Securities - Additional Information (Detail) $ in Thousands	6 Months Ended
Jun. 30, 2024 USD ($) Holding	Jun. 30, 2023 USD ($)	Dec. 31, 2023 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	$ 13,091		$ 12,320
Other assets	411,606		388,561
Proceeds from sale of available-for-sale securities	0	$ 28,317
Net unrealized losses on available-for-sale securities included in AOCI	241,600		233,200
Accrued interest receivable	79,759		77,435
Federal home loan bank stock, Total	67,200		62,000
Asset Pledged as Security
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Other assets	2,000,000		2,100,000
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	8,600		8,800
Grantor Trusts [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Equities securities	$ 10,600		$ 9,700

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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