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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Net Investment Income [Line Items] |  |  |  |
Total interest income from available-for-sale securities | $ 9,410 | $ 8,449 | $ 18,569 | $ 18,498
Total interest income from held-to-maturity securities | 5,130 | 3,660 | 9,070 | 7,658
Total investment income | 14,540 | 12,109 | 27,639 | 26,156
Investment securities available-for-sale [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Taxable | 9,226 | 8,244 | 18,194 | 18,069
Tax-advantaged | 184 | 205 | 375 | 429
Total interest income from available-for-sale securities | 9,410 | 8,449 | 18,569 | 18,498
Investment securities held-to-maturity [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Taxable | 4,007 | 2,447 | 6,818 | 5,145
Tax-advantaged | 1,123 | 1,213 | 2,252 | 2,513
Total interest income from held-to-maturity securities | $ 5,130 | $ 3,660 | $ 9,070 | $ 7,658

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