Regulatory Capital Requirements (Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations) (Details)	Sep. 30, 2021	Dec. 31, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital to Risk Weighted Assets	15.51	16.08
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00
Capital Required to be Well Capitalized to Risk Weighted Assets	10.00
Tier 1 Risk Based Capital to Risk Weighted Assets	14.26	14.83
Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	6.00
Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	8.00
Common equity, Ratio	12.15	12.61
Common equity, Required For Capital Adequacy Purposes, Ratio	4.50
Common equity, Required To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.50
Tier 1 Leverage Capital to Average Assets	10.33	10.36
Tier 1 Leverage Capital Required for Capital Adequacy to Average Assets	4.00
Tier 1 Leverage Capital Required to be Well Capitalized to Average Assets	5.00
First United Bank & Trust [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital to Risk Weighted Assets	14.64	15.50
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00
Capital Required to be Well Capitalized to Risk Weighted Assets	10.00
Tier 1 Risk Based Capital to Risk Weighted Assets	13.39	14.25
Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	6.00
Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	8.00
Common equity, Ratio	13.39	14.25
Common equity, Required For Capital Adequacy Purposes, Ratio	4.50
Common equity, Required To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.50
Tier 1 Leverage Capital to Average Assets	9.59	9.81
Tier 1 Leverage Capital Required for Capital Adequacy to Average Assets	4.00
Tier 1 Leverage Capital Required to be Well Capitalized to Average Assets	5.00