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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (loss) Pre-Tax and After-Tax (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
After-tax |  |  |
Other comprehensive income (loss) | $ 29,610 | $ (88,214) | $ (18,911)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent |  |  |
Pre-tax |  |  |
Unrealized holding gains (losses) arising during the period | 37,793 | (118,832) | (24,477)
Less: Reclassification adjustments (gains) losses realized in net income | 1,490 | 1,818 | (215)
Other comprehensive income (loss) | 39,283 | (117,014) | (24,692)
Tax |  |  |
Unrealized holding gains (losses) arising during the period | 9,306 | (29,247) | (5,731)
Less: Reclassification adjustments (gains) losses realized in net income | 367 | 447 | (50)
Other comprehensive income (loss) | 9,673 | (28,800) | (5,781)
After-tax |  |  |
Unrealized holding gains (losses) arising during the period | 28,487 | (89,585) | (18,746)
Less: Reclassification adjustments (gains) losses realized in net income | 1,123 | 1,371 | (165)
Other comprehensive income (loss) | $ 29,610 | $ (88,214) | $ (18,911)

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