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Acquisitions (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 03, 2017
USD ($)
$ / shares
shares
Jul. 15, 2016
USD ($)
May 05, 2016
USD ($)
shares
Jan. 02, 2016
USD ($)
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]              
Shares issued pursuant to acquisition         $ 5,509    
Goodwill         75,042 $ 65,835  
Premises and equipment sold         2,025 1,621 $ 1,309
Allowance for loan losses         23,781 28,583  
Total assets         3,614,862 3,362,065  
Total deposits         2,947,353 2,811,285  
Total loans         $ 2,710,712 $ 2,518,926  
Carolina Bank [Member] | Subsequent Event [Member]              
Business Acquisition [Line Items]              
Total purchase price $ 25,300            
Shares issued pursuant to acquisition, shares | shares 3,800,000            
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%            
Total assets $ 705,000            
Total deposits 530,000            
Total loans $ 598,000            
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        
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