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Employee Benefit Plans (Narrative) (Details)
 1 Months Ended 12 Months Ended
Jan. 31, 2020
USD ($)
employee
Jan. 31, 2019
USD ($)
employee
Jan. 31, 2018
USD ($)
employee
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Defined Benefit Plan Disclosure [Line Items]          
Discretionary contribution as percentage of employee's base pay       15.00%  
Defined Contribution Plan, Cost Recognized       $ 1,200,000 $ 1,200,000
Pension [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Plan modification description         Effective April 30, 2010, the Pension Plan was amended, resulting in a "soft freeze", the effect of which prohibits new entrants into the plan and ceases crediting of additional years of service, after that date. Effective January 1, 2013, the Pension Plan was amended to unfreeze it for those employees for whom the sum of (i) their ages, at their closest birthday, plus (ii) years of service for vesting purposes equals 80 or greater. The "soft freeze" continues to apply to all other plan participants. Pension benefits for these participants will be managed through discretionary contributions to the First United Corporation 401(k) Profit Sharing Plan (the "401(k) Plan").
Defined Benefit Plan, Accumulated Benefit Obligation       $ 48,900,000 $ 39,800,000
Period for average return on pension portfolio assets       25 years  
Average return on pension portfolio assets       7.15%  
Expected long-term return on pension portfolio assets       7.00%  
Defined Benefit Plan, Contributions by Employer       $ 2,000,000
SERP [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Employer discretionary contribution   $ 123,179 $ 119,252    
Defined contribution plan, number of employees | employee   4 4    
Vesting period of employer discretionary contribution       2 years  
Defined Contribution Plan, Cost Recognized       $ 75,152 59,626
Defined Benefit Plan, Accumulated Benefit Obligation       7,700,000 7,500,000
Defined Benefit Plan, Contributions by Employer       $ 283,000 $ 226,000
SERP [Member] | Subsequent Event [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Employer discretionary contribution $ 126,058        
Defined contribution plan, number of employees | employee 4        
Vesting period of employer discretionary contribution 2 years