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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 $ 839,991,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome $ 810,240,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome   $ 839,991,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Dividend income, operating 290,677us-gaap_DividendIncomeOperating 199,500us-gaap_DividendIncomeOperating    
Allowance for unfunded loan commitments 51,950func_AllowanceForUnfundedLoanCommitments 49,400func_AllowanceForUnfundedLoanCommitments   51,950func_AllowanceForUnfundedLoanCommitments
Property, plant and equipment, depreciation methods straight-line method      
Share-based compensation arrangement by share-based payment award, number of shares authorized 185,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized     185,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Share-based compensation 134,000us-gaap_ShareBasedCompensation 88,000us-gaap_ShareBasedCompensation    
Common Stock, Par or Stated Value Per Share $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare   $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Preferred Stock, Par or Stated Value Per Share $ 0us-gaap_PreferredStockParOrStatedValuePerShare $ 0us-gaap_PreferredStockParOrStatedValuePerShare   $ 0us-gaap_PreferredStockParOrStatedValuePerShare
Stock repurchased during period, shares 0us-gaap_StockRepurchasedDuringPeriodShares      
Scenario, Plan [Member]        
Non-employee annual retainer paid in stock awards     10,000func_NonEmployeeAnnualRetainerPaidInStockAwards
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPlanMember
10,000func_NonEmployeeAnnualRetainerPaidInStockAwards
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPlanMember
Stock issued during period, value, issued for services     5,000us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPlanMember
 
Immediate vested shares 1,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPlanMember
    1,000us-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 17,779us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
11,304us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
  17,779us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
Immediate vestes shares, per share value $ 8.78us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
$ 7.96us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
  $ 8.78us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
Stock compensation expense 134,060us-gaap_DeferredCompensationArrangementWithIndividualAllocatedShareBasedCompensationExpense
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
88,000us-gaap_DeferredCompensationArrangementWithIndividualAllocatedShareBasedCompensationExpense
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
   
Parent Company [Member]        
Share-based compensation 134,000us-gaap_ShareBasedCompensation
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
88,000us-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 99,000,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_StatementGeographicalAxis
= func_WesternMarylandAndNortheastenVirginiaMember
    99,000,000us-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 7,000,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ us-gaap_StatementGeographicalAxis
= func_WesternMarylandAndNortheastenVirginiaMember
    7,000,000us-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 93,000,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ us-gaap_StatementGeographicalAxis
= func_WesternMarylandAndNortheastenVirginiaMember
    93,000,000us-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 3,000,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= func_PerformingAccordingToModifiedTermsMember
/ us-gaap_StatementGeographicalAxis
= func_WesternMarylandAndNortheastenVirginiaMember
    3,000,000us-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 $ 4,000,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_LoansReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= func_PerformingImpairedMember
/ us-gaap_StatementGeographicalAxis
= func_WesternMarylandAndNortheastenVirginiaMember
    $ 4,000,000us-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