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Loan Quality (Troubled Debt Restructuring Loans) (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
USD ($)
contract
Sep. 30, 2015
contract
Dec. 31, 2015
USD ($)
contract
Financing Receivable, Modifications [Line Items]      
Troubled Debt Restructurings: Number of Contracts | contract 17   15
Troubled Debt Restructurings: Recorded Investment $ 13,576   $ 13,281
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Number of Contracts | contract 1  
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Recorded Investment $ 1,281  
Troubled Debt Restructurings, New During Period, Number of Contracts | contract   0  
New During Period, Number of Contracts | contract 2    
New During Period, Pre-TDR Modification $ 763    
New During Period, After-TDR Modification 763    
New During Period, Recorded Investment 753    
Performing [Member]      
Financing Receivable, Modifications [Line Items]      
Troubled Debt Restructurings: Recorded Investment [1] 12,144   13,130
Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Troubled Debt Restructurings: Recorded Investment [1] $ 1,432   $ 151
Residential Real Estate - Construction [Member]      
Financing Receivable, Modifications [Line Items]      
Troubled Debt Restructurings: Number of Contracts | contract 1   1
Troubled Debt Restructurings: Recorded Investment $ 486   $ 502
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Number of Contracts | contract  
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Recorded Investment  
Residential Real Estate - Construction [Member] | Performing [Member]      
Financing Receivable, Modifications [Line Items]      
Troubled Debt Restructurings: Recorded Investment [1] $ 486   $ 502
Residential Real Estate [Member]      
Financing Receivable, Modifications [Line Items]      
Troubled Debt Restructurings: Number of Contracts | contract 5   4
Troubled Debt Restructurings: Recorded Investment $ 879   $ 654
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Number of Contracts | contract  
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Recorded Investment  
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 238    
Residential Real Estate [Member] | Performing [Member]      
Financing Receivable, Modifications [Line Items]      
Troubled Debt Restructurings: Recorded Investment [1] 728   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 | contract 11   10
Troubled Debt Restructurings: Recorded Investment $ 12,211   $ 12,125
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Number of Contracts | contract 1  
Troubled Debt Restructurings That Have Defaulted on Modified Terms YTD: Recorded Investment $ 1,281  
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 515    
Commercial Real Estate [Member] | Performing [Member]      
Financing Receivable, Modifications [Line Items]      
Troubled Debt Restructurings: Recorded Investment [1] 10,930   $ 12,125
Commercial Real Estate [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Troubled Debt Restructurings: Recorded Investment [1] $ 1,281    
[1] The performing status is determined by the loan's compliance with the modified terms.