Securities - Additional Information (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2024 USD ($) Holding	Dec. 31, 2023 USD ($) Holding	Dec. 31, 2022 USD ($)
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	$ 13,427	$ 12,320
Other assets	385,390	388,561
Proceeds from sale of available-for-sale securities	0	30,987	$ 0
Net unrealized losses on available-for-sale securities included in AOCI	223,800	233,200	$ 261,800
Accrued interest receivable	78,324	77,435
Federal home loan bank stock, Total	48,200	62,000
Asset Pledged as Security
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Other assets	2,200,000	2,100,000
Held-to-maturity Securities [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Accrued interest receivable	8,400	$ 8,800
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
Grantor Trusts [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Equities securities	$ 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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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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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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