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Loans And Related Allowances For Loan Losses (Narrative) (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021 USD ($) contract	Jun. 30, 2020 USD ($) contract	Jun. 30, 2021 USD ($) contract loan	Jun. 30, 2020 USD ($) contract	Dec. 31, 2020 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Financing Receivable, Modifications [Line Items]
Allowance for loan losses	$ 17,068,000	$ 17,014,000	$ 17,068,000	$ 17,014,000	$ 16,486,000	$ 16,554,000	$ 15,012,000	$ 12,537,000
Nonaccrual loans	7,285,000		7,285,000		3,339,000
Financing receivable, modifications, subsequent default, recorded investment			0	$ 0
Partial Charge Off [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	$ 500,000		$ 500,000		200,000
New TDRs [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Existing TDRs [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	1	6	1	6
Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | loan			14
Financing receivable, modifications, recorded investment	$ 3,800,000		$ 3,800,000		4,000,000.0
Additional funds	0		0
Financing receivable, modifications, subsequent default, recorded investment		$ 0
Commercial real estate- non owner-occupied [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	4,575,000		4,575,000		8,000
Commercial real estate- all other CRE [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	557,000		557,000		890,000
Acquisition and development- 1-4 family residential construction [Member]
Financing Receivable, Modifications [Line Items]
Loans in process of foreclosure	600,000		$ 600,000		$ 400,000
Percentage of loan portfolio accruing loans including PPP loans past due 30 days or more			0.19%		0.17%
Percentage of loan portfolio accruing loans excluding PPP loans past due 30 days or more			0.20%		0.20%
Acquisition and development- All other A&D [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	401,000		$ 401,000		$ 366,000
Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
PPP loans					114,000,000.0
Allowance for loan losses	2,944,000	1,997,000	2,944,000	$ 1,997,000	2,584,000	2,831,000	1,682,000	1,341,000
Commercial and industrial [Member] | CARES Act [Member]
Financing Receivable, Modifications [Line Items]
PPP loans	74,100,000		$ 74,100,000		$ 114,000,000.0
PPP loans SBA guarantee percent			100.00%		100.00%
Allowance for loan losses	0		$ 0		$ 0
Residential mortgage- term [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	1,281,000		1,281,000		1,634,000
Residential mortgage- home equity [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	471,000		471,000		414,000
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Allowance for loan losses	$ 590,000	$ 386,000	$ 590,000	$ 386,000	370,000	$ 368,000	$ 365,000	$ 312,000
Nonaccrual loans					$ 27,000

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