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Commitments, Contingencies and Guarantees - Notional Amount of Off-Balance Sheet Financial Instruments (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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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 | $ 11,229,926 | $ 10,122,617
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 | 3,846,870 | 3,743,165
Commercial letters of credit [Member] |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Contract or notional amount of off-balance sheet financial instruments | 2,694 | 2,754
Standby letters of credit [Member] |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Contract or notional amount of off-balance sheet financial instruments | 423,628 | 365,030
Forward contracts [Member] |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Contract or notional amount of off-balance sheet financial instruments | 5,555 | 9,729
Spot foreign exchange contracts [Member] |  |
Commitments and Contingencies Disclosure [Line Items] |  |
Contract or notional amount of off-balance sheet financial instruments | $ 3,663 | $ 2,946

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