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Investment Securities - Schedule of Income Earned on Securities (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Investment Income [Line Items] |  |  |
Income earned on securities, taxable | $ 125,765 | $ 138,575 | $ 91,933
Income earned on securities, tax-exempt | 30,980 | 31,618 | 28,356
Total | 156,745 | 170,193 | 120,289
Available-for-sale |  |  |
Investment Income [Line Items] |  |  |
Income earned on securities, taxable | 95,940 | 108,650 | 71,352
Income earned on securities, tax-exempt | 18,586 | 19,104 | 19,168
Held-to-maturity |  |  |
Investment Income [Line Items] |  |  |
Income earned on securities, taxable | 29,825 | 29,925 | 20,581
Income earned on securities, tax-exempt | $ 12,394 | $ 12,514 | $ 9,188

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