Securities - Additional Information (Detail) $ in Thousands	9 Months Ended
Sep. 30, 2025 USD ($) Holding	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) Holding
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Maximum percentage of equity of one issuer	10.00%
Number of holdings greater than specified percentage of equity \| Holding	0		0
Equities securities	$ 30,374		$ 13,427
Other assets	553,134		385,390
Proceeds from sale of available-for-sale securities	876,893	$ 0
Net unrealized losses on available-for-sale securities included in AOCI	153,400		223,800
Accrued interest receivable	108,865		78,324
Federal home loan bank stock, Total	61,800		48,200
Asset Pledged as Security
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Other assets	2,900,000		2,200,000
Us Government Securities and Mortgage Backed and Collateralized Securities Issued By Direct Governmental Entity or Government-Sponsored Entity [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Estimated credit losses	0
Held-to-maturity Securities [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Accrued interest receivable	8,300		8,400
Grantor Trusts [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Equities securities	$ 27,800		$ 10,900

Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at amortized cost (held-to-maturity).

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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Amount of assets classified as other.

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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The maximum percentage of shareholders' equity of any one issuer other than the U.S. government and its agencies.

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Schedule of available for sale securities and held to maturity.

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