Investment Securities - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Investment in FHLB stock, impairment losses	$ 0
Debt securities weighted average remaining contractual maturity term	23 years
Total deposits	$ 11,894,921	$ 11,433,642
Debt Securities, Held-to-Maturity, Allowance for Credit Loss	$ 0	0
United States [Member]
Debt Securities, Available-for-Sale [Line Items]
Securities issued by U.S. government percentage	90.00%
Investment Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Investment Securities For Other Purposes	$ 51,000	51,000
Secured unused borrowing capacity	446,000	796,000
Outstanding Borrowings	1,880,000	1,800,000
Secure Public Funds	372,300	372,500
Pledged To Secure Unused Borrowing Capacity	2,750,000	3,020,000
Total deposits	1,370,000	1,380,000
Pledged To Secure	$ 2,510,000	$ 2,260,000

Debt securities weighted average remaining contractual maturity term.

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Investment securities for other purposes

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Outstanding Borrowings

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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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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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