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Employee Benefit Plans (Narrative) (Details) - USD ($)
 1 Months Ended 12 Months Ended 24 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]            
Discretionary contribution as percentage of employee's base pay       15.00%    
Employer discretionary contribution   $ 119,252 $ 112,708      
Vesting period of employer discretionary contribution   2 years 2 years      
Defined Contribution Plan, Cost Recognized       $ 1,200,000 $ 1,100,000  
Subsequent Event [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Employer discretionary contribution $ 123,179          
Pension [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Defined Benefit Plan, Accumulated Benefit Obligation       $ 39,800,000 41,800,000 $ 39,800,000
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").    
Average return on pension portfolio assets       7.03%   7.03%
Expected long-term return on pension portfolio assets       7.00%   7.00%
Defined Benefit Plan, Contributions by Employer       $ 0 3,000,000  
SERP [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Defined Contribution Plan, Cost Recognized       59,626   $ 56,354
Defined Benefit Plan, Accumulated Benefit Obligation       7,500,000 7,600,000 $ 7,500,000
Defined Benefit Plan, Contributions by Employer       $ 226,000 $ 207,000