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Summary of Significant Accounting Policies (Details) (USD $) | 12 Months Ended | 4 Months Ended | 8 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Apr. 30, 2014 | Dec. 31, 2014
Immaterial error correction | The cumulative impact of the error was $.5 million of cash surrender value that built up over time which should have been recorded to non-taxable other income, with an immaterial effect on any one period. The Company determined that the insurance policy, of which the Company was the owner and beneficiary, had been purchased as a Key Man Whole Life Policy on a former Chief Executive Officer of the Company. The accumulated cash value on the policy was determined to be a Bank Owned Life Insurance asset. Accordingly, the opening balance of retained earnings at January 1, 2013 has been adjusted by $.5 million. Furthermore, the Bank Owned Life Insurance asset at December 31, 2013 on the Consolidated Statement of Condition was adjusted by $.5 million. The correction of this error also affected the Consolidated Statement of Operations and the Consolidated Statement of Cash Flows for the year ended December 31, 2013. |  |  |
Loans and leases receivable, net of deferred income | $ 839,991,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome | $ 810,240,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome |  | $ 839,991,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Dividend income, operating | 290,677 us-gaap_DividendIncomeOperating | 199,500 us-gaap_DividendIncomeOperating |  |
Allowance for unfunded loan commitments | 51,950 func_AllowanceForUnfundedLoanCommitments | 49,400 func_AllowanceForUnfundedLoanCommitments |  | 51,950 func_AllowanceForUnfundedLoanCommitments
Property, plant and equipment, depreciation methods | straight-line method |  |  |
Share-based compensation arrangement by share-based payment award, number of shares authorized | 185,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized |  |  | 185,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Share-based compensation | 134,000 us-gaap_ShareBasedCompensation | 88,000 us-gaap_ShareBasedCompensation |  |
Common Stock, Par or Stated Value Per Share | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare |  | $ 0.01 us-gaap_CommonStockParOrStatedValuePerShare
Preferred Stock, Par or Stated Value Per Share | $ 0 us-gaap_PreferredStockParOrStatedValuePerShare | $ 0 us-gaap_PreferredStockParOrStatedValuePerShare |  | $ 0 us-gaap_PreferredStockParOrStatedValuePerShare
Stock repurchased during period, shares | 0 us-gaap_StockRepurchasedDuringPeriodShares |  |  |
Scenario, Plan [Member] |  |  |  |
Non-employee annual retainer paid in stock awards |  |  | 10,000 func_NonEmployeeAnnualRetainerPaidInStockAwards / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPlanMember | 10,000 func_NonEmployeeAnnualRetainerPaidInStockAwards / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPlanMember
Stock issued during period, value, issued for services |  |  | 5,000 us-gaap_StockIssuedDuringPeriodValueIssuedForServices / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPlanMember |
Immediate vested shares | 1,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPlanMember |  |  | 1,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPlanMember
Performance Shares [Member] |  |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period | 3 years |  |  |
Director [Member] |  |  |  |
Immediate vested shares | 17,779 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember | 11,304 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  | 17,779 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember
Immediate vestes shares, per share value | $ 8.78 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember | $ 7.96 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  | $ 8.78 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember
Stock compensation expense | 134,060 us-gaap_DeferredCompensationArrangementWithIndividualAllocatedShareBasedCompensationExpense / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember | 88,000 us-gaap_DeferredCompensationArrangementWithIndividualAllocatedShareBasedCompensationExpense / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  |
Parent Company [Member] |  |  |  |
Share-based compensation | 134,000 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 88,000 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Liberty Mews Limited Partnership [Member] |  |  |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest | 99.90%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest / dei_LegalEntityAxis = func_LibertyMewsLimitedPartnershipMember |  |  |
Maximum [Member] | Premises [Member] |  |  |  |
Property, plant and equipment, useful life | 32 years |  |  |
Maximum [Member] | Furniture and Equipment [Member] |  |  |  |
Property, plant and equipment, useful life | 20 years |  |  |
Minimum [Member] | Premises [Member] |  |  |  |
Property, plant and equipment, useful life | 18 years |  |  |
Minimum [Member] | Furniture and Equipment [Member] |  |  |  |
Property, plant and equipment, useful life | 3 years |  |  |
Western Maryland and Northeasten Virginia [Member] | Loans Receivable [Member] |  |  |  |
Concentration Risk, Percentage | 12.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_LoansReceivableMember / us-gaap_StatementGeographicalAxis = func_WesternMarylandAndNortheastenVirginiaMember |  |  |
Loans and leases receivable, net of deferred income | 99,000,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_LoansReceivableMember / us-gaap_StatementGeographicalAxis = func_WesternMarylandAndNortheastenVirginiaMember |  |  | 99,000,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_LoansReceivableMember / us-gaap_StatementGeographicalAxis = func_WesternMarylandAndNortheastenVirginiaMember
Western Maryland and Northeasten Virginia [Member] | Loans Receivable [Member] | Nonperforming Financing Receivable [Member] |  |  |  |
Loans and leases receivable, net of deferred income | 7,000,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember / us-gaap_StatementGeographicalAxis = func_WesternMarylandAndNortheastenVirginiaMember |  |  | 7,000,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember / us-gaap_StatementGeographicalAxis = func_WesternMarylandAndNortheastenVirginiaMember
Western Maryland and Northeasten Virginia [Member] | Loans Receivable [Member] | Performing Financing Receivable [Member] |  |  |  |
Loans and leases receivable, net of deferred income | 93,000,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember / us-gaap_StatementGeographicalAxis = func_WesternMarylandAndNortheastenVirginiaMember |  |  | 93,000,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_LoansReceivableMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember / us-gaap_StatementGeographicalAxis = func_WesternMarylandAndNortheastenVirginiaMember
Western Maryland and Northeasten Virginia [Member] | Loans Receivable [Member] | Performing According to Modified Terms [Member] |  |  |  |
Loans and leases receivable, net of deferred income | 3,000,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_PerformingAccordingToModifiedTermsMember / us-gaap_StatementGeographicalAxis = func_WesternMarylandAndNortheastenVirginiaMember |  |  | 3,000,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_PerformingAccordingToModifiedTermsMember / us-gaap_StatementGeographicalAxis = func_WesternMarylandAndNortheastenVirginiaMember
Western Maryland and Northeasten Virginia [Member] | Loans Receivable [Member] | Performing Impaired [Member] |  |  |  |
Loans and leases receivable, net of deferred income | $ 4,000,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_PerformingImpairedMember / us-gaap_StatementGeographicalAxis = func_WesternMarylandAndNortheastenVirginiaMember |  |  | $ 4,000,000 us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_LoansReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = func_PerformingImpairedMember / us-gaap_StatementGeographicalAxis = func_WesternMarylandAndNortheastenVirginiaMember
Western Maryland and Northeasten Virginia [Member] | Real Estate [Member] |  |  |  |
Concentration Risk, Percentage | 11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_RealEstateMember / us-gaap_StatementGeographicalAxis = func_WesternMarylandAndNortheastenVirginiaMember |  |  |

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