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Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income tax expense (benefit) | $ 3,541 | $ 3,125 | $ 5,221 | $ 8,605
Unrealized Gains and Losses on Available for Sale Securities |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total before tax | (27) | (801) | (48) | (833)
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total reclassifications, net of tax | 28 | 633 | 51 | 665
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains and Losses on Available for Sale Securities |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other net realized investment losses | 27 | 801 | 48 | 833
Income tax expense (benefit) | $ 1 | $ (168) | $ 3 | $ (168)

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