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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, 2022 | Mar. 31, 2021
Net Investment Income [Line Items] |  |
Investment securities available-for-sale | $ 12,832 | $ 9,159
Total interest income from held-to-maturity securities | 10,663 | 3,940
Total investment income | 23,495 | 13,099
Investment securities available-for-sale [Member] |  |
Net Investment Income [Line Items] |  |
Taxable | 12,649 | 8,968
Tax-advantaged | 183 | 191
Investment securities available-for-sale | 12,832 | 9,159
Investment securities held-to-maturity [Member] |  |
Net Investment Income [Line Items] |  |
Taxable | 9,105 | 2,811
Tax-advantaged | 1,558 | 1,129
Total interest income from held-to-maturity securities | $ 10,663 | $ 3,940

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