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Employee Benefit Plans (Components of the Net Periodic Pension Plan Cost) (Pension) (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
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          
Defined benefit plan participation expense     $ 7,943   $ 7,943 $ 23,828 $ 23,828
Four Employees [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Employer discretionary contribution $ 112,708            
Defined benefit plan participation expense     14,089     42,266  
Pension [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Service cost     70,000   76,000 210,000 228,000
Interest cost     412,000   435,000 1,237,000 1,305,000
Expected return on assets     (751,000)   (708,000) (2,253,000) (2,089,000)
Amortization of transition asset     0   0 0 0
Amortization of net actuarial loss     264,000   212,000 792,000 636,000
Amortization of prior service cost     3,000   3,000 9,000 9,000
Net pension expense/(credit) included in employee benefits     $ (2,000)   $ 18,000 $ (5,000) $ 89,000
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").  
Employer discretionary contribution       $ 3,000,000