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Loan Quality (Impaired Financing Receivables) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]      
Recorded Investment With No Allowance $ 15,067 $ 16,828  
Unpaid Principal Balance With No Allowance 15,826 17,741  
Recorded Investment With Allowance   9  
Unpaid Principal Balance With Allowance   10  
Related Allowance   9  
Average Recorded Investment 19,617 16,928 $ 29,132
Interest Income Recognized 632 135 122
Residential Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment With No Allowance 1,041 1,628  
Unpaid Principal Balance With No Allowance 1,123 1,858  
Average Recorded Investment 1,287 1,636 2,755
Interest Income Recognized 39 13 4
Residential Real Estate [Member] | First Liens [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment With No Allowance 956 1,523  
Unpaid Principal Balance With No Allowance 1,030 1,725  
Average Recorded Investment 1,194 1,531 2,619
Interest Income Recognized 38 13 4
Residential Real Estate [Member] | Junior Liens & Lines Of Credit [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment With No Allowance 85 105  
Unpaid Principal Balance With No Allowance 93 133  
Average Recorded Investment 93 105 136
Interest Income Recognized 1    
Residential Real Estate - Construction [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment With No Allowance 480 502  
Unpaid Principal Balance With No Allowance 535 546  
Average Recorded Investment 492 505 686
Interest Income Recognized 4    
Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment With No Allowance 13,523 14,431  
Unpaid Principal Balance With No Allowance 14,133 15,007  
Average Recorded Investment 17,806 14,509 23,801
Interest Income Recognized 589 122 118
Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment With No Allowance 23 267  
Unpaid Principal Balance With No Allowance 35 330  
Recorded Investment With Allowance   9  
Unpaid Principal Balance With Allowance   10  
Related Allowance   9  
Average Recorded Investment 32 278 $ 1,890
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment With No Allowance  
Unpaid Principal Balance With No Allowance  
Recorded Investment With Allowance  
Unpaid Principal Balance With Allowance  
Related Allowance