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Summary of Significant Accounting Policies - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax [Abstract] |  |  |
Net unrealized gain (loss) on available-for-sale securities | $ 10,781 | $ (44,366) | $ (10,948)
Reclassification adjustment for (gain) loss on sale of available-for-sale securities | 891 |  | (293)
Net unrealized gain (loss) on available-for-sale securities | 11,672 | (44,366) | (11,241)
Tax expense (benefit) | 2,451 | (9,317) | (2,360)
Other comprehensive income (loss) | $ 9,221 | $ (35,049) | $ (8,881)

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