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Junior Subordinated Debentures and Restrictions on Dividends (Narrative) (Details) (USD $)
3 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Jan. 31, 2015
Apr. 30, 2014
Dec. 31, 2014
Trust common equity $ 62,000us-gaap_CommonStockValue       $ 62,000us-gaap_CommonStockValue
Preferred stock dividends deferred (675,000)us-gaap_PreferredStockAmountOfPreferredDividendsInArrears (441,000)us-gaap_PreferredStockAmountOfPreferredDividendsInArrears      
First United Statutory Trust I And II Member          
Trust preferred securities 30,000,000us-gaap_PreferredStockValueOutstanding
/ dei_LegalEntityAxis
= func_FirstUnitedStatutoryTrustIAndIiMember
       
Trust common equity 900,000us-gaap_CommonStockValue
/ dei_LegalEntityAxis
= func_FirstUnitedStatutoryTrustIAndIiMember
       
Debenture issue date 2004-03        
Junior Subordinated Debt [Member]          
Debenture issue date 2004-12        
Debt instrument, face amount 5,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
       
Variable interest rate three month LIBOR plus 185 basis points        
Debt instrument, interest rate, effective percentage 9.88%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
       
Debenture face value 5,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
       
Fixed interest rate 5.88%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
       
Debenture rate conversion date 2010-03        
Maximum allowable period of interest deferment 5 years        
Junior Subordinated Debt [Member] | First United Statutory Trust I Member          
Debenture issued to unconsolidated subsidiary 20,600,000us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
/ dei_LegalEntityAxis
= func_FirstUnitedStatutoryTrustIMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
       
Variable interest rate three-month LIBOR plus 275 basis points        
Debt instrument, interest rate, effective percentage 3.02%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ dei_LegalEntityAxis
= func_FirstUnitedStatutoryTrustIMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
       
Maturity date 2034        
Earliest availability for redemption 5 years        
Junior Subordinated Debt [Member] | First United Statutory Trust II Member          
Debenture issued to unconsolidated subsidiary 10,300,000us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
/ dei_LegalEntityAxis
= func_FirstUnitedStatutoryTrustIiMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
       
Variable interest rate three-month LIBOR plus 275 basis points        
Debt instrument, interest rate, effective percentage 3.02%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ dei_LegalEntityAxis
= func_FirstUnitedStatutoryTrustIiMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
       
Maturity date 2034        
Earliest availability for redemption 5 years        
Junior Subordinated Debt [Member] | December 2009 First United Statutory Trust III Member          
Trust preferred securities 7,000,000us-gaap_PreferredStockValueOutstanding
/ dei_LegalEntityAxis
= func_December2009FirstUnitedStatutoryTrustIiiMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
       
Trust common equity 200,000us-gaap_CommonStockValue
/ dei_LegalEntityAxis
= func_December2009FirstUnitedStatutoryTrustIiiMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
       
Debenture issue date 2009-12        
Debenture issued to unconsolidated subsidiary 7,200,000us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
/ dei_LegalEntityAxis
= func_December2009FirstUnitedStatutoryTrustIiiMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
       
Maturity date 2040        
Earliest availability for redemption 5 years        
Fixed interest rate 9.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= func_December2009FirstUnitedStatutoryTrustIiiMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
       
Junior Subordinated Debt [Member] | January 2010 First United Statutory Trust III Member          
Trust preferred securities 3,500,000us-gaap_PreferredStockValueOutstanding
/ dei_LegalEntityAxis
= func_January2010FirstUnitedStatutoryTrustIiiMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
       
Trust common equity 100,000us-gaap_CommonStockValue
/ dei_LegalEntityAxis
= func_January2010FirstUnitedStatutoryTrustIiiMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
       
Debenture issue date 2010-01        
Debenture issued to unconsolidated subsidiary 3,600,000us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
/ dei_LegalEntityAxis
= func_January2010FirstUnitedStatutoryTrustIiiMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
       
Maturity date 2040        
Earliest availability for redemption 5 years        
Fixed interest rate 9.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= func_January2010FirstUnitedStatutoryTrustIiiMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
       
Cumulative Preferred Stock [Member]          
Quarterly preferred dividends accrual/paid $ 400,000us-gaap_DividendsPreferredStockCash
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CumulativePreferredStockMember
  $ 700,000us-gaap_DividendsPreferredStockCash
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CumulativePreferredStockMember
$ 6,500,000us-gaap_DividendsPreferredStockCash
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CumulativePreferredStockMember