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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	$ 18,049,199	$ 17,819,711
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	5,163,320	5,994,640
Commercial letters of credit [Member]
Commitments and Contingencies Disclosure [Line Items]
Contractual or notional amount of off-balance sheet financial instruments	2,144	217
Standby letters of credit [Member]
Commitments and Contingencies Disclosure [Line Items]
Contractual or notional amount of off-balance sheet financial instruments	483,578	468,384
Forward contracts [Member]
Commitments and Contingencies Disclosure [Line Items]
Contractual or notional amount of off-balance sheet financial instruments	151,279	119,978
Spot foreign exchange contracts [Member]
Commitments and Contingencies Disclosure [Line Items]
Contractual or notional amount of off-balance sheet financial instruments	67,479	34,233
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	$ 876,000	$ 191,000

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Commitments and contingencies disclosure.

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Nominal or face amount used to calculate payments on off-balance sheet financial instruments.

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