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Loans and Allowance for Loan and Lease Losses (Narrative) (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Loan
Jun. 30, 2017
USD ($)
Loan
Jun. 30, 2018
USD ($)
Loan
Jun. 30, 2017
USD ($)
Loan
Dec. 31, 2017
USD ($)
Loan
Financing Receivable, Allowance for Credit Losses [Line Items]          
Contractual payment of principal or interest past due period for discontinuing accrual of interest     90 days    
Financing Receivable Deferred Fees And Costs $ 479,000   $ 479,000   $ 464,000
Past Due 9,879,000   9,879,000   10,749,000
Financing Receivable, Modifications, Recorded Investment 6,839,000   6,839,000   9,571,000
Charge-offs associated with troubled debt restructured loans $ 0 $ 0 $ 0 $ 0 $ 66,000
Number of troubled debt restructured loans, defaulted | Loan 0 0 0 0 0
Number of troubled debt restructured loans | Loan 0 0 0 0  
Other Real Estate $ 912,000   $ 912,000   $ 42,000
Number of consumer mortgage loans foreclosure proceedings in process | Loan     4    
Loans for which formal foreclosure proceedings are in process 274,000   $ 274,000   308,000
Home Equity Loan [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Recorded Investment 3,000   3,000   4,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Past Due 6,230,000   6,230,000   4,831,000
Accruing [Member] | Four Loans [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Recorded Investment 531,000   531,000   544,000
Accruing [Member] | Home Equity Loan [Member] | Other Borrower          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Recorded Investment 3,000   3,000   4,000
Accruing [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Past Due 0   0   0
Nonaccruing [Member] | Nine Loans With Five Relationships [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Recorded Investment 6,308,000   6,308,000    
Nonaccruing [Member] | Two Large Relationships [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Recorded Investment 5,747,000   5,747,000   7,284,000
Nonaccruing [Member] | Fifteen Loans With Five Relationships          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Recorded Investment 6,308,000   6,308,000    
Nonaccruing [Member] | Fifteen Loans With Seven Relationships [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Recorded Investment         9,027,000
Reserve for Off-balance Sheet Activities [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Valuation Allowances and Reserves, Balance $ 108,000   $ 108,000   105,000
Maximum [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Non-residential consumer loans charged off on contractual basis in event of bankruptcy, in period     120 days    
Maximum [Member] | Home equity lines of credit [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loan Terms     20 years    
Loan To Value Ratio 85.00%   85.00%    
Maximum [Member] | Home Equity Lines Of Credit [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loan Terms     5 years    
Commercial [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loan Terms     1 year    
Loan To Value Ratio 80.00%   80.00%    
Residential Portfolio [Member] | Residential Mortgage [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Recorded Investment $ 528,000   $ 528,000   540,000
Residential Portfolio [Member] | Residential Mortgage [Member] | Accruing [Member] | Three Unrelated Borrowers          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Recorded Investment $ 528,000   $ 528,000   $ 540,000
Residential Portfolio [Member] | Maximum [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loan Terms     30 years    
Loan To Value Ratio 100.00%   100.00%    
Loan To Value Ratio, Exposure After Private Mortgage Insurance     85.00%