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Commitments and Contingencies - Summary of Credit Related Financial Instruments With Off-Balance Sheet Risk (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Loss Contingencies [Line Items] |  |
Total credit-related financial instruments with off-balance sheet risk | $ 12,237,964 | $ 12,563,441
Standby letters of credit |  |
Loss Contingencies [Line Items] |  |
Total credit-related financial instruments with off-balance sheet risk | 578,912 | 482,462
Commercial letters of credit |  |
Loss Contingencies [Line Items] |  |
Total credit-related financial instruments with off-balance sheet risk | 28,287 | 54,382
Commitments to extend credit |  |
Loss Contingencies [Line Items] |  |
Total credit-related financial instruments with off-balance sheet risk | $ 11,630,765 | $ 12,026,597

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