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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net realized gains (losses) on investments | $ 309 | $ (4) | $ 1,464 | $ (27)
Income before income taxes | 28,669 | 26,613 | 71,301 | 72,591
Income tax expense | (5,316) | (5,227) | (13,200) | (13,915)
Net income | 23,353 | 21,386 | 58,101 | 58,676
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 | 737 | (10) | 780 | (764)
Income before income taxes | 737 | (10) | 780 | (764)
Income tax expense | (155) | 2 | (164) | 161
Net income | $ 582 | $ (8) | $ 616 | $ (603)

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