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Loan Quality and Allowance for Loan Losses (Troubled Debt Restructuring Loans) (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
item
contract
Mar. 31, 2017
item
Dec. 31, 2017
USD ($)
contract
Financing Receivable, Modifications [Line Items]      
Troubled Debt Restructurings: Number of Contracts | contract 17   17
Troubled Debt Restructurings: Recorded Investment $ 12,076   $ 12,186
Troubled Debt Restructurings That Have Defaulted on Modified Terms in the Last Twelve Months: Number of Contracts | contract  
Troubled Debt Restructurings That Have Defaulted on Modified Terms in the Last Twelve Months: Recorded Investment  
New During Period, Number of Contracts | item 0 0  
Performing [Member]      
Financing Receivable, Modifications [Line Items]      
Troubled Debt Restructurings: Recorded Investment [1] $ 9,803   11,555
Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Troubled Debt Restructurings: Recorded Investment [1] $ 2,273   $ 631
Residential Real Estate - Construction [Member]      
Financing Receivable, Modifications [Line Items]      
Troubled Debt Restructurings: Number of Contracts | contract 1   1
Troubled Debt Restructurings: Recorded Investment $ 466   $ 466
Troubled Debt Restructurings That Have Defaulted on Modified Terms in the Last Twelve Months: Number of Contracts | contract  
Troubled Debt Restructurings That Have Defaulted on Modified Terms in the Last Twelve Months: Recorded Investment  
Residential Real Estate - Construction [Member] | Performing [Member]      
Financing Receivable, Modifications [Line Items]      
Troubled Debt Restructurings: Recorded Investment [1]     $ 466
Residential Real Estate - Construction [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Troubled Debt Restructurings: Recorded Investment [1] $ 466    
Residential Real Estate [Member]      
Financing Receivable, Modifications [Line Items]      
Troubled Debt Restructurings: Number of Contracts | contract 5   5
Troubled Debt Restructurings: Recorded Investment $ 732   $ 737
Troubled Debt Restructurings That Have Defaulted on Modified Terms in the Last Twelve Months: Number of Contracts | contract  
Troubled Debt Restructurings That Have Defaulted on Modified Terms in the Last Twelve Months: Recorded Investment  
Residential Real Estate [Member] | Performing [Member]      
Financing Receivable, Modifications [Line Items]      
Troubled Debt Restructurings: Recorded Investment [1] 696   701
Residential Real Estate [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Troubled Debt Restructurings: Recorded Investment [1] $ 36   $ 36
Commercial Real Estate [Member]      
Financing Receivable, Modifications [Line Items]      
Troubled Debt Restructurings: Number of Contracts | contract 11   11
Troubled Debt Restructurings: Recorded Investment $ 10,878   $ 10,983
Troubled Debt Restructurings That Have Defaulted on Modified Terms in the Last Twelve Months: Number of Contracts | contract  
Troubled Debt Restructurings That Have Defaulted on Modified Terms in the Last Twelve Months: Recorded Investment  
Commercial Real Estate [Member] | Performing [Member]      
Financing Receivable, Modifications [Line Items]      
Troubled Debt Restructurings: Recorded Investment [1] 9,107   10,388
Commercial Real Estate [Member] | Nonperforming [Member]      
Financing Receivable, Modifications [Line Items]      
Troubled Debt Restructurings: Recorded Investment [1] $ 1,771   $ 595
[1] The performing status is determined by the loan's compliance with the modified terms.