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Loans And Related Allowances For Loan Losses (Narrative) (Details)		3 Months Ended		12 Months Ended
	Apr. 24, 2021 USD ($) loan	Mar. 31, 2021 USD ($) contract loan	Mar. 31, 2020 USD ($) contract	Dec. 31, 2020 USD ($) contract	Dec. 31, 2019 USD ($)
Financing Receivable, Modifications [Line Items]
Allowance for loan losses		$ 16,554,000	$ 15,012,000	$ 16,486,000	$ 12,537,000
Nonaccrual loans		7,891,000		3,339,000
COVID-19 Modifications [Member] | Subsequent Event [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | loan	12
Financing receivable, modifications, recorded investment	$ 5,700,000
Partial Charge Off [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans		$ 400,000		$ 200,000
New TDRs [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract		0	0
Existing TDRs [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract		0	0
Financing receivable, modifications, subsequent default, recorded investment		$ 0	$ 0
Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract		14		14
Financing receivable, modifications, recorded investment		$ 3,900,000		$ 4,000,000.0
Hospitality Loans [Member] | Substandard [Member]
Financing Receivable, Modifications [Line Items]
Increase in non-accrual status		$ 4,000,000.0
Number of non-accrual loans | loan		2
Commercial real estate- non owner-occupied [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans		$ 4,582,000		8,000
Commercial real estate- all other CRE [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans		866,000		890,000
Acquisition and development- 1-4 family residential construction [Member]
Financing Receivable, Modifications [Line Items]
Loans in process of foreclosure		$ 400,000		400,000
Percentage of loan portfolio accruing loans including PPP loans past due 30 days or more		0.15%
Percentage of loan portfolio accruing loans excluding PPP loans past due 30 days or more		0.17%	0.67%
Acquisition and development- All other A&D [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans		$ 408,000		366,000
Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
PPP loans				114,000,000.0
Allowance for loan losses		2,831,000	$ 1,682,000	2,584,000	1,341,000
Commercial and industrial [Member] | CARES Act [Member]
Financing Receivable, Modifications [Line Items]
PPP loans		$ 145,200,000		$ 114,000,000.0
PPP loans SBA guarantee percent		100.00%		100.00%
Allowance for loan losses		$ 0		$ 0
Residential mortgage- term [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans		1,534,000		1,634,000
Residential mortgage- home equity [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans		478,000		414,000
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Allowance for loan losses		368,000	$ 365,000	370,000	$ 312,000
Nonaccrual loans		$ 23,000		$ 27,000

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