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Loans And Related Allowances For Loan Losses (Modification of Troubled Debt Restructuring By Class) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 loan | Mar. 31, 2013 loan
Temporary Rate Modification [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 1 | 1
Recorded Investment | $ 90 | $ 172
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 and industrial [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 | 1 | 1
Recorded Investment | 90 | 172
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 [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 | 2 | 4
Recorded Investment | 277 | 520
Extension Of Maturity [Member] | Commercial real estate- non owner-occupied [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 2 | 2
Recorded Investment | 277 | 268
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 | 2
Recorded Investment | 0 | 252
Extension Of Maturity [Member] | Commercial and industrial [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 [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 | 1 | 0
Recorded Investment | 454 | 0
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 | 1 | 0
Recorded Investment | 454 | 0
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 and industrial [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 [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