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Investment Securities - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Debt securities, held-to-maturity, allowance for credit loss	$ 0	$ 0
Debt securities weighted average remaining contractual maturity term	25 years
Total deposits	$ 12,124,239	11,948,381
United States [Member]
Debt Securities, Available-for-sale [Line Items]
Securities issued by U.S. government percentage	90.00%
Investment Securities-AFS [Member]
Debt Securities, Available-for-sale [Line Items]
Pledged to secure amount	$ 2,700,000	2,790,000
Secure public funds	569,000	372,500
Outstanding borrowings		1,800,000
Secured unused borrowing capacity	1,240,000	796,000
Other purposes	57,000	51,000
Pledged to secure unused borrowing capacity	$ 1,860,000	$ 1,630,000

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Investment securities for other purposes

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Secure Public Funds

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Securities issued by government or government sponsored agencies and enterprises percentage.

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity).

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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