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Loans (Recorded Investment By Loan Class In Current And Nonaccrual Loans) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans $ 5,893 $ 4,878  
Nonaccrual 6,317 8,432  
Current 2,292,861 2,039,290  
Total loans 2,305,071 2,052,600 $ 1,881,071
30 to 59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 5,128 3,384  
60 to 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 756 1,486  
Greater than 90 Days [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 9 8  
Commercial Business [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 1,337 933  
Nonaccrual 2,151 3,922  
Current 345,591 308,620  
Total loans 349,079 313,475 267,377
Commercial Business [Member] | 30 to 59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 1,337 321  
Commercial Business [Member] | 60 to 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans   612  
Commercial Mortgage [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 48 214  
Nonaccrual 1,025 947  
Current 670,479 566,320  
Total loans 671,552 567,481 476,407
Commercial Mortgage [Member] | 30 to 59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 48 68  
Commercial Mortgage [Member] | 60 to 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans   146  
Residential Real Estate Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 1,326 1,118  
Nonaccrual 1,236 1,848  
Current 418,914 373,057  
Total loans 421,476 376,023 352,782
Residential Real Estate Loans [Member] | 30 to 59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 1,073 723  
Residential Real Estate Loans [Member] | 60 to 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 253 395  
Residential Real Estate Lines [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 216 233  
Nonaccrual 372 235  
Current 119,157 124,298  
Total loans 119,745 124,766 127,233
Residential Real Estate Lines [Member] | 30 to 59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 216 199  
Residential Real Estate Lines [Member] | 60 to 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans   34  
Consumer Indirect [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 2,808 2,261  
Nonaccrual 1,526 1,467  
Current 721,420 648,766  
Total loans 725,754 652,494 636,357
Consumer Indirect [Member] | 30 to 59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 2,320 1,975  
Consumer Indirect [Member] | 60 to 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 488 286  
Other Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 158 119  
Nonaccrual 7 13  
Current 17,300 18,229  
Total loans 17,465 18,361 $ 20,915
Other Consumer [Member] | 30 to 59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 134 98  
Other Consumer [Member] | 60 to 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 15 13  
Other Consumer [Member] | Greater than 90 Days [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans $ 9 $ 8