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Acquisitions (Narrative) (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 03, 2017
USD ($)
$ / shares
shares
Jul. 15, 2016
USD ($)
May 05, 2016
USD ($)
shares
Jan. 02, 2016
USD ($)
shares
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]              
Shares issued pursuant to acquisition         $ 114,478 $ 1,500  
Goodwill         142,872 67,528 $ 75,042
Premises and equipment sold         21  
Allowance for loan losses         23,546 26,648 23,781
Total assets         4,441,846 3,382,966 3,614,862
Total deposits         3,629,170 2,826,821 2,947,353
Total loans         $ 3,289,355 $ 2,539,353 $ 2,710,712
Closing stock price | $ / shares $ 30.13            
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          
Carolina Bank [Member]              
Business Acquisition [Line Items]              
Payments for acquisition $ 25,279            
Shares issued pursuant to acquisition, shares | shares 3,799,471            
Shares issued pursuant to acquisition $ 114,478            
Goodwill 67,830            
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%            
Carolina Bank [Member] | Pre Tax [Member]              
Business Acquisition [Line Items]              
Merger Related Expenses $ 4,600            
Carolina Bank [Member] | After Tax [Member]              
Business Acquisition [Line Items]              
Merger Related Expenses $ 3,100            
Basic and Diluted | $ / shares $ 0.12            
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