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Investment Securities - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-Maturity, Allowance for Credit Loss	$ 0	$ 0
Average life of investment grade debt securities, years	7 years 6 months
Credit-related impairment loss on investment securities held-to-maturity	$ 0	0
Investment in FHLB stock, impairment losses	$ 0
Debt securities weighted average remaining contractual maturity term	25 years
Total deposits	$ 11,948,381,000	11,433,642,000
Investment Securities-AFS [Member]
Debt Securities, Available-for-sale [Line Items]
Pledged to secure amount	2,790,000,000	2,260,000,000
Total deposits	1,180,000,000	1,380,000,000
Pledged to secure unused borrowing capacity		3,020,000,000.00
Debt Instrument, Unused Borrowing Capacity, Amount	1,630,000,000	796,000,000
Secure Public Funds	315,000,000	372,500,000
Outstanding borrowings		1,800,000,000
Pledged to secure unused borrowing capacity	$ 1,630,000,000	796,000,000
Other purposes		$ 51,000,000
Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Average life of investment grade debt securities, years	12 years
United States [Member]
Debt Securities, Available-for-sale [Line Items]
Securities issued by U.S. government percentage	90.00%
CMO/REMIC
Debt Securities, Available-for-sale [Line Items]
Investment contractual cash flows guaranteed by Government, percentage	100.00%
Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Total investment portfolio representing municipal bonds, percentage	9.70%

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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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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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