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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

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