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Fair Value Of Financial Instruments (Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques) (Details) (Fair Value, Inputs, Level 3 [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014
Collateralized debt obligations [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | $ 23,093 |
Significant Unoservable Inputs | Discount Rate |
Valuation Technique | Discounted Cash Flow |
Collateralized debt obligations [Member] | Unobservable Input - Discount Rate [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Input, Unobservable Input Value, Description | Swap+17%; Range of Libor+ 6.00% to 18% |
Interest Rate Swap [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Recurring | (365) |
Significant Unoservable Inputs | Reuters Third Party Market Quote |
Valuation Technique | Discounted Cash Flow |
Interest Rate Swap [Member] | Unobservable Input - Reuters Third Party Market Quote [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Inputs, Discount Rate | 99.90% |
Impaired Loans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Nonrecurring | 10,819 |
Significant Unoservable Inputs | Marketability Discount |
Valuation Technique | Market Comparable Properties |
Impaired Loans [Member] | Unobservable Input - Marketability Discount [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Inputs, Discount Rate | 10.00% | [1]
Other Real Estate Owned [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure, Nonrecurring | $ 960 |
Significant Unoservable Inputs | Marketability Discount |
Valuation Technique | Market Comparable Properties |
Minimum [Member] | Other Real Estate Owned [Member] | Unobservable Input - Marketability Discount [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Inputs, Discount Rate | 10.00% | [1]
Maximum [Member] | Other Real Estate Owned [Member] | Unobservable Input - Marketability Discount [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Inputs, Discount Rate | 10.00% |
Weighted Average [Member] | Interest Rate Swap [Member] | Unobservable Input - Reuters Third Party Market Quote [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Inputs, Discount Rate | 99.90% |
Weighted Average [Member] | Impaired Loans [Member] | Unobservable Input - Marketability Discount [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value Inputs, Discount Rate | 10.00% |
[1] | Range would include discounts taken since appraisal and estimated values

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- Definition Fair Value Input, Unobservable Input Value, Description + References No definition available. + Details
Name: | func_FairValueInputUnobservableInputValueDescription
Namespace Prefix: | func_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Description of significant assumptions used by management to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 + Details
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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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Namespace Prefix: | us-gaap_
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