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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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Net Investment Income [Line Items] |  |  |  |
Investment securities available-for-sale | $ 19,356 | $ 17,042 | $ 38,952 | $ 29,874
Total interest income from held-to-maturity securities | 13,740 | 11,714 | 27,696 | 22,377
Total interest income from investment securities | 33,096 | 28,756 |  | 52,251
Investment securities available-for-sale [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Taxable | 19,187 | 16,863 | 38,615 | 29,512
Tax-advantaged | 169 | 179 | 337 | 362
Investment securities available-for-sale |  |  | 38,952 |
Investment securities held-to-maturity [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Taxable | 11,293 | 9,978 | 22,800 | 19,082
Tax-advantaged | 2,447 | 1,736 | 4,896 | 3,295
Total interest income from held-to-maturity securities | $ 13,740 | $ 11,714 | 27,696 | $ 22,377
Total interest income from investment securities |  |  | $ 66,648 |

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