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Junior Subordinated Debentures And Restrictions On Dividends (Narrative) (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Aggregated liquidation amount | $ 62,000 us-gaap_CommonStockValue | $ 62,000 us-gaap_CommonStockValue
Maximum Allowable Period Of Interest Deferment | 20 |
First United Statutory Trust I And II [Member] |  |
Trust preferred securities | 30,000,000 us-gaap_PreferredStockValueOutstanding / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = func_FirstUnitedStatutoryTrustIAndIiMember |
Aggregated liquidation amount | 900,000 us-gaap_CommonStockValue / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = func_FirstUnitedStatutoryTrustIAndIiMember |
Debenture issue date | March 2004 |
Junior Subordinated Debt [Member] |  |
Debenture issue date | December 2004 |
Debt Instrument, Face Amount | 5,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember |
Variable interest rate | fixed rate of 5.88% for the first five years, payable quarterly, and converted to a floating rate in March 2010 based on the three month LIBOR plus 185 basis points |
Reporting date interest rate | 2.09%us-gaap_DebtInstrumentInterestRateAtPeriodEnd / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember |
Maturity date | 2015 |
Earliest availability for redemption | 5 years |
Fixed interest rate | 5.88%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember |
Debenture Rate Conversion Date | March 2010 |
Junior Subordinated Debt [Member] | First United Statutory Trust I [Member] |  |
Debenture issued to unconsolidated subsidiary | 20,600,000 us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = func_FirstUnitedStatutoryTrustIMember |
Variable interest rate | three-month LIBOR plus 275 basis points |
Reporting date interest rate | 2.99%us-gaap_DebtInstrumentInterestRateAtPeriodEnd / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = func_FirstUnitedStatutoryTrustIMember |
Maturity date | 2034 |
Earliest availability for redemption | 5 years |
Junior Subordinated Debt [Member] | First United Statutory Trust II [Member] |  |
Debenture issued to unconsolidated subsidiary | 10,300,000 us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = func_FirstUnitedStatutoryTrustIiMember |
Variable interest rate | three-month LIBOR plus 275 basis points |
Reporting date interest rate | 2.99%us-gaap_DebtInstrumentInterestRateAtPeriodEnd / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = func_FirstUnitedStatutoryTrustIiMember |
Maturity date | 2034 |
Earliest availability for redemption | 5 years |
Junior Subordinated Debt [Member] | December 2009 First United Statutory Trust III [Member] |  |
Trust preferred securities | 7,000,000 us-gaap_PreferredStockValueOutstanding / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = func_December2009FirstUnitedStatutoryTrustIiiMember |
Aggregated liquidation amount | 200,000 us-gaap_CommonStockValue / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = func_December2009FirstUnitedStatutoryTrustIiiMember |
Debenture issue date | December 2009 |
Fixed interest rate | 9.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = func_December2009FirstUnitedStatutoryTrustIiiMember |
Junior Subordinated Debt [Member] | January 2010 First United Statutory Trust III [Member] |  |
Trust preferred securities | 3,500,000 us-gaap_PreferredStockValueOutstanding / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = func_January2010FirstUnitedStatutoryTrustIiiMember |
Aggregated liquidation amount | 100,000 us-gaap_CommonStockValue / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = func_January2010FirstUnitedStatutoryTrustIiiMember |
Debenture issue date | January 2010 |
Fixed interest rate | 9.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_JuniorSubordinatedDebtMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = func_January2010FirstUnitedStatutoryTrustIiiMember |
Cumulative Preferred Stock [Member] |  |
Quarterly preferred dividends accrual | 400,000 us-gaap_DividendsPreferredStockCash / us-gaap_LongtermDebtTypeAxis = us-gaap_CumulativePreferredStockMember |
TPS Debentures [Member] | December 2009 First United Statutory Trust III [Member] |  |
Debenture issued to unconsolidated subsidiary | 7,200,000 us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust / us-gaap_LongtermDebtTypeAxis = func_TpsDebenturesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = func_December2009FirstUnitedStatutoryTrustIiiMember |
Maturity date | 2040 |
Earliest availability for redemption | 5 years |
Fixed interest rate | 9.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = func_TpsDebenturesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = func_December2009FirstUnitedStatutoryTrustIiiMember |
TPS Debentures [Member] | January 2010 First United Statutory Trust III [Member] |  |
Debenture issued to unconsolidated subsidiary | $ 3,600,000 us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust / us-gaap_LongtermDebtTypeAxis = func_TpsDebenturesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = func_January2010FirstUnitedStatutoryTrustIiiMember |
Maturity date | 2040 |
Earliest availability for redemption | 5 years |
Fixed interest rate | 9.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = func_TpsDebenturesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = func_January2010FirstUnitedStatutoryTrustIiiMember |

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- Definition Debenture Rate Conversion Date + References No definition available. + Details
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Balance Type: | na
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- Definition Date when the debt instrument was issued, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.). + References No definition available. + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc) + References No definition available. + Details
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Namespace Prefix: | func_
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- Definition Debt Instrument Redemption After First Issuance + References No definition available. + Details
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- Definition Maximum Allowable Period Of Interest Deferment + References No definition available. + Details
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- Definition Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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- Definition Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: 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 Value of all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by shareholders, which is net of related treasury stock. May be all or a portion of the number of preferred shares authorized. These shares represent the ownership interest of the preferred shareholders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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