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Acquisitions - Narrative (Details) - USD ($)
Apr. 01, 2017
Oct. 01, 2016
Jun. 01, 2016
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Feb. 29, 2016
Business Acquisition [Line Items]                
Goodwill resulting from acquisition       $ 15,272,000   $ 10,989,000    
Acquisition related expenses       $ 1,589,000   933,000    
HCB and Subsidiary                
Business Acquisition [Line Items]                
Percentage of ownership acquired   100.00%            
Price paid in acquisition (in USD per share)               $ 38.00
Value of assets acquired             $ 123,000,000  
Value of liabilities acquired             $ 107,000,000  
Goodwill resulting from acquisition   $ 4,820,000            
HCB and Subsidiary | Core Deposits                
Business Acquisition [Line Items]                
Weighted average life of intangibles acquired   16 years            
First Century Bankshares, Inc [Member]                
Business Acquisition [Line Items]                
Percentage of ownership acquired 100.00%              
Price paid in acquisition (in USD per share)     $ 22.50          
Value of assets acquired $ 406,154,000       $ 406,000,000      
Value of liabilities acquired 360,942,000       $ 361,000,000      
Goodwill resulting from acquisition $ 4,250,000              
Acquisition related expenses           5,460,000    
Value of consideration (in shares) 1,537,912   1.2433          
Percent of cash to be received in business combination     35.00%          
Percent of stock to be received in business combination     65.00%          
First Century Bankshares, Inc [Member] | Core Deposits                
Business Acquisition [Line Items]                
Weighted average life of intangibles acquired 15 years              
Highland County Bankshares, Inc [Member]                
Business Acquisition [Line Items]                
Value of assets acquired   $ 122,840,000            
Value of liabilities acquired   107,239,000            
Acquisition related expenses           $ 405,000    
Stock Consideration [Member] | First Century Bankshares, Inc [Member]                
Business Acquisition [Line Items]                
Consideration paid in acquisition $ 33,100,000              
Cash Consideration [Member] | HCB and Subsidiary                
Business Acquisition [Line Items]                
Consideration paid in acquisition   $ 21,800,000            
Cash Consideration [Member] | First Century Bankshares, Inc [Member]                
Business Acquisition [Line Items]                
Consideration paid in acquisition $ 15,000,000