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Business Combinations - Business Acquisition Pro Forma Information (Detail) - Community Bank [Member] - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2019
Business Acquisitions ProForma Information [Line Items] |  |
Total revenues (net interest income plus noninterest income) | $ 121,406 | $ 244,379
Net income | $ 46,960 | $ 93,651
Earnings per share - basic | $ 0.34 | $ 0.67
Earnings per share - diluted | $ 0.33 | $ 0.67

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