derivatives in fair value hedging relationships, derivative $ 13,000 $ 130,000 $ 160,000 $ 52,000
Derivatives in fair value hedging relationships, hedged item (13,000) (130,000) (160,000) (52,000)
Interest rate swap agreements | Fixed Rate Available For Sale Securities | Designated as Hedging Instrument | Fair value hedges:        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives in fair value hedging relationships, derivative       0
Derivatives in fair value hedging relationships, hedged item       0
Interest Rate Contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives not designated as hedging instruments, derivatives 11,000 5,000 23,000 11,000
Foreign exchange and other option and futures contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives not designated as hedging instruments, derivatives $ 5,000 $ 5,000 $ 11,000 $ 13,000