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Business Combination (Narrative) (Details)
$ in Thousands
May 19, 2017
USD ($)
loan
Mar. 31, 2018
USD ($)
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    
Deposits, acquired 212,456    
Business combination cash received net of deposit premium 64,000    
Business Acquisition, Transaction Costs 977    
Goodwill 14,985    
Cash flows expected to be collected 125,131    
Accretable FMV adjustments $ 2,269    
Business Combination Acquired Loans Contractually Required Payments Receivable Number Of Loans | loan 864    
Business Combination Acquired Loans Contractually Required Payments Receivable $ 125,131    
Business Combination Acquired Loans Accretable Fair Market Value Adjustment $ 2,269