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Acquisitions (Narrative) (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 01, 2017
USD ($)
shares
Mar. 03, 2017
USD ($)
$ / shares
shares
Jul. 15, 2016
USD ($)
May 05, 2016
USD ($)
shares
Jan. 02, 2016
USD ($)
shares
Jun. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]                  
Shares issued pursuant to acquisition             $ 114,893 $ 5,509  
Goodwill             144,667 75,392 $ 75,042
Premises and equipment sold             114 21  
Allowance for loan losses             24,593 24,575 23,781
Total assets             4,591,147 3,537,480 3,614,862
Total deposits             3,651,241 2,910,840 2,947,353
Total loans             3,429,755 $ 2,651,459 $ 2,710,712
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   $ 114,478              
Goodwill   65,516              
Premises and equipment   17,967              
Other liabilities   12,855              
Core deposit intangible                
Payments for acquisition per share | $ / shares   $ 20.00              
Merger share conversion ratio   1.002              
Contribution of cash in total consideration   25.00%              
Contribution of stock in total consideration   75.00%              
Closing stock price | $ / shares   $ 30.13              
Carolina Bank [Member] | Post Merger [Member]                  
Business Acquisition [Line Items]                  
Merger Related Expenses             4,400    
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