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Acquisitions (Summary of Proforma Combined) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Carolina Bank [Member] |  |
Business Acquisition [Line Items] |  |
Net interest income | $ 168,759 | $ 147,089
Noninterest income | 50,098 | 36,684
Total revenue | 218,857 | 183,773
Net income available to common shareholders | $ 49,907 | $ 25,364
Earnings per common share |  |
Basic | $ 1.93 | $ 1.07
Diluted | $ 1.92 | $ 1.03
Asheville Savings Bank [Member] |  |
Business Acquisition [Line Items] |  |
Net interest income | $ 183,996 | $ 147,284
Noninterest income | 54,523 | 34,307
Total revenue | 238,391 | 181,591
Net income available to common shareholders | $ 51,600 | $ 12,291
Earnings per common share |  |
Basic | $ 1.79 | $ 0.49
Diluted | $ 1.78 | $ 0.48

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