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Investment Securities - Summary of Interest Income Earned on Investment Securities (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Net Investment Income [Line Items] |  |  |  |
Total interest income from available-for-sale securities | $ 18,543 | $ 9,813 | $ 48,417 | $ 28,382
Total interest income from held-to-maturity securities | 12,834 | 5,188 | 35,211 | 14,258
Total investment income | 31,377 | 15,001 | 83,628 | 42,640
Investment securities available-for-sale [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Taxable | 18,371 | 9,630 | 47,883 | 27,824
Tax-advantaged | 172 | 183 | 534 | 558
Total interest income from available-for-sale securities | 18,543 | 9,813 | 48,417 | 28,382
Investment securities held-to-maturity [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Taxable | 10,845 | 4,099 | 29,927 | 10,917
Tax-advantaged | 1,989 | 1,089 | 5,284 | 3,341
Total interest income from held-to-maturity securities | $ 12,834 | $ 5,188 | $ 35,211 | $ 14,258

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