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Commitments, Contingencies and Guarantees - Notional Amount of Off-Balance Sheet Financial Instruments (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Commitments to extend credit for loans (excluding credit card loans) [Member] |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Contract or notional amount of off-balance sheet financial instruments | $ 9,856,218 | $ 8,851,333
Commitments to extend credit under credit card loans [Member] |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Contract or notional amount of off-balance sheet financial instruments | 3,647,549 | 3,472,339
Commercial letters of credit [Member] |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Contract or notional amount of off-balance sheet financial instruments | 2,235 | 3,160
Standby letters of credit [Member] |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Contract or notional amount of off-balance sheet financial instruments | 356,957 | 346,617
Forward contracts [Member] |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Contract or notional amount of off-balance sheet financial instruments | 40,631 | 51,273
Spot foreign exchange contracts [Member] |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Contract or notional amount of off-balance sheet financial instruments | $ 2,043 | $ 680

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- Definition Nominal or face amount used to calculate payments on off-balance sheet financial instruments. + References No definition available. + Details
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