Investment Securities - Summary of Interest Income Earned on Investment Securities (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Net Investment Income [Line Items]
Investment securities available-for-sale	$ 18,299	$ 21,225	$ 37,033	$ 42,671
Total interest income from held-to-maturity securities	12,886	13,445	25,907	26,847
Total interest income from investment securities	31,185	34,670	62,940	69,518
Investment securities available-for-sale [Member]
Net Investment Income [Line Items]
Taxable	18,154	21,057	36,744	42,337
Tax-advantaged	145	168	289	334
Investment securities available-for-sale	18,299	21,225	37,033	42,671
Investment securities held-to-maturity [Member]
Net Investment Income [Line Items]
Taxable	10,537	11,050	21,196	22,034
Tax-advantaged	2,349	2,395	4,711	4,813
Total interest income from held-to-maturity securities	$ 12,886	$ 13,445	$ 25,907	$ 26,847

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

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
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-Name Accounting Standards Codification
-Section 55
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-Publisher FASB
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Amount of operating interest income, including amortization and accretion of premiums and discounts, on held-to-maturity securities.

+ References

No definition available.

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- Definition

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.

+ References

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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
-Name Regulation S-K (SK)
-Number 229
-Section 1402
-Paragraph a
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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