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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income before income taxes | $ 20,930 | $ 22,151 | $ 40,344 | $ 40,884
Income tax expense | (3,974) | (6,670) | (7,219) | (11,879)
Net income | 16,956 | 15,481 | 33,125 | 29,005
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 | (762) | 126 | (466) | 286
Income before income taxes | (762) | 126 | (466) | 286
Income tax expense | 160 | (44) | 44 | (100)
Net income | $ (602) | $ 82 | $ (422) | $ 186

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