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Investment Securities (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Investments [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	$ 108,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses	$ 8,361,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	13,864,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses	25,488,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
Available-for-sale securities pledged as collateral		192,000,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral	175,000,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
US Treasury Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature	U.S. Government Treasuries – Available for Sale - Two U.S. government treasuries have been in an unrealized loss position for less than 12 months as of December 31, 2014. The securities are of the highest investment grade and the Corporation does not intend to sell them, and it is not more likely than not that the Corporation will be required to sell them before recovery of their amortized cost basis, which may be at maturity. Accordingly, management does not consider this investment to be other-than-temporarily impaired at December 31, 2014. There were no U.S. government treasuries in an unrealized loss position for 12 months or more.
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	2us-gaap_AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear / us-gaap_DebtSecurityAxis = us-gaap_USTreasurySecuritiesMember
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	0us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear / us-gaap_DebtSecurityAxis = us-gaap_USTreasurySecuritiesMember
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	11,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_USTreasurySecuritiesMember
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_USTreasurySecuritiesMember
US Government Agencies [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature	U.S. Government Agencies – Available for Sale – There were no U.S. government agencies in an unrealized loss position for less than 12 months as of December 31, 2014. There were three U.S. government agencies in an unrealized loss position for 12 months or more. The securities are of the highest investment grade and the Corporation does not intend to sell them, and it is not more likely than not that the Corporation will be required to sell them before recovery of their amortized cost basis, which may be at maturity. Accordingly, management does not consider these investments to be other-than-temporarily impaired at December 31, 2014.
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	0us-gaap_AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	3us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember	3,154,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	253,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember	2,067,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature	U.S. Government Agencies – Held to Maturity – There were no U.S. government agencies in an unrealized loss position at December 31, 2014.
Residential mortgage-backed agencies [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature	Residential Mortgage-Backed Agencies – Available for Sale - There were no residential mortgage-backed agencies in an unrealized loss position for less than 12 months as of December 31, 2014. There were three residential mortgage-backed agency securities in an unrealized loss position for 12 months or more. The securities are of the highest investment grade and the Corporation does not intend to sell them, and it is not more likely than not that the Corporation will be required to sell the securities before recovery of their amortized cost basis, which may be at maturity. Accordingly, management does not consider these investments to be other-than-temporarily impaired at December 31, 2014.
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	0us-gaap_AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear / us-gaap_DebtSecurityAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	3us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear / us-gaap_DebtSecurityAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember	1,801,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	412,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember	3,022,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature	Residential Mortgage-Backed Agencies – Held to Maturity – There were two residential mortgage-backed agencies in an unrealized loss position for less than 12 months as of December 31, 2014. The Corporation has the intent and ability to hold the investments to maturity. Accordingly, management does not consider these investments to be other-than-temporarily impaired at December 31, 2014. There were no residential mortgage-backed agencies in an unrealized loss position for 12 months or more.
Commercial mortgage-backed agencies [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature	Commercial Mortgage-Backed Agencies – Available for Sale – There were two commercial mortgage-backed agencies in an unrealized loss position for less than 12 months as of December 31, 2014. There was one commercial mortgage-backed agency security in an unrealized loss position for 12 months or more. The securities are of the highest investment grade and the Corporation does not intend to sell them, and it is not more likely than not that the Corporation will be required to sell them before recovery of their amortized cost basis, which may be at maturity. Accordingly, management does not consider this investment to be other-than-temporarily impaired at December 31, 2014.
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	2us-gaap_AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear / us-gaap_DebtSecurityAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	1us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear / us-gaap_DebtSecurityAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	97,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_CommercialMortgageBackedSecuritiesMember	1,134,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	6,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_CommercialMortgageBackedSecuritiesMember	0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature	Commercial Mortgage-Backed Agencies – Held to Maturity – There were no commercial mortgage-backed agencies in an unrealized loss position at December 31, 2014.
