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Equity Compensation Plan Information (Narrative) (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 26, 2020 | May 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
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. |  |
Maximum [Member] |  |  |  |  |
Maximum issuance of common stock options |  |  | 325,000 |  |
Director [Member] |  |  |  |  |
Shares issued to Director |  | 1,000 |  |  |
Cash paid to Director |  | $ 10,000 |  |  |
Fully vested shares of common stock issued, per share value |  |  |  |  | $ 18.30
Issued fully-vested common stock shares |  |  |  |  | 14,641
Stock compensation expense |  |  | $ 66,983 | $ 66,717 |
Restricted Stock Units (RSUs) [Member] | Long-Term Incentive Plan [Member] |  |  |  |  |
Share based compensation performance period | 3 years |  |  |  |
Shares of common stock granted |  |  | 25,004 |  |
Shares of common stock grant date fair market value |  |  | $ 12.54 |  |
Stock compensation expense |  |  | $ 31,242 |  |
Restricted Stock Units (RSUs) [Member] | Long-Term Incentive Plan [Member] | Officers [Member] | Share-based Compensation Award, Tranche One [Member] |  |  |  |  |
Share based compensation performance based award, percent | 50.00% |  |  |  |
Restricted Stock Units (RSUs) [Member] | Long-Term Incentive Plan [Member] | Officers [Member] | Share-based Compensation Award, Tranche Two [Member] |  |  |  |  |
Share based compensation performance based award, percent | 100.00% |  |  |  |
Restricted Stock Units (RSUs) [Member] | Long-Term Incentive Plan [Member] | Officers [Member] | Share-based Compensation Award, Tranche Three [Member] |  |  |  |  |
Share based compensation performance based award, percent | 150.00% |  |  |  |
Unvested Restricted Stock Units [Member] | Long-Term Incentive Plan [Member] |  |  |  |  |
Stock compensation expense |  |  | $ 282,282 |  |

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