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Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net realized gains (losses) on sale of securities $ (2,641) $ (63)
Income taxes (11,644) (16,172)
NET INCOME 40,055 31,199
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 (2,765) (63)
Income taxes 670 24
NET INCOME $ (2,095) $ (39)