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Employee Benefit Plans (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016 | Sep. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Discretionary contribution, percent of participant's base salary |  |  |  |  |  |  |  |  | 15.00%
Two Employees [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Employer discretionary contribution |  |  | $ 63,500 |  |  |  |  |  |
Four Employees [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Employer discretionary contribution | $ 119,252 | $ 112,780 |  |  |  |  |  |  |
Pension [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
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 (a) their 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").
SERP [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Defined benefit plan participation expense |  |  |  | $ 14,906 |  |  |  |  | $ 44,719
SERP Alternative [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Defined benefit plan participation expense |  |  |  |  | $ 14,089 | $ 14,089 | $ 42,266 | $ 42,266 |

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- Definition Description of significant modifications (such as a change in expiration dating, vesting rights, or exercise prices) to an equity-based compensation plan, including the terms of the modifications. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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