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Acquisitions Acquisitions (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
Sep. 17, 2019
Jan. 01, 2019
Jul. 24, 2018
Sep. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]          
Goodwill       $ 12,417 $ 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   $ 1,850      
Cornerstone Financial Services Inc. [Member]          
Business Acquisition [Line Items]          
Business Acquisition, Share Price $ 5,700.00        
Business Acquisition, Share Price, Number Of Shares 228        
Business Acquisition Combination of Equity and Cash, Cash 50.00%        
Business Acquisition Combination of Equity and Cash, Common Stock 50.00%        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets       $ 192,000  
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