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Acquisitions (Narrative) (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Oct. 01, 2017
USD ($)
$ / shares
shares
Sep. 01, 2017
USD ($)
shares
Mar. 03, 2017
USD ($)
$ / shares
shares
Mar. 03, 2017
USD ($)
$ / shares
Jul. 15, 2016
USD ($)
May 05, 2016
USD ($)
shares
Jan. 02, 2016
USD ($)
shares
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]                      
Shares issued pursuant to acquisition                 $ 284,192 $ 5,509  
Goodwill                 233,070 75,042  
Loans sold                 77,034 20,021
Premises and equipment sold                 151 2,025 $ 1,621
Core deposit intangible $ 9,760   $ 8,790 $ 8,790 $ 1,170            
Total assets                 5,547,037 3,614,862  
Total deposits                 4,406,955 2,947,353  
Total loans                 4,042,369 $ 2,710,712  
Asheville Savings Bank [Member]                      
Business Acquisition [Line Items]                      
Payments for acquisition $ 17,900                    
Shares issued pursuant to acquisition, shares | shares 4,920,061                    
Shares issued pursuant to acquisition $ 169,300                    
Goodwill 88,400                    
Premises and equipment 10,697                    
Other liabilities 8,943                    
Core deposit intangible                    
Payments for acquisition per share | $ / shares $ 41.90                    
Merger share conversion ratio 1.44                    
Contribution of cash in total consideration 10.00%                    
Contribution of stock in total consideration 90.00%                    
Closing stock price | $ / shares $ 34.41                    
Asheville Savings Bank [Member] | Post Merger [Member]                      
Business Acquisition [Line Items]                      
Merger Related Expenses                 2,700    
Asheville Savings Bank [Member] | Pre Merger [Member]                      
Business Acquisition [Line Items]                      
Merger Related Expenses                 20,400    
Asheville Savings Bank [Member] | Deposit Liabilities [Member]                      
Business Acquisition [Line Items]                      
Useful life of acquired intangible assets 5 years                    
Bankingport, Inc. [Member]                      
Business Acquisition [Line Items]                      
Total purchase price             $ 2,200        
Payments for acquisition             $ 700        
Shares issued pursuant to acquisition, shares | shares             79,012        
Shares issued pursuant to acquisition             $ 1,500        
Payment for purchase of office space             1,100        
Goodwill             1,700        
Other amortizable intangible assets             $ 700        
SBA Complete, Inc. [Member]                      
Business Acquisition [Line Items]                      
Total purchase price           $ 8,500          
Payments for acquisition           $ 1,500          
Shares issued pursuant to acquisition, shares | shares           199,829          
Shares issued pursuant to acquisition           $ 4,000          
Goodwill           5,600          
Other amortizable intangible assets           2,000          
Earn-out liability           $ 3,000          
Earn-out liability payment period           3 years          
Measurement period adjustment for earn-out liability and goodwill               $ 1,200      
First Community Bank branches [Member]                      
Business Acquisition [Line Items]                      
Goodwill         5,400            
Loans sold         150,600            
Premises and equipment sold         5,700            
Deposits sold         134,300            
Deposit premium         3,800            
Allowance for loan losses         1,000            
Write off of goodwill         3,500            
Gain loss on acquisition         1,500            
Acquired assets fair value         157,200            
Premises and equipment         3,400            
Other liabilities         200            
Discount on acquired loans         1,500            
Premium on deposits         300            
Core deposit intangible         1,200            
Total deposits         111,300            
Total loans         $ 152,200            
Carolina Bank [Member]                      
Business Acquisition [Line Items]                      
Payments for acquisition     $ 25,300                
Shares issued pursuant to acquisition, shares | shares     3,799,471                
Shares issued pursuant to acquisition     $ 114,500                
Goodwill     65,516 65,516              
Premises and equipment     17,967 17,967              
Other liabilities     12,855 12,855              
Core deposit intangible                  
Payments for acquisition per share | $ / shares     $ 20.00 $ 20.00              
Merger share conversion ratio     1.002                
Contribution of cash in total consideration     25.00% 25.00%              
Contribution of stock in total consideration     75.00% 75.00%              
Closing stock price | $ / shares     $ 30.13 $ 30.13              
Carolina Bank [Member] | Post Merger [Member]                      
Business Acquisition [Line Items]                      
Merger Related Expenses                 5,200    
Carolina Bank [Member] | Pre Merger [Member]                      
Business Acquisition [Line Items]                      
Merger Related Expenses                 $ 4,600    
Carolina Bank [Member] | Borrowings [Member]                      
Business Acquisition [Line Items]                      
Useful life of acquired intangible assets       18 years              
Carolina Bank [Member] | Deposit Liabilities [Member]                      
Business Acquisition [Line Items]                      
Useful life of acquired intangible assets       5 years              
Carolina Bank [Member] | Core Deposit Intangible [Member]                      
Business Acquisition [Line Items]                      
Useful life of acquired intangible assets       7 years              
Bear Insurance [Member]                      
Business Acquisition [Line Items]                      
Total purchase price   $ 9,800                  
Payments for acquisition   $ 7,900                  
Shares issued pursuant to acquisition, shares | shares   13,374                  
Shares issued pursuant to acquisition   $ 400                  
Goodwill   5,300                  
Other amortizable intangible assets   3,900                  
Annual commission income   4,000                  
Earn-out liability   $ 1,200