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Other Comprehensive Income (Loss) - Reclassifications Adjustment for Gains (Losses) Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Net realized gains (losses) on investments | $ 168 |  | $ (1,605) |  | $ 467 | $ (13,130)
Income taxes | (7,556) |  | (13,637) |  | (15,073) | (27,233)
NET INCOME | 19,882 | $ 20,067 | 37,293 | $ 40,148 | 39,949 | 77,441
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Net realized gains (losses) on investments | 168 |  | (36) |  | 467 | 109
Income taxes | (41) |  | 10 |  | (115) | (27)
NET INCOME | $ 127 |  | $ (26) |  | $ 352 | $ 82

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