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Equity Compensation Plan Information (Narrative) (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Deferred compensation arrangement with individual, description       Stock-based awards were made to non-employee directors in May 2018 pursuant to First United Corporation's director compensation policy. Each director receives an annual retainer of 1,000 shares of First United Corporation common stock, plus $10,000 to be paid, at the director's election, in cash or additional shares of common stock.  
Director [Member]          
Issued fully-vested common stock shares       12,936  
Per share fair market value of issued fully vested common stock shares       $ 20.63  
Shares issued to Director 1,000        
Cash paid to Director $ 10,000        
Director stock compensation expense   $ 62,331 $ 48,099 $ 115,889 $ 85,282,000
Maximum [Member]          
Maximum issuance of common stock options   325,000   325,000