Loans And Credit Quality (Troubled Debt Restructuring Outstanding) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Modifications [Line Items]
Total Modifications	$ 2,518	$ 2,574
Accrual Loans [Member]
Financing Receivable, Modifications [Line Items]
Total Modifications	2,504	2,559
Non-Accrual Loans [Member]
Financing Receivable, Modifications [Line Items]
Total Modifications	14	15
Commercial real estate [Member]
Financing Receivable, Modifications [Line Items]
Total Modifications	1,100	1,125
Commercial real estate [Member] | Accrual Loans [Member]
Financing Receivable, Modifications [Line Items]
Total Modifications	1,100	1,125
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Total Modifications	227	230
Commercial [Member] | Accrual Loans [Member]
Financing Receivable, Modifications [Line Items]
Total Modifications	227	230
Commercial [Member] | Construction [Member]
Financing Receivable, Modifications [Line Items]
Total Modifications	259	260
Commercial [Member] | Construction [Member] | Accrual Loans [Member]
Financing Receivable, Modifications [Line Items]
Total Modifications	259	260
Residential real estate [Member]
Financing Receivable, Modifications [Line Items]
Total Modifications	932	959
Residential real estate [Member] | Accrual Loans [Member]
Financing Receivable, Modifications [Line Items]
Total Modifications	918	944
Residential real estate [Member] | Non-Accrual Loans [Member]
Financing Receivable, Modifications [Line Items]
Total Modifications	$ 14	$ 15