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Employee Benefit Plans (Narrative) (Details) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2019 USD ($) | Jan. 31, 2021 USD ($) employee | Jan. 31, 2020 USD ($) employee | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jan. 31, 2018 employee
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Discretionary contribution as percentage of employee's base pay |  |  |  | 15.00% |  |
Defined benefit plan participants compensation expense |  |  |  | $ 1,100,000 | $ 1,200,000 |
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 Pension 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 (i) their ages, at their closest birthday, plus (ii) 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 will be managed through discretionary contributions to the First United Corporation 401(k) Profit Sharing Plan (the “401(k) Plan”). |  |
Defined Benefit Plan, Accumulated Benefit Obligation |  |  |  | $ 54,000,000.0 | 48,900,000 |
Period for average return on pension portfolio assets |  |  |  | 25 years |  |
Average return on pension portfolio assets |  |  |  | 7.05% |  |
Expected long-term return on pension portfolio assets |  |  |  | 7.00% |  |
Defined benefit plan, contribution by employer |  |  |  | $ 1,000,000 | 2,000,000 |
SERP [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Employer discretionary contribution | $ 123,179 |  |  |  |  |
Defined contribution plan, number of employees | employee |  |  |  |  |  | 4
Vesting period of employer discretionary contribution |  |  |  | 2 years |  |
Defined benefit plan participants compensation expense |  |  |  | $ 48,027 | 75,175 |
Defined Benefit Plan, Accumulated Benefit Obligation |  |  |  | 8,700,000 | 7,700,000 |
Defined benefit plan, contribution by employer |  |  |  | 266,000 | $ 283,000 |
SERP [Member] | Subsequent Event [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Employer discretionary contribution |  | $ 101,257 |  |  |  |
Defined contribution plan, number of employees | employee |  | 3 |  |  |  |
Vesting period of employer discretionary contribution |  | 2 years |  |  |  |
SERP [Member] | Four Participants [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Employer discretionary contribution |  |  | $ 126,058 |  |  |
Defined contribution plan, number of employees | employee |  |  | 4 |  |  |
Defined benefit plan participants compensation expense |  |  |  | $ 63,029 |  |

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- Definition A percentage calculated as a basis for determining the 25-year average return on pension portfolio assets. + References No definition available. + Details
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- Definition A percentage calculated as a basis for determining the expected 25-year average return on pension portfolio assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References No definition available. + Details
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- Definition Period For Average Return On Pension Portfolio Assets + References No definition available. + Details
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- Definition Represents the vesting period of a discretionary contribution to benefit plan on the part of employer. + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Number of employees eligible to participate in defined contribution plan. + References No definition available. + Details
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- Definition Description of modification of award under share-based payment arrangement. Includes, but is not limited to, terms for expiration date, vesting rights and exercise price. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=120381028&loc=d3e5070-113901 + Details
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