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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income before income taxes | $ 22,151 | $ 24,615 | $ 40,884 | $ 59,010
Income tax expense | (6,670) | (7,976) | (11,879) | (18,114)
Net income | 15,481 | 16,639 | 29,005 | 40,896
Changes in Net Unrealized Gains (Losses) on Investment 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 | 126 | 549 | 286 | 406
Income before income taxes | 126 | 549 | 286 | 406
Income tax expense | (44) | (192) | (100) | (142)
Net income | $ 82 | $ 357 | $ 186 | $ 264

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