Investment Securities (Narrative) (Details) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2020 USD ($) security	Sep. 30, 2020 USD ($) security financial_institution	Dec. 31, 2009 USD ($)	Dec. 31, 2019 USD ($) security
Schedule of Marketable Securities [Line Items]
Restricted stock	$ 2,600	$ 2,600		$ 4,300
Federal home loan bank, stock	2,400	$ 2,400		$ 4,100
Proceeds from sale of held-to-maturity securities	2,600
Net gain on marketable securities	$ 87
Percentage of original principal balance outstanding at the time of purchase (less than)	15.00%	15.00%
Number of corporate trust preferred securities issued | security	28	28		75
Other than temporary impairment			$ 865
Other-than-temporary impairment loss, debt securities, portion recognized in earnings			364
Other than temporary impairment loss, portion in other comprehensive loss			$ 501
Accretion recognized as increase in carrying amount of security		$ 14
Trust preferred debt securities – single issue
Schedule of Marketable Securities [Line Items]
Number of corporate trust preferred securities issued | security	2	2		2
Number of issuers of corporate trust preferred securities | financial_institution		1
Atlantic Community Bankers Bank Stock | Bankers Bank Stock
Schedule of Marketable Securities [Line Items]
Bankers bank stock	$ 160	$ 160		$ 160
Federal Home Loan Bank Borrowings [Member]
Schedule of Marketable Securities [Line Items]
Investment securities pledged to secure funds	$ 89,400	$ 89,400		$ 92,200