Equity Compensation Plan Information (Narrative) (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Feb. 28, 2015
Jan. 31, 2015
May 31, 2014
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Share-based compensation arrangement by share-based payment award, description           On June 18, 2008, the Board of Directors of First United Corporation adopted a Long-Term Incentive Program (the "LTIP"). This program was adopted as a sub-plan of the Omnibus Plan to reward participants for increasing shareholder value, align executive interests with those of shareholders, and serve as a retention tool for key executives. Under the LTIP, participants are granted shares of restricted common stock of First United Corporation. The amount of an award is based on a specified percentage of the participant's salary as of the date of grant. These shares will vest if the Corporation meets or exceeds certain performance thresholds.  
Deferred compensation arrangement with individual, description           Stock-based awards were made to non-employee directors in May 2016 pursuant to First United Corporation's director compensation policy. Beginning May 2014, each director receives an annual retainer of 1,000 shares of First United Corporation common stock, plus $10,000, all or some of which may be paid, at the director's election, in cash or additional shares of common stock.  
Shares granted, other than options 5,387            
Shares granted, fair market value $ 8.76 $ 8.63          
Director [Member]              
Issued fully-vested common stock shares           14,384  
Shares issued to Director     1,000        
Cash paid to Director     $ 10,000        
Director stock compensation expense       $ 37,183 $ 35,889 $ 109,823 $ 111,848
Shares granted, fair market value           $ 10.34  
Executive [Member]              
Stock compensation expense       $ 11,382 $ 11,382 $ 34,145 $ 32,094
Maximum [Member]              
Maximum issuance of common stock options       185,000   185,000  
Restricted Stock [Member] | Executive Officer[Member]              
LTEP vesting period           2 years  
Shares granted, other than options   4,845