Investment Securities - Summary of Interest Income Earned on Investment Securities (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Net Investment Income [Line Items]
Investment securities available-for-sale	$ 29,384	$ 18,867	$ 72,013	$ 55,900
Total interest income from held-to-maturity securities	12,180	12,812	36,968	38,719
Total interest income from investment securities	41,564	31,679	108,981	94,619
Investment securities available-for-sale [Member]
Net Investment Income [Line Items]
Taxable	29,237	18,722	71,575	55,466
Tax-advantaged	147	145	438	434
Investment securities available-for-sale	29,384	18,867	72,013	55,900
Investment securities held-to-maturity [Member]
Net Investment Income [Line Items]
Taxable	9,926	10,494	30,134	31,690
Tax-advantaged	2,254	2,318	6,834	7,029
Total interest income from held-to-maturity securities	$ 12,180	$ 12,812	$ 36,968	$ 38,719

Interest income from available for sale securities.

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- Definition

Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on securities.

+ References

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Amount of operating interest income, including amortization and accretion of premiums and discounts, on held-to-maturity securities.

+ References

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

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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