Investment Securities - Summary of Interest Income Earned on Investment Securities (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Net Investment Income [Line Items]
Investment securities available-for-sale	$ 23,229	$ 18,299	$ 42,629	$ 37,033
Total interest income from held-to-maturity securities	12,322	12,886	24,788	25,907
Total interest income from investment securities	35,551	31,185	67,417	62,940
Investment securities available-for-sale [Member]
Net Investment Income [Line Items]
Taxable	23,083	18,154	42,338	36,744
Tax-advantaged	146	145	291	289
Investment securities available-for-sale	23,229	18,299	42,629	37,033
Investment securities held-to-maturity [Member]
Net Investment Income [Line Items]
Taxable	10,037	10,537	20,208	21,196
Tax-advantaged	2,285	2,349	4,580	4,711
Total interest income from held-to-maturity securities	$ 12,322	$ 12,886	$ 24,788	$ 25,907

Interest income from available for sale securities.

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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.

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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.

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