Loans And Credit Quality (Activity In Allowance For Loan Losses) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 11,034,000	$ 8,366,000	$ 10,570,000	$ 8,022,000
Charge-offs	0	0	(2,000)	0
Recoveries	1,000	1,000	2,000	25,000
Provision for loan losses	125,000	650,000	590,000	970,000
Ending balance	11,160,000	9,017,000	11,160,000	9,017,000
Commercial real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	4,687,000	3,353,000	4,379,000	3,221,000
Recoveries				24,000
Provision for loan losses	(145,000)	221,000	163,000	329,000
Ending balance	4,542,000	3,574,000	4,542,000	3,574,000
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	916,000	817,000	848,000	770,000
Provision for loan losses	429,000	(55,000)	497,000	(8,000)
Ending balance	1,345,000	762,000	1,345,000	762,000
Commercial [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	113,000	121,000	150,000	121,000
Provision for loan losses	3,000	(8,000)	(34,000)	(8,000)
Ending balance	116,000	113,000	116,000	113,000
Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	4,497,000	3,627,000	4,485,000	3,488,000
Recoveries	1,000	1,000	2,000	1,000
Provision for loan losses	89,000	(10,000)	100,000	129,000
Ending balance	4,587,000	3,618,000	4,587,000	3,618,000
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	12,000	18,000	14,000	19,000
Charge-offs			(2,000)
Provision for loan losses	13,000	(2,000)	13,000	(3,000)
Ending balance	25,000	16,000	25,000	16,000
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	809,000	430,000	694,000	403,000
Provision for loan losses	(264,000)	504,000	(149,000)	531,000
Ending balance	$ 545,000	$ 934,000	$ 545,000	$ 934,000