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Acquisitions (Summary of Proforma Combined) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
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