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Business Combination (Narrative) (Details)
$ in Thousands
May 19, 2017
USD ($)
loan
May 19, 2017
USD ($)
loan
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]        
Goodwill     $ 27,618 $ 27,618
Northwest Bank Branches [Member]        
Business Acquisition [Line Items]        
Loans, acquired $ 122,862 $ 122,862    
Business Combination, Consideration Transferred   17,186    
Deposits, acquired 212,456 212,456    
Business combination cash received net of deposit premium 64,000      
Business Acquisition, Transaction Costs 977 977    
Goodwill 14,985 14,985    
Cash flows expected to be collected 125,131 125,131    
Accretable FMV adjustments $ 2,269 $ 2,269    
Business Combination Acquired Loans Contractually Required Payments Receivable Number Of Loans | loan 864 864    
Business Combination Acquired Loans Contractually Required Payments Receivable $ 125,131 $ 125,131    
Business Combination Acquired Loans Accretable Fair Market Value Adjustment $ 2,269 $ 2,269