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Loan Quality and Allowance for Loan Losses (Impaired Financing Receivables) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]          
Recorded Investment With No Allowance $ 15,077   $ 15,077   $ 12,583
Unpaid Principal Balance With No Allowance 23,368   23,368   13,223
Recorded Investment With Allowance 181   181  
Unpaid Principal Balance With Allowance 181   181  
Related Allowance 181   181  
Average Recorded Investment 16,074 $ 13,192 17,710 $ 14,191  
Interest Income Recognized 119 119 349 360  
Residential Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded Investment With No Allowance 820   820   869
Unpaid Principal Balance With No Allowance 936   936   950
Recorded Investment With Allowance    
Unpaid Principal Balance With Allowance    
Related Allowance    
Average Recorded Investment 1,359 1,211 1,649 1,237  
Interest Income Recognized 12 10 33 32  
Residential Real Estate [Member] | First Liens [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded Investment With No Allowance 754   754   869
Unpaid Principal Balance With No Allowance 870   870   950
Recorded Investment With Allowance    
Unpaid Principal Balance With Allowance    
Related Allowance    
Average Recorded Investment 1,091 1,157 899 1,152  
Interest Income Recognized 10 10 31 32  
Residential Real Estate [Member] | Junior Liens & Lines Of Credit [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded Investment With No Allowance 66   66    
Unpaid Principal Balance With No Allowance 66   66    
Recorded Investment With Allowance    
Unpaid Principal Balance With Allowance    
Related Allowance    
Average Recorded Investment 268 54 750 85  
Interest Income Recognized 2   2    
Residential Real Estate - Construction [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded Investment With No Allowance 460   460   466
Unpaid Principal Balance With No Allowance 531   531   531
Recorded Investment With Allowance    
Unpaid Principal Balance With Allowance    
Related Allowance    
Average Recorded Investment 461 471 463 475  
Commercial Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded Investment With No Allowance 10,715   10,715   11,061
Unpaid Principal Balance With No Allowance 11,248   11,248   11,541
Recorded Investment With Allowance    
Unpaid Principal Balance With Allowance    
Related Allowance    
Average Recorded Investment 10,789 11,218 10,314 12,216  
Interest Income Recognized 107 109 316 328  
Commercial [Member]          
Financing Receivable, Impaired [Line Items]          
Recorded Investment With No Allowance 3,082   3,082   187
Unpaid Principal Balance With No Allowance 10,653   10,653   201
Recorded Investment With Allowance 181   181  
Unpaid Principal Balance With Allowance 181   181  
Related Allowance 181   181  
Average Recorded Investment $ 3,465 $ 292 $ 5,284 $ 263