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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