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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, 2018 | Mar. 31, 2017
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |
Income before income taxes | $ 19,414 | $ 18,733
Income tax expense | (3,245) | (5,209)
Net income | 16,169 | 13,524
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 on available-for- sale securities | 17 | 40
Income before income taxes | 17 | 40
Income tax expense | (57) | (14)
Net income | $ (40) | $ 26

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