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Parent Company Only Financial Information (Condensed Statements of Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Interest Expense	$ 10,870us-gaap_InterestExpense	$ 11,732us-gaap_InterestExpense
Other Noninterest Expense	5,790us-gaap_OtherNoninterestExpense	6,687us-gaap_OtherNoninterestExpense
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	6,868us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	8,697us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income Tax Expense (Benefit)	1,271us-gaap_IncomeTaxExpenseBenefit	2,222us-gaap_IncomeTaxExpenseBenefit
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	5,597us-gaap_NetIncomeLoss	6,475us-gaap_NetIncomeLoss
Parent Company [Member]
Investment Income, Dividend	10,972us-gaap_InvestmentIncomeDividend / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	0us-gaap_InvestmentIncomeDividend / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest and Other Income	240us-gaap_InterestAndOtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	469us-gaap_InterestAndOtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total Income	11,212us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	469us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest Expense	2,492us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	2,881us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other Noninterest Expense	354us-gaap_OtherNoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	513us-gaap_OtherNoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating Costs and Expenses	2,846us-gaap_OperatingCostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	3,394us-gaap_OperatingCostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	8,366us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(2,925)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income Tax Expense (Benefit)	(3,120)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(1,002)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net loss before equity in undistributed net loss of subsidiaries	11,486func_IncomeLossFromContinuingOperationsBeforeEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	(1,923)func_IncomeLossFromContinuingOperationsBeforeEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income (Loss) from Equity Method Investments	(5,889)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	8,398us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	5,597us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	6,475us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Parent Company [Member] | First United Bank & Trust [Member]
Income (Loss) from Equity Method Investments	(5,870)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = func_FirstUnitedBankTrustMember	8,424us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = func_FirstUnitedBankTrustMember
Parent Company [Member] | Other Non-Bank Equity Method Investments [Member]
Income (Loss) from Equity Method Investments	$ (19)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = func_OtherNonBankEquityMethodInvestmentsMember	$ (26)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = func_OtherNonBankEquityMethodInvestmentsMember

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