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Commitments and Contingencies - Summary of Credit Related Financial Instruments With Off-Balance Sheet Risk (Detail) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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Loss Contingencies [Line Items] |  |
Total credit-related financial instruments with off-balance sheet risk | $ 13,176,616 | $ 12,237,964
Standby letters of credit |  |
Loss Contingencies [Line Items] |  |
Total credit-related financial instruments with off-balance sheet risk | 636,811 | 578,912
Commercial letters of credit |  |
Loss Contingencies [Line Items] |  |
Total credit-related financial instruments with off-balance sheet risk | 22,421 | 28,287
Commitments to extend credit |  |
Loss Contingencies [Line Items] |  |
Total credit-related financial instruments with off-balance sheet risk | $ 12,517,384 | $ 11,630,765

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