Loans And The Allowance For Loan Losses (Loans Classified As Troubled Debt Restructurings) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Modifications [Line Items]
Total	$ 7,250	$ 5,090
Related Allowance	268	174
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Total	734	574
Related Allowance	8	147
Consumer And Other Loans [Member]
Financing Receivable, Modifications [Line Items]
Total	25	26
Related Allowance	24	26
Nonaccruing [Member]
Financing Receivable, Modifications [Line Items]
Total	4,386	1,247
Nonaccruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Total	220	532
Nonaccruing [Member] | Consumer And Other Loans [Member]
Financing Receivable, Modifications [Line Items]
Total
Accruing [Member]
Financing Receivable, Modifications [Line Items]
Total	2,864	3,843
Accruing [Member] | Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Total	514	42
Accruing [Member] | Consumer And Other Loans [Member]
Financing Receivable, Modifications [Line Items]
Total	25	26
Total Real Estate Loans [Member] | Home Equities [Member]
Financing Receivable, Modifications [Line Items]
Total	794	667
Related Allowance		1
Total Real Estate Loans [Member] | Nonaccruing [Member] | Home Equities [Member]
Financing Receivable, Modifications [Line Items]
Total	128	175
Total Real Estate Loans [Member] | Accruing [Member] | Home Equities [Member]
Financing Receivable, Modifications [Line Items]
Total	666	492
Mortgages [Member] | Total Real Estate Loans [Member] | Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Total	1,656	1,949
Related Allowance
Mortgages [Member] | Total Real Estate Loans [Member] | Commercial Real Estate Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Total	3,854	1,617
Related Allowance	236
Mortgages [Member] | Total Real Estate Loans [Member] | Nonaccruing [Member] | Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Total	271	227
Mortgages [Member] | Total Real Estate Loans [Member] | Nonaccruing [Member] | Commercial Real Estate Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Total	3,767	313
Mortgages [Member] | Total Real Estate Loans [Member] | Accruing [Member] | Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Total	1,385	1,722
Mortgages [Member] | Total Real Estate Loans [Member] | Accruing [Member] | Commercial Real Estate Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Total	87	1,304
Construction [Member] | Total Real Estate Loans [Member] | Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Total
Related Allowance
Construction [Member] | Total Real Estate Loans [Member] | Commercial Real Estate Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Total	187	257
Related Allowance
Construction [Member] | Total Real Estate Loans [Member] | Nonaccruing [Member] | Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Total
Construction [Member] | Total Real Estate Loans [Member] | Nonaccruing [Member] | Commercial Real Estate Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Total
Construction [Member] | Total Real Estate Loans [Member] | Accruing [Member] | Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Total
Construction [Member] | Total Real Estate Loans [Member] | Accruing [Member] | Commercial Real Estate Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Total	$ 187	$ 257