Collateralized mortgage obligations [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature	Collateralized Mortgage-Obligations – Available for Sale – There were no collateralized mortgage-obligation securities in an unrealized loss position for less than 12 months as of December 31, 2014. In addition, there were no collateralized mortgage-obligation securities in an unrealized loss position for 12 months or more.
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	0us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesMember
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesMember	1,149,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesMember
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesMember	13,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesMember
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature	Collateralized Mortgage-Obligations – Held to Maturity - There were no collateralized mortgage obligations in an unrealized loss position at December 31, 2014.
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	0us-gaap_HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesMember
Obligations of states and political subdivisions [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature	Obligations of State and Political Subdivisions – Available for Sale - No obligations of state and political subdivisions securities have been in an unrealized loss position for less than 12 months at December 31, 2014. There were four securities that have been in an unrealized loss position for 12 months or more. These investments are of investment grade as determined by the major rating agencies and management reviews the ratings of the underlying issuers and performs an in-depth credit analysis on the securities. Management believes that this portfolio is well-diversified throughout the United States, and all bonds continue to perform according to their contractual terms. The Corporation does not intend to sell these investments and it is not more likely than not that the Corporation will be required to sell the investments before recovery of their amortized cost basis, which may be at maturity. Accordingly, management does not consider these investments to be other-than-temporarily impaired at December 31, 2014.
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year	0us-gaap_AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	4us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember	1,123,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	260,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember	0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature	Obligations of State and Political Subdivisions – Held to Maturity – No obligations of state and political subdivisions securities have been in an unrealized loss position for less than 12 months at December 31, 2014. There was one obligations of state and political subdivisions security that has been in an unrealized loss position for 12 months or more. This bond is a Tax Increment Fund (TIF) bond. Management performs an in-depth credit analysis on this security. The Corporation has the intent and ability to hold the investment to maturity. Accordingly, management does not consider this investment to be other-than-temporarily impaired at December 31, 2014.
Collateralized Debt Obligations [Member]
Schedule of Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Nature	Collateralized Debt Obligations – Available for Sale - The $12.9 million in unrealized losses greater than 12 months at December 31, 2014 relates to 14 pooled trust preferred securities that are included in the CDO portfolio. See Note 24 for a discussion of the methodology used by management to determine the fair values of these securities. Based upon a review of credit quality and the cash flow tests performed by the independent third party, management determined that there were no securities that had credit-related non-cash OTTI charges during 2014. The unrealized losses on the remaining securities in the portfolio are primarily attributable to continued depression in market interest rates, marketability, liquidity and the current economic environment.
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	17us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1 / us-gaap_DebtSecurityAxis = us-gaap_CollateralizedDebtObligationsMember
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	14us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear / us-gaap_DebtSecurityAxis = us-gaap_CollateralizedDebtObligationsMember
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_CollateralizedDebtObligationsMember	0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_CollateralizedDebtObligationsMember
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses	$ 12,933,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_CollateralizedDebtObligationsMember	$ 20,386,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_DebtSecurityAxis = us-gaap_CollateralizedDebtObligationsMember
Less Than 12 Months [Member] | Residential mortgage-backed agencies [Member]
Schedule of Investments [Line Items]
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	2us-gaap_HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions / us-gaap_DebtSecurityAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember / us-gaap_RangeAxis = func_LessThan12MonthsMember
Less Than 12 Months [Member] | Obligations of states and political subdivisions [Member]
Schedule of Investments [Line Items]
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	0us-gaap_HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember / us-gaap_RangeAxis = func_LessThan12MonthsMember
Greater Than 12 Months [Member] | Residential mortgage-backed agencies [Member]
Schedule of Investments [Line Items]
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	0us-gaap_HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions / us-gaap_DebtSecurityAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember / us-gaap_RangeAxis = func_GreaterThan12MonthsMember
Greater Than 12 Months [Member] | Obligations of states and political subdivisions [Member]
Schedule of Investments [Line Items]
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	1us-gaap_HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember / us-gaap_RangeAxis = func_GreaterThan12MonthsMember

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Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer.

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The fair value of available-for-sale securities that serve as collateral for borrowings.

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