Nature of Banking Activities and Significant Accounting Policies (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) property	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Organization And Significant Accounting Policies [Line Items]
Number Of Full Service Offices			24
Number of Loan Production Offices			2
Other real estate owned | $	$ 4,416		$ 4,416		$ 4,527
Dividends paid | $	1,116	$ 670	3,353	$ 2,002
Income Tax Expense Benefit | $	$ 1,143	$ 1,087	$ 2,450	$ 2,674
Virginia
Organization And Significant Accounting Policies [Line Items]
Number Of Full Service Offices			18
Maryland
Organization And Significant Accounting Policies [Line Items]
Number Of Full Service Offices			6