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Acquisitions Acquisitions (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
Jan. 01, 2019
Jul. 24, 2018
Mar. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Goodwill     $ 17,127 $ 15,272
Peoples Bankshares Inc [Member]        
Business Acquisition [Line Items]        
Business Acquisition, Percentage of Voting Interests Acquired 100.00%      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets $ 133,086     133,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities $ 113,486     $ 113,000
Business Acquisition, Share Price   $ 47.00    
Business Acquisition, Share Price, Number Of Shares 465,931 1.7193    
Business Acquisition Combination of Equity and Cash, Cash   50.00%    
Business Acquisition Combination of Equity and Cash, Common Stock   50.00%    
Goodwill $ 1,860      
Stock Consideration [Member] | Peoples Bankshares Inc [Member]        
Business Acquisition [Line Items]        
Business Combination, Consideration Transferred 9,000      
Cash Consideration [Member] | Peoples Bankshares Inc [Member]        
Business Acquisition [Line Items]        
Business Combination, Consideration Transferred $ 12,700      
Core Deposits [Member] | Peoples Bankshares Inc [Member]        
Business Acquisition [Line Items]        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 15 years