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Employee Benefit Plans (Components of the Net Periodic Pension Plan Cost) (Pension) (Details) - USD ($)
 1 Months Ended 3 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
Mar. 31, 2018
Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]          
Discretionary contribution, percent of participant's base salary       15.00%  
Two Employees [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Employer discretionary contribution     $ 63,500    
Four Employees [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Employer discretionary contribution $ 119,252 $ 112,780      
Pension [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Service cost       $ 81,000 $ 70,000
Interest cost       397,000 413,000
Expected return on assets       (810,000) (751,000)
Amortization of transition asset       0 0
Amortization of net actuarial loss       300,000 264,000
Amortization of prior service cost       2,000 3,000
Net pension expense/(credit) included in employee benefits       $ (30,000) (1,000)
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 (a) their ages, at their closest birthday, plus (b) 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 are managed through discretionary contributions to the First United Corporation 401(k) Profit Sharing Plan (the "401(k) Plan").  
SERP [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Service cost       $ 28,000 26,000
Interest cost       75,000 72,000
Amortization of prior service cost       (1,000) (1,000)
Net pension expense/(credit) included in employee benefits       143,000 134,000
Defined benefit plan participation expense       14,906  
SERP 2017 [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan participation expense       $ 14,089 $ 14,089