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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
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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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