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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income before income taxes | $ 24,460 | $ 23,556 | $ 64,804 | $ 64,440
Income tax expense | (4,759) | (6,979) | (11,978) | (18,858)
Net income | 19,701 | 16,577 | 52,826 | 45,582
Unrealized Gains on Available-for-Sale Securities [Member] | Reclassification Out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Unrealized gains (losses) on available-for-sale securities | (32) | 312 | (445) | 780
Income before income taxes | (32) | 312 | (445) | 780
Income tax expense | 7 | (109) | 40 | (273)
Net income | $ (25) | $ 203 | $ (405) | $ 507

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