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Regulatory Capital Requirements (Narrative) (Details) (USD $)
0 Months Ended 12 Months Ended 0 Months Ended
Jan. 30, 2009
Jan. 30, 2009
Dec. 31, 2014
Dec. 31, 2013
Nov. 15, 2014
Aug. 15, 2014
May 15, 2014
Dec. 17, 2014
Sep. 17, 2014
Jun. 17, 2014
Mar. 17, 2014
Sep. 15, 2014
Dec. 15, 2014
Jun. 16, 2014
Mar. 14, 2014
Feb. 17, 2015
Preferred stock, shares issued 30,000us-gaap_PreferredStockSharesIssued 30,000us-gaap_PreferredStockSharesIssued                            
Class of warrant or right, number of securities called by warrants or rights 326,323us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights 326,323us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights                            
Class of warrant or right, exercise price of warrants or rights 13.79us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights 13.79us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights                            
Proceeds from issuance of preferred stock and preference stock $ 30,000,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock $ 30,000,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock                            
FHLB available credit     32,700,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds                          
Tier One Risk Based Capital     149,130,000us-gaap_TierOneRiskBasedCapital 144,303,000us-gaap_TierOneRiskBasedCapital                        
Preferred stock dividends     2,595,000us-gaap_DividendsPreferredStock 1,709,000us-gaap_DividendsPreferredStock                        
Unsecured Debt [Member]                                
Line of credit facility, current borrowing capacity     70,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
                         
Secured Debt [Member]                                
Line of credit facility, current borrowing capacity     26,900,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
                         
TPS Debentures [Member]                                
Tier One Risk Based Capital     40,300,000us-gaap_TierOneRiskBasedCapital
/ us-gaap_LongtermDebtTypeAxis
= func_TpsDebenturesMember
                         
Cumulative Preferred Stock [Member]                                
Preferred stock dividends paid, cash     400,000us-gaap_DividendsPreferredStockCash
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CumulativePreferredStockMember
                         
Preferred stock dividends         700,000us-gaap_DividendsPreferredStock
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CumulativePreferredStockMember
700,000us-gaap_DividendsPreferredStock
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CumulativePreferredStockMember
6,500,000us-gaap_DividendsPreferredStock
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CumulativePreferredStockMember
                 
Preferred stock, dividend payment terms     February 15th, May 15th, August 15th and November 15th                          
Preferred dividend payment dates     February 15th, May 15th, August 15th and November 15th                          
Preferred dividend deferment date     November 15, 2010                          
Quarterly preferred dividends accrual     400,000us-gaap_DividendsPreferredStockCash
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CumulativePreferredStockMember
                         
First United Corporation [Member]                                
Preferred stock dividends paid, cash     11,000,000us-gaap_DividendsPreferredStockCash
/ dei_LegalEntityAxis
= func_FirstUnitedCorporationMember
                         
Quarterly preferred dividends accrual     11,000,000us-gaap_DividendsPreferredStockCash
/ dei_LegalEntityAxis
= func_FirstUnitedCorporationMember
                         
First United Statutory Trust I [Member]                                
Payments of deferred interest               77,783func_PaymentsOfDeferredInterest
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= func_FirstUnitedStatutoryTrustIMember
78,572func_PaymentsOfDeferredInterest
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= func_FirstUnitedStatutoryTrustIMember
78,604func_PaymentsOfDeferredInterest
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= func_FirstUnitedStatutoryTrustIMember
1,024,000func_PaymentsOfDeferredInterest
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= func_FirstUnitedStatutoryTrustIMember
         
Payments of current interest                     77,166func_PaymentsOfCurrentInterest
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= func_FirstUnitedStatutoryTrustIMember
         
First United Statutory Trust II [Member]                                
Payments of deferred interest               155,558func_PaymentsOfDeferredInterest
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= func_FirstUnitedStatutoryTrustIiMember
157,136func_PaymentsOfDeferredInterest
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= func_FirstUnitedStatutoryTrustIiMember
157,202func_PaymentsOfDeferredInterest
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= func_FirstUnitedStatutoryTrustIiMember
2,048,000func_PaymentsOfDeferredInterest
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= func_FirstUnitedStatutoryTrustIiMember
266,650func_PaymentsOfDeferredInterest
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= func_FirstUnitedStatutoryTrustIiMember
       
Payments of current interest                     154,325func_PaymentsOfCurrentInterest
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= func_FirstUnitedStatutoryTrustIiMember
         
First United Statutory Trust III [Member]                                
Payments of deferred interest                         266,650func_PaymentsOfDeferredInterest
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= func_FirstUnitedStatutoryTrustIiiMember
266,650func_PaymentsOfDeferredInterest
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= func_FirstUnitedStatutoryTrustIiiMember
3,763,000func_PaymentsOfDeferredInterest
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= func_FirstUnitedStatutoryTrustIiiMember
 
Payments of current interest                             266,650func_PaymentsOfCurrentInterest
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= func_FirstUnitedStatutoryTrustIiiMember
 
Subsequent Event [Member] | Cumulative Preferred Stock [Member]                                
Preferred stock dividends                               $ 700,000us-gaap_DividendsPreferredStock
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CumulativePreferredStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember