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Business Combinations - Business Acquisition Pro Forma Information (Detail) - Community Bank [Member] - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Business Acquisitions Pro Forma Information [Line Items] |  |
Total revenues (net interest income plus noninterest income) | $ 364,846 | $ 354,990
Net Income | $ 138,274 | $ 118,419
Earnings per share-basic | $ 0.99 | $ 0.85
Earnings per share-diluted | $ 0.99 | $ 0.85

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