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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income before income taxes $ 24,615 $ 20,112 $ 59,010 $ 41,309
Income tax expense (7,976) (5,793) (18,114) (11,860)
Net income 16,639 14,319 40,896 29,449
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 549 1,273 406 261
Other-than-temporary impairment   (2,126)   (1,600)
Income before income taxes 549 (853) 406 (1,339)
Income tax expense (192) 299 (142) 469
Net income $ 357 $ (554) $ 264 $ (870)