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Loans (Recorded Investment By Loan Class In Current And Nonaccrual Loans) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans $ 6,522 $ 5,893  
Nonaccrual 12,520 6,317  
Current 2,675,880 2,292,861  
Total loans 2,694,922 2,305,071 $ 2,052,600
30 to 59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 5,357 5,128  
60 to 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 1,154 756  
Greater than 90 Days [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 11 9  
Commercial Business [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 100 1,337  
Nonaccrual 5,344 2,151  
Current 444,319 345,591  
Total loans 449,763 349,079 313,475
Commercial Business [Member] | 30 to 59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 64 1,337  
Commercial Business [Member] | 60 to 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 36    
Commercial Mortgage [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 431 48  
Nonaccrual 2,623 1,025  
Current 807,797 670,479  
Total loans 810,851 671,552 567,481
Commercial Mortgage [Member] | 30 to 59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 56 48  
Commercial Mortgage [Member] | 60 to 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 375    
Residential Real Estate Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 1,964 1,326  
Nonaccrual 2,252 1,236  
Current 453,545 418,914  
Total loans 457,761 421,476 376,023
Residential Real Estate Loans [Member] | 30 to 59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 1,908 1,073  
Residential Real Estate Loans [Member] | 60 to 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 56 253  
Residential Real Estate Lines [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 349 216  
Nonaccrual 404 372  
Current 112,669 119,157  
Total loans 113,422 119,745 124,766
Residential Real Estate Lines [Member] | 30 to 59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 349 216  
Consumer Indirect [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 3,478 2,808  
Nonaccrual 1,895 1,526  
Current 840,309 721,420  
Total loans 845,682 725,754 652,494
Consumer Indirect [Member] | 30 to 59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 2,806 2,320  
Consumer Indirect [Member] | 60 to 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 672 488  
Other Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 200 158  
Nonaccrual 2 7  
Current 17,241 17,300  
Total loans 17,443 17,465 $ 18,361
Other Consumer [Member] | 30 to 59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 174 134  
Other Consumer [Member] | 60 to 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans 15 15  
Other Consumer [Member] | Greater than 90 Days [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Past Due Loans $ 11 $ 9