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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Net Investment Income [Line Items] |  |  |  |
Total interest income from available-for-sale securities | $ 20,178 | $ 22,441 | $ 62,849 | $ 61,393
Total interest income from held-to-maturity securities | 13,284 | 13,576 | 40,131 | 41,272
Total interest income from investment securities | 33,462 | 36,017 | 102,980 | 102,665
Investment securities available-for-sale [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Taxable | 20,010 | 22,272 | 62,347 | 60,887
Tax-advantaged | 168 | 169 | 502 | 506
Total interest income from available-for-sale securities | 20,178 | 22,441 | 62,849 | 61,393
Investment securities held-to-maturity [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Taxable | 10,896 | 11,139 | 32,930 | 33,939
Tax-advantaged | 2,388 | 2,437 | 7,201 | 7,333
Total interest income from held-to-maturity securities | $ 13,284 | $ 13,576 | $ 40,131 | $ 41,272

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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/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column E)(Footnote 4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6 + Details
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