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Loan Quality (Troubled Debt Restructuring Loans) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
loan
contract
Dec. 31, 2015
USD ($)
contract
Financing Receivable, Modifications [Line Items]    
Troubled Debt Restructurings: Number of Contracts 17 15
Troubled Debt Restructurings: Recorded Investment $ 13,419 $ 13,281
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Number of Contracts | loan 2  
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Recorded Investment $ 1,401  
New During Period, Number of Contracts | contract 2 0
New During Period, Pre-TDR Modification $ 763  
New During Period, After-TDR Modification 763  
New During Period, Recorded Investment 750  
Performing [Member]    
Financing Receivable, Modifications [Line Items]    
Troubled Debt Restructurings: Recorded Investment [1] 12,018 $ 13,130
Nonperforming [Member]    
Financing Receivable, Modifications [Line Items]    
Troubled Debt Restructurings: Recorded Investment [1] $ 1,401 $ 151
Residential Real Estate - Construction [Member]    
Financing Receivable, Modifications [Line Items]    
Troubled Debt Restructurings: Number of Contracts 1 1
Troubled Debt Restructurings: Recorded Investment $ 480 $ 502
Residential Real Estate - Construction [Member] | Performing [Member]    
Financing Receivable, Modifications [Line Items]    
Troubled Debt Restructurings: Recorded Investment [1] $ 480 $ 502
Residential Real Estate [Member]    
Financing Receivable, Modifications [Line Items]    
Troubled Debt Restructurings: Number of Contracts 5 4
Troubled Debt Restructurings: Recorded Investment $ 875 $ 654
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Number of Contracts | loan 1  
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Recorded Investment $ 151  
New During Period, Number of Contracts | contract 1  
New During Period, Pre-TDR Modification $ 238  
New During Period, After-TDR Modification 238  
New During Period, Recorded Investment 237  
Residential Real Estate [Member] | Performing [Member]    
Financing Receivable, Modifications [Line Items]    
Troubled Debt Restructurings: Recorded Investment [1] 724 503
Residential Real Estate [Member] | Nonperforming [Member]    
Financing Receivable, Modifications [Line Items]    
Troubled Debt Restructurings: Recorded Investment [1] $ 151 $ 151
Commercial Real Estate [Member]    
Financing Receivable, Modifications [Line Items]    
Troubled Debt Restructurings: Number of Contracts | loan 11  
Troubled Debt Restructurings: Recorded Investment $ 12,064  
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Number of Contracts | loan 1  
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Recorded Investment $ 1,250  
New During Period, Number of Contracts | contract 1  
New During Period, Pre-TDR Modification $ 525  
New During Period, After-TDR Modification 525  
New During Period, Recorded Investment 513  
Commercial Real Estate [Member] | Performing [Member]    
Financing Receivable, Modifications [Line Items]    
Troubled Debt Restructurings: Recorded Investment [1] 10,814  
Commercial Real Estate [Member] | Nonperforming [Member]    
Financing Receivable, Modifications [Line Items]    
Troubled Debt Restructurings: Recorded Investment [1] $ 1,250  
Commercial [Member]    
Financing Receivable, Modifications [Line Items]    
Troubled Debt Restructurings: Number of Contracts | contract   10
Troubled Debt Restructurings: Recorded Investment   $ 12,125
Commercial [Member] | Performing [Member]    
Financing Receivable, Modifications [Line Items]    
Troubled Debt Restructurings: Recorded Investment [1]   $ 12,125
[1] The performing status is determined by the loan's compliance with the modified terms.