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Commitments, Contingencies and Guarantees - Notional Amount of Off-Balance Sheet Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Commitments to extend credit for loans (excluding credit card loans) [Member]
Commitments and Contingencies Disclosure [Line Items]
Contractual or notional amount of off-balance sheet financial instruments	$ 16,858,573	$ 12,904,749
Commitments to extend credit under credit card loans [Member]
Commitments and Contingencies Disclosure [Line Items]
Contractual or notional amount of off-balance sheet financial instruments	6,718,465	5,474,758
Commercial letters of credit [Member]
Commitments and Contingencies Disclosure [Line Items]
Contractual or notional amount of off-balance sheet financial instruments		311
Standby letters of credit [Member]
Commitments and Contingencies Disclosure [Line Items]
Contractual or notional amount of off-balance sheet financial instruments	461,118	404,697
Forward contracts [Member]
Commitments and Contingencies Disclosure [Line Items]
Contractual or notional amount of off-balance sheet financial instruments	64,356	55,174
Spot foreign exchange contracts [Member]
Commitments and Contingencies Disclosure [Line Items]
Contractual or notional amount of off-balance sheet financial instruments	39,454	50,006
Commitments to extend credit for securities purchased under agreements to resell [Member]
Commitments and Contingencies Disclosure [Line Items]
Contractual or notional amount of off-balance sheet financial instruments	$ 181,000	$ 96,000

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Commitments and contingencies disclosure.

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