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Other Real Estate Owned (Schedule of Real Estate Properties) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Total OREO	$ 12,932us-gaap_RealEstateAcquiredThroughForeclosure	$ 17,031us-gaap_RealEstateAcquiredThroughForeclosure
Commercial Real Estate [Member]
Total OREO	1,772us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember	5,306us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember
Acquisition and Development [Member]
Total OREO	9,263us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_CommercialAndResidentialConstructionPortfolioSegmentMember	10,509us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = func_CommercialAndResidentialConstructionPortfolioSegmentMember
Residential Mortgage [Member]
Total OREO	$ 1,897us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	$ 1,216us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember

X

- Definition

Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4437-111522



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule III

-Article 5

+ Details

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- Details

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- Details

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