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Employee Benefit Plans (Narrative) (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended
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Jan. 31, 2019 USD ($) | Jan. 31, 2018 USD ($) | Jan. 31, 2017 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) employee | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Discretionary contribution, percent of participant's base salary |  |  |  |  |  |  |  | 15.00% |
Vesting period of employer discretionary contribution |  |  |  |  |  |  |  | 2 years |
Defined benefit plan participation expense |  |  |  |  |  | $ 14,906 | $ 14,906 | $ 44,719 | $ 44,719
Four Employees [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Vesting period of employer discretionary contribution | 2 years | 2 years | 2 years |  |  |  |  |  |
Employer discretionary contribution | $ 123,179 | $ 119,252 | $ 112,780 |  |  |  |  |  |
Defined benefit plan participation expense |  |  |  |  |  | $ 18,788 |  | $ 56,364 |
Pension [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Period of employment used to determine benefits |  |  |  |  |  |  |  | 5 years |
Plan modification description |  |  |  |  |  |  |  | Effective April 30, 2010, the Pension Plan was amended, resulting in a "soft freeze", the effect of which prohibits new entrants into the plan and ceases crediting of additional years of service after that date. Effective January 1, 2013, the Pension Plan was amended to unfreeze it for those employees for whom the sum of their (a) ages, at their closest birthday plus (b) years of service for vesting purposes equals 80 or greater. The "soft freeze" continues to apply to all other plan participants. Pension benefits for these participants are managed through discretionary contributions to the First United Corporation 401(k) Profit Sharing Plan (the "401(k) Plan"). |
Employer discretionary contribution |  |  |  |  |  |  |  | $ 2,000,000 |
Voluntary Separation Program (“VSP”) [Member] | Scenario, Plan [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Number of associates signed separation agreements | employee |  |  |  |  | 30 |  |  |  |
Voluntary Separation Program (“VSP”) [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Severance expense |  |  |  |  | $ 200,000 |  |  |  |
Projected salaries and benefit savings |  |  |  | $ 1,400,000 | $ (100,000) |  |  |  |

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