v3.25.4
Employee Benefit Plans (Narrative) (Details)
 1 Months Ended 12 Months Ended
Jan. 31, 2025
USD ($)
employee
Jan. 31, 2024
USD ($)
employee
Jan. 31, 2023
USD ($)
employee
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Employee Benefit Plans          
Discretionary contribution as percentage of employee's base pay       15.00%  
Defined benefit plan participants compensation expense       $ 1,600,000 $ 1,400,000
Pension          
Employee Benefit Plans          
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 Pension 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       $ 36,400,000 35,300,000
Period for average return on pension portfolio assets       25 years  
Average return on pension portfolio assets       6.63%  
Expected long-term return on pension portfolio assets       6.50%  
Defined benefit plan, contribution by employer       $ 0 0
SERP          
Employee Benefit Plans          
Vesting period of employer discretionary contribution       2 years  
Defined benefit plan, accumulated benefit obligation       $ 8,600,000 8,200,000
Defined benefit plan, contribution by employer       336,000 336,000
SERP | Three Participants          
Employee Benefit Plans          
Defined contribution plan, number of employees | employee 3 3 3    
Employer discretionary contribution $ 119,735 $ 114,958 $ 108,184    
Defined benefit plan participants compensation expense         54,092
SERP | 2nd Three Participants          
Employee Benefit Plans          
Defined benefit plan participants compensation expense       57,479 $ 57,479
SERP | 3rd Three Participants          
Employee Benefit Plans          
Defined benefit plan participants compensation expense       $ 59,872