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Borrowed Funds (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Repurchase agreements secured by available for sale securities		$ 192,000,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral	$ 175,000,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
Federal home loan bank, advances, general debt obligations, maximum amount available	385,000,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaximumAmountAvailable
Federal home loan bank, advances, general debt obligations, amount of available, unused funds	32,700,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds
Borrowing capacity to assets, percentage	29.00%func_BorrowingCapacityToAssets
Securities Sold under Agreements to Repurchase [Member]
Debt Instrument [Line Items]
Repurchase agreements secured by available for sale securities	61,400,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral / us-gaap