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Equity Compensation Plan Information (Narrative) (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Mar. 26, 2020 | Jun. 30, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Deferred Compensation Arrangement with Individual, Description |  |  |  |  |  | Stock based awards were made to non employee directors in June 2020 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 |  |  | 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 |  | $ 14.52 |  |  |  |  |
Issued fully-vested common stock shares |  | 13,160 |  |  |  |  |
Stock compensation expense |  |  | $ 52,114 |  | $ 66,893 | $ 158,795 | $ 200,594
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 |  |  | $ 31,243 |  |  | 93,727 |
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 |  |  |  |  |  | $ 219,797 |

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