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Borrowed Funds (Contractual Maturities of All Long Term Borrowings) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Debt Instrument [Line Items] |  |
Due in 2014 | $ 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear | $ 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
Due in 2015 | 35,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths | 35,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
Due in 2016 | 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo | 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
Due in 2017 | 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree | 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
Due in 2018 | 70,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour | 70,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
Due in 2019 | 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive | 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
Thereafter | 77,606 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive | 77,672 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
Total long-term debt | 182,606 us-gaap_LongTermDebt | 182,672 us-gaap_LongTermDebt
Fixed Rate [Member] |  |
Debt Instrument [Line Items] |  |
Due in 2014 | 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_LongtermDebtTypeAxis = func_FixedRateMember |
Due in 2015 | 30,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths / us-gaap_LongtermDebtTypeAxis = func_FixedRateMember |
Due in 2016 | 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_LongtermDebtTypeAxis = func_FixedRateMember |
Due in 2017 | 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_LongtermDebtTypeAxis = func_FixedRateMember |
Due in 2018 | 70,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_LongtermDebtTypeAxis = func_FixedRateMember |
Due in 2019 | 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive / us-gaap_LongtermDebtTypeAxis = func_FixedRateMember |
Thereafter | 46,677 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive / us-gaap_LongtermDebtTypeAxis = func_FixedRateMember |
Total long-term debt | 146,677 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = func_FixedRateMember |
Floating Rate [Member] |  |
Debt Instrument [Line Items] |  |
Due in 2014 | 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear / us-gaap_LongtermDebtTypeAxis = func_FloatingRateMember |
Due in 2015 | 5,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths / us-gaap_LongtermDebtTypeAxis = func_FloatingRateMember |
Due in 2016 | 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_LongtermDebtTypeAxis = func_FloatingRateMember |
Due in 2017 | 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_LongtermDebtTypeAxis = func_FloatingRateMember |
Due in 2018 | 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_LongtermDebtTypeAxis = func_FloatingRateMember |
Due in 2019 | 0 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive / us-gaap_LongtermDebtTypeAxis = func_FloatingRateMember |
Thereafter | 30,929 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive / us-gaap_LongtermDebtTypeAxis = func_FloatingRateMember |
Total long-term debt | $ 35,929 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = func_FloatingRateMember |

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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- Definition Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the remainder of the fiscal year following the latest fiscal year ended. + References No definition available. + Details
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