Derivative Financial Instruments - Schedule of Amounts Related to Non-Hedging Interest Rate and Commodity Derivatives (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
States and political subdivisions [Member] | Designated as Hedging Instrument [Member]
Other Non Interest Income Non Hedging Interest Rate Derivatives [Line Items]
Ineffectiveness on Interest Rate Fair Value Hedges is Immaterial	$ 28	$ 0
Interest Rate Contract [Member] | Other Non-Interest Income [Member] | Non Designated as Hedging Instrument [Member]
Other Non Interest Income Non Hedging Interest Rate Derivatives [Line Items]
Amount of gain (loss) included in income (expense)	1,532	389
Interest Rate Contract [Member] | Other Non-Interest Expense [Member] | Non Designated as Hedging Instrument [Member]
Other Non Interest Income Non Hedging Interest Rate Derivatives [Line Items]
Amount of gain (loss) included in income (expense)	0	(1)
Commodity Contract [Member] | Non Designated as Hedging Instrument [Member]
Other Non Interest Income Non Hedging Interest Rate Derivatives [Line Items]
Amount of gain (loss) included in income (expense)	1,132	1,766
Foreign Currency Derivative Contracts [Member] | Non Designated as Hedging Instrument [Member]
Other Non Interest Income Non Hedging Interest Rate Derivatives [Line Items]
Amount of gain (loss) included in income (expense)	$ 4	$ 55