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Investment Securities - Summary of Interest Income Earned on Investment Securities (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Net Investment Income [Line Items] |  |
Investment securities available-for-sale | $ 19,596 | $ 12,832
Total interest income from held-to-maturity securities | 13,956 | 10,663
Total investment income | 33,552 | 23,495
Investment securities available-for-sale [Member] |  |
Net Investment Income [Line Items] |  |
Taxable | 19,428 | 12,649
Tax-advantaged | 168 | 183
Investment securities available-for-sale | 19,596 | 12,832
Investment securities held-to-maturity [Member] |  |
Net Investment Income [Line Items] |  |
Taxable | 11,507 | 9,105
Tax-advantaged | 2,449 | 1,558
Total interest income from held-to-maturity securities | $ 13,956 | $ 10,663

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