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Investment Securities - Schedule of Income Earned on Securities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Investment Income [Line Items]
Income earned on securities, taxable	$ 125,765	$ 138,575	$ 91,933
Income earned on securities, tax-exempt	30,980	31,618	28,356
Total	156,745	170,193	120,289
Available-for-sale
Investment Income [Line Items]
Income earned on securities, taxable	95,940	108,650	71,352
Income earned on securities, tax-exempt	18,586	19,104	19,168
Held-to-maturity
Investment Income [Line Items]
Income earned on securities, taxable	29,825	29,925	20,581
Income earned on securities, tax-exempt	$ 12,394	$ 12,514	$ 9,188

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Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities.

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Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities exempt from state, federal and other income tax.

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