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Comprehensive Income and Accumulated Other Comprehensive Income - Reclassification Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net realized gains (losses) on investments | $ 163 | $ (82) | $ 1,155 | $ (23)
Income before income taxes | 29,391 | 22,169 | 42,632 | 45,978
Income tax expense | (5,443) | (4,279) | (7,884) | (8,688)
Net income | 23,948 | 17,890 | 34,748 | 37,290
Unrealized Gains (losses) on Available-for-Sale Securities [Member] | Reclassification Out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net realized gains (losses) on investments | 133 | 26 | 514 | (105)
Income before income taxes | 133 | 26 | 514 | (105)
Income tax expense | (28) | (5) | (108) | 22
Net income | $ 105 | $ 21 | $ 406 | $ (83)

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