Investment Securities - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
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	23 years
Total deposits	$ 11,433,642	12,836,245
Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Average life of investment grade debt securities, years	12 years 9 months 18 days
United States [Member]
Debt Securities, Available-for-sale [Line Items]
Securities issued by U.S. government percentage	91.00%
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	9.10%
Securities Investment [Member]
Debt Securities, Available-for-sale [Line Items]
Pledged to secure amount	$ 2,260,000	1,560,000
Total deposits	1,380,000	1,130,000
Pledged to secure unused borrowing capacity	3,020,000	3,150,000
Secure Public Funds	372,500	652,000
Outstanding borrowings	1,800,000	550,000
Secured unused borrowing capacity	796,000	105,000
Other purposes	$ 51,000	$ 27,000

Average life of investment grade debt securities.

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Debt securities weighted average remaining contractual maturity term.

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Investment contractual cash flows guaranteed by government.

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Investment securities for other purposes

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Outstanding Borrowings

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Percentage of total investment portfolio representing municipal bonds.

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Pledged to secure

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Pledged To Secure Unused Borrowing Capacity

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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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Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.

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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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Amount before tax of other than temporary impairment (OTTI) on investment in held-to-maturity debt security, recognized in other comprehensive loss, attributable to parent entity.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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