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Investment Securities - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
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	23 years
Total deposits	$ 11,790,325	11,433,642
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	$ 2,520,000	2,260,000
Total deposits	1,410,000	1,380,000
Secure public funds	363,300	372,500
Outstanding borrowings	1,350,000	1,800,000
Secured unused borrowing capacity	427,400	796,000
Other purposes	46,000	51,000
Pledged to secure unused borrowing capacity	$ 2,180,000	$ 3,020,000

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Investment securities for other purposes

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Outstanding Borrowings

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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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