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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
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Mar. 31, 2019 | Mar. 31, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |
Unrealized gains (losses) on available-for-sale securities | $ 2,200 | $ (400)
Income before income taxes | 23,809 | 19,414
Income tax expense | (4,409) | (3,245)
Net income | 19,400 | 16,169
Unrealized Gains (losses) 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 | (14) | 17
Income before income taxes | (14) | 17
Income tax expense | 3 | (57)
Net income | $ (11) | $ (40)

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