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Regulatory Capital Requirements (Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital	$ 161,377us-gaap_Capital	$ 161,349us-gaap_Capital
Capital to Risk Weighted Assets	15.40%us-gaap_CapitalToRiskWeightedAssets	15.33%us-gaap_CapitalToRiskWeightedAssets
Capital Required for Capital Adequacy	83,851us-gaap_CapitalRequiredForCapitalAdequacy	84,191us-gaap_CapitalRequiredForCapitalAdequacy
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Capital Required to be Well Capitalized	104,813us-gaap_CapitalRequiredToBeWellCapitalized	105,239us-gaap_CapitalRequiredToBeWellCapitalized
Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Tier One Risk Based Capital	149,130us-gaap_TierOneRiskBasedCapital	144,303us-gaap_TierOneRiskBasedCapital
Tier One Risk Based Capital to Risk Weighted Assets	14.23%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets	13.71%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
Tier One Risk Based Capital Required for Capital Adequacy	41,925us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy	42,096us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Tier One Risk Based Capital Required to be Well Capitalized	62,888us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized	63,144us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Tier One Leverage Capital	149,130us-gaap_TierOneLeverageCapital	144,303us-gaap_TierOneLeverageCapital
Tier One Leverage Capital to Average Assets	11.29%us-gaap_TierOneLeverageCapitalToAverageAssets	11.02%us-gaap_TierOneLeverageCapitalToAverageAssets
Tier One Leverage Capital Required for Capital Adequacy	52,846us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy	52,365us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
Tier One Leverage Capital Required to be Well Capitalized	66,057us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized	65,456us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets	5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
First United Bank & Trust [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital	162,550us-gaap_Capital / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember	169,640us-gaap_Capital / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember
Capital to Risk Weighted Assets	15.60%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember	16.22%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember
Capital Required for Capital Adequacy	83,379us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember	83,693us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember
Capital Required to be Well Capitalized	104,224us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember	104,616us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember
Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember	10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember
Tier One Risk Based Capital	150,433us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember	156,207us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember
Tier One Risk Based Capital to Risk Weighted Assets	14.43%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember	14.93%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember
Tier One Risk Based Capital Required for Capital Adequacy	41,689us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember	41,846us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember
Tier One Risk Based Capital Required to be Well Capitalized	62,534us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember	62,770us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember	6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember
Tier One Leverage Capital	150,433us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember	156,207us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember
Tier One Leverage Capital to Average Assets	11.43%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember	11.97%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember
Tier One Leverage Capital Required for Capital Adequacy	52,642us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember	52,178us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember
Tier One Leverage Capital Required to be Well Capitalized	$ 65,803us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember	$ 65,223us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember	5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = func_FirstUnitedBankTrustMember

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The amount of total capital as defined in the regulations.

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The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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Tier 1 Risk Based Capital as defined in the regulations.

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Tier 1 capital divided by risk weighted assets as defined by regulations.

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-Name Accounting Standards Codification

-Topic 942

-SubTopic 505

-Section 50

-Paragraph 1

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826

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