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Loans And Related Allowance For Loan Losses (Modification of Troubled Debt Restructuring by Class) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 loan | Jun. 30, 2014 loan
Temporary Rate Modification [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 | 1
Recorded Investment | $ 0 | $ 90
Temporary Rate Modification [Member] | Commercial Real Estate- Non Owner-Occupied [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 | 0
Recorded Investment | 0 | 0
Temporary Rate Modification [Member] | Commercial Real Estate- All Other CRE [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 | 0
Recorded Investment | 0 | 0
Temporary Rate Modification [Member] | Acquisition and Development- 1-4 Family Residential Construction [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 | 0
Recorded Investment | 0 | 0
Temporary Rate Modification [Member] | Acquisition and Development- All Other A&D [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 | 0
Recorded Investment | 0 | 0
Temporary Rate Modification [Member] | Commercial Portfolio [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 | 0
Recorded Investment | 0 | 0
Temporary Rate Modification [Member] | Residential Mortgage- Term [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 | 1
Recorded Investment | 0 | 90
Temporary Rate Modification [Member] | Residential Mortgage- Home Equity [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 | 0
Recorded Investment | 0 | 0
Temporary Rate Modification [Member] | Consumer Portfolio [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 | 0
Recorded Investment | 0 | 0
Extension Of Maturity [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 | 2
Recorded Investment | 0 | 277
Extension Of Maturity [Member] | Commercial Real Estate- Non Owner-Occupied [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 | 2
Recorded Investment | 0 | 277
Extension Of Maturity [Member] | Commercial Real Estate- All Other CRE [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 | 0
Recorded Investment | 0 | 0
Extension Of Maturity [Member] | Acquisition and Development- 1-4 Family Residential Construction [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 | 0
Recorded Investment | 0 | 0
Extension Of Maturity [Member] | Acquisition and Development- All Other A&D [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 | 0
Recorded Investment | 0 | 0
Extension Of Maturity [Member] | Commercial Portfolio [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 | 0
Recorded Investment | 0 | 0
Extension Of Maturity [Member] | Residential Mortgage- Term [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 | 0
Recorded Investment | 0 | 0
Extension Of Maturity [Member] | Residential Mortgage- Home Equity [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 | 0
Recorded Investment | 0 | 0
Extension Of Maturity [Member] | Consumer Portfolio [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 | 0
Recorded Investment | 0 | 0
Modification Of Payment And Other Terms [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 3 | 4
Recorded Investment | 2,173 | 2,627
Modification Of Payment And Other Terms [Member] | Commercial Real Estate- Non Owner-Occupied [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 | 0
Recorded Investment | 0 | 0
Modification Of Payment And Other Terms [Member] | Commercial Real Estate- All Other CRE [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 3 | 4
Recorded Investment | 2,173 | 2,627
Modification Of Payment And Other Terms [Member] | Acquisition and Development- 1-4 Family Residential Construction [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 | 0
Recorded Investment | 0 | 0
Modification Of Payment And Other Terms [Member] | Acquisition and Development- All Other A&D [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 | 0
Recorded Investment | 0 | 0
Modification Of Payment And Other Terms [Member] | Commercial Portfolio [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 | 0
Recorded Investment | 0 | 0
Modification Of Payment And Other Terms [Member] | Residential Mortgage- Term [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 | 0
Recorded Investment | 0 | 0
Modification Of Payment And Other Terms [Member] | Residential Mortgage- Home Equity [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 | 0
Recorded Investment | 0 | 0
Modification Of Payment And Other Terms [Member] | Consumer Portfolio [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 0 | 0
Recorded Investment | $ 0 | $ 0

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings during the period. + References No definition available. + Details
Name: | func_NumberOfContracts
Namespace Prefix: | func_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings during the period. + References No definition available. + Details
Name: | func_RecordedInvestment
Namespace Prefix: | func_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration