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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
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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