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Loan Quality and Allowance for Loan Losses (Impaired Financing Receivables) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]      
Recorded Investment With No Allowance $ 12,401   $ 12,583
Unpaid Principal Balance With No Allowance 13,046   13,223
Recorded Investment With Allowance  
Unpaid Principal Balance With Allowance  
Related Allowance  
Average Recorded Investment 12,450 $ 15,025  
Interest Income Recognized 116 126  
Residential Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment With No Allowance 803   869
Unpaid Principal Balance With No Allowance 882   950
Recorded Investment With Allowance  
Unpaid Principal Balance With Allowance  
Related Allowance  
Average Recorded Investment 805 1,004  
Interest Income Recognized 11 10  
Residential Real Estate [Member] | First Liens [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment With No Allowance 803   869
Unpaid Principal Balance With No Allowance 882   950
Recorded Investment With Allowance  
Unpaid Principal Balance With Allowance  
Related Allowance  
Average Recorded Investment 805 919  
Interest Income Recognized 11 10  
Residential Real Estate [Member] | Junior Liens & Lines Of Credit [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment With Allowance  
Unpaid Principal Balance With Allowance  
Related Allowance  
Average Recorded Investment   85  
Residential Real Estate - Construction [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment With No Allowance 466   466
Unpaid Principal Balance With No Allowance 531   531
Recorded Investment With Allowance  
Unpaid Principal Balance With Allowance  
Related Allowance  
Average Recorded Investment 466 479  
Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment With No Allowance 10,949   11,061
Unpaid Principal Balance With No Allowance 11,435   11,541
Recorded Investment With Allowance  
Unpaid Principal Balance With Allowance  
Related Allowance  
Average Recorded Investment 10,994 13,519  
Interest Income Recognized 105 116  
Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment With No Allowance 183   187
Unpaid Principal Balance With No Allowance 198   201
Recorded Investment With Allowance  
Unpaid Principal Balance With Allowance  
Related Allowance  
Average Recorded Investment $ 185 $ 23