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Acquisitions (Summary of Proforma Combined) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares
Carolina Bank
Business Acquisition
Net interest income	$ 168,759
Noninterest income	50,098
Total revenue	218,857
Net income available to common shareholders	$ 49,907
Earnings per common share
Basic | $ / shares	$ 1.93
Diluted | $ / shares	$ 1.92
Asheville Savings Bank
Business Acquisition
Net interest income	$ 183,996
Noninterest income	54,523
Total revenue	238,519
Net income available to common shareholders	$ 51,600
Earnings per common share
Basic | $ / shares	$ 1.79
Diluted | $ / shares	$ 1.78

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