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Loans and Allowance for Credit Losses (Narrative) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]    
Deferred fees $ 850 $ 789
Discounts On Acquired Loans 1,300 1,400
Financing receivable, recorded investment, doubtful 0 0
Financing receivable, recorded investment, nonaccrual status 15,360 16,655
Loans and leases receivable, net amount, total 1,201,298 1,185,012
Loans 1,211,716 1,195,355
Other real estate owned, net 979 1,222
Residential Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Financing receivable, recorded investment, nonaccrual status 2,984 4,099
Loans 427,023 429,560
Consumer Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Mortgage loans in process of foreclosure, amount   949
Loans 7,221 7,274
Northwest Bank Branches [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Financing Receivable Net of Allowance 88,900 92,800
Pass Performing [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans 990,777 967,331
Pass Performing [Member] | Residential Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans 386,816 386,553
Pass Performing [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans 6,770 6,805
Pass Watch [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans 185,618 194,540
Pass Watch [Member] | Residential Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans 31,783 33,739
Pass Watch [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans 448 466
Special Mention [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans 12,888 8,926
Special Mention [Member] | Residential Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans 4,245 3,769
Substandard [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans 22,433 24,558
Substandard [Member] | Residential Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans 4,179 5,499
Substandard [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans $ 3 $ 3