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Equity Compensation Plan Information (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Deferred compensation arrangement with individual, description       Stock-based awards were made to non-employee directors in May 2019 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       14,641  
Per share fair market value of issued fully vested common stock shares   $ 18.30   $ 18.30  
Shares issued to Director 1,000        
Cash paid to Director $ 10,000        
Stock compensation expense   $ 66,893 $ 66,717 $ 200,594 $ 182,606
Maximum [Member]          
Maximum issuance of common stock options   325,000   325,000