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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net realized gains (losses) on sale of securities | $ 403 | $ 803 | $ (2,093) | $ 2,450
Income taxes | (13,787) | (6,635) | (40,595) | (41,354)
NET INCOME | 37,380 | 9,964 | 123,519 | 70,539
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Amount Reclassified from Accumulated Other Comprehensive Income (Loss) [Member] | Debt Securities [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net realized gains (losses) on sale of securities | (10) | 803 | (2,807) | 2,450
Income taxes | 2 | (308) | 683 | (938)
NET INCOME | $ (8) | $ 495 | $ (2,124) | $ 1,512

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