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Employee Benefit Plans (Narrative) (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2019
USD ($)
Jan. 31, 2018
USD ($)
Jan. 31, 2017
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
employee
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Defined Benefit Plan Disclosure [Line Items]                  
Discretionary contribution, percent of participant's base salary               15.00%  
Vesting period of employer discretionary contribution               2 years  
Defined benefit plan participation expense           $ 14,906 $ 14,906 $ 44,719 $ 44,719
Four Employees [Member]                  
Defined Benefit Plan Disclosure [Line Items]                  
Vesting period of employer discretionary contribution 2 years 2 years 2 years            
Employer discretionary contribution $ 123,179 $ 119,252 $ 112,780            
Defined benefit plan participation expense           $ 18,788   $ 56,364  
Pension [Member]                  
Defined Benefit Plan Disclosure [Line Items]                  
Period of employment used to determine benefits               5 years  
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 their (a) 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               $ 2,000,000  
Voluntary Separation Program (“VSP”) [Member] | Scenario, Plan [Member]                  
Defined Benefit Plan Disclosure [Line Items]                  
Number of associates signed separation agreements | employee         30        
Voluntary Separation Program (“VSP”) [Member] | Scenario, Forecast [Member]                  
Defined Benefit Plan Disclosure [Line Items]                  
Severance expense         $ 200,000        
Projected salaries and benefit savings       $ 1,400,000 $ (100,000)