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Business Combinations - Schedule of Supplemental Pro Forma Financial Information (Detail) - Sun Bancorp, Inc. - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Earnings per share, Actual: |  |
Net interest income, Pro forma | $ 184,887 | $ 181,572
Provision for loan losses, Pro forma | 2,984 | 2,199
Non-interest income, Pro forma | 26,894 | 29,590
Non-interest expense, Pro forma | 164,538 | 146,154
Net income, Pro forma | $ 35,575 | $ 45,027
Earnings per share, Pro forma: |  |
Fully diluted, Pro forma (in usd per share) | $ 0.74 | $ 0.93

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