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Investment Securities - Summary of Interest Income Earned on Investment Securities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Net Investment Income [Line Items]
Investment securities available-for-sale	$ 18,867	$ 20,178	$ 55,900	$ 62,489
Total interest income from held-to-maturity securities	12,812	13,284	38,719	40,131
Total interest income from investment securities	31,679	33,462	94,619	102,980
Investment securities available-for-sale [Member]
Net Investment Income [Line Items]
Taxable	18,722	20,010	55,466	62,347
Tax-advantaged	145	168	434	502
Investment securities available-for-sale	18,867	20,178	55,900	62,849
Investment securities held-to-maturity [Member]
Net Investment Income [Line Items]
Taxable	10,494	10,896	31,690	32,930
Tax-advantaged	2,318	2,388	7,029	7,201
Total interest income from held-to-maturity securities	$ 12,812	$ 13,284	$ 38,719	$ 40,131

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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.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 21
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-21

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-Topic 946
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-Paragraph 1
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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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