Summary of Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) branch operation_center loan_production_office loan	Dec. 31, 2021 USD ($)	Jan. 01, 2022 USD ($)
Property, Plant and Equipment [Line Items]
Number of operation centers | operation_center	2
Number of LPOs | loan_production_office	4
Trading securities	$ 0	$ 0
Number of mortgage loans sold | loan	9
PCD loans unpaid principal balance	$ 1,400,000
PCD loans purchased, carrying amount	1,100,000
PCD loans discount	8,000
Occupancy expense, depreciation of premises and equipment and other	$ 1,600,000	1,500,000
Estimates for economic forecast, period (in years)	1 year
Reversion to historical mean loss rates, period (in years)	1 year
Interest rate lock commitments
Property, Plant and Equipment [Line Items]
Derivative asset	$ 0	28,000
Net gain on mortgage related banking derivatives	0	28,000
Other Assets | Interest rate lock commitments
Property, Plant and Equipment [Line Items]
Derivative notional value	$ 0	$ 1,200,000
Maryland and Virginia
Property, Plant and Equipment [Line Items]
Number of branches | branch	12
Leonardtown, La Plata
Property, Plant and Equipment [Line Items]
Number of branches | branch	2
Minimum | Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment
Property, Plant and Equipment [Line Items]
Allowance for credit loss			$ (2,500,000)
Building and Building Improvements | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	50 years
Building and Building Improvements | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	10 years
Furniture and Fixtures | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	15 years
Furniture and Fixtures | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Automobiles | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years
Automobiles | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	4 years