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Commitments and Contingent Liabilities - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Loss Contingencies [Line Items]
Loan commitments outstanding	$ 6,408,827,000	$ 5,886,473,000
Loan commitments expiry period	1 year
Commercial Letters of Credit [Member]
Loss Contingencies [Line Items]
Letters of credit issued	$ 2,762,000	15,546,000
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Letters of credit issued	$ 166,885,000	$ 148,874,000

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