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Loans and Allowance for Loan and Lease Losses (Narrative) (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
Loan
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Loan
Dec. 31, 2013
Loan
Dec. 31, 2009
Loan
Dec. 31, 2008
Loan
Financing Receivable, Allowance for Credit Losses [Line Items]            
Financing Receivable Deferred Fees And Costs $ 196,000 $ 178,000        
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans 666,000 778,000 $ 798,000      
Loans and Leases Receivable, Impaired, Commitment to Lend 0          
Financing Receivable, Modifications, Recorded Investment 3,515,000 2,805,000        
Charge-offs associated with troubled debt restructured loans $ 0 0        
Number of troubled debt restructured loans | Loan 0          
Loans to certain executive officers, directors, and their related interests $ 17,594,000 10,657,000        
Loans to certain executive officers, directors, and their related interests, new loans and advances 14,479,000          
Loans to certain executive officers, directors, and their related interests, Repayments 7,542,000          
Accruing [Member] | Five Loans [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Financing Receivable, Modifications, Recorded Investment 877,000          
Accruing [Member] | Four Borrowers [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Financing Receivable, Modifications, Recorded Investment   459,000        
Nonaccruing [Member] | Ten Loans With Four Relationships [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Financing Receivable, Modifications, Recorded Investment 2,638,000          
Nonaccruing [Member] | Two Large Relationships [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Financing Receivable, Modifications, Recorded Investment 2,170,000          
Nonaccruing [Member] | Nine Loans Four Related Borrowers [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Financing Receivable, Modifications, Recorded Investment   2,346,000        
Nonaccruing [Member] | One of Four Relationships Borrowers [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Financing Receivable, Modifications, Recorded Investment   1,370,000        
Residential Mortgage [Member] | Consumer Portfolio [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Financing Receivable, Modifications, Recorded Investment 639,000 555,000        
Residential Mortgage [Member] | Consumer Portfolio [Member] | Accruing [Member] | Four Unrelated Borrowers [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Financing Receivable, Modifications, Recorded Investment 571,000          
Residential Mortgage [Member] | Consumer Portfolio [Member] | Accruing [Member] | Three of Four Unrelated Borrowers [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Financing Receivable, Modifications, Recorded Investment   64,000        
Commercial Real Estate [Member] | Commercial Portfolio [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Financing Receivable, Modifications, Recorded Investment 2,871,000 2,235,000        
Commercial Real Estate [Member] | Commercial Portfolio [Member] | Accruing [Member] | Other Borrower [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Financing Receivable, Modifications, Recorded Investment $ 306,000 $ 395,000        
Under Forbearance Agreement 2016 Period [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Number of forbearance agreements negotiated | Loan 3   1 2 8 1
Under Forbearance Agreement 2015 Period [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Number of forbearance agreements negotiated | Loan     1 2 9 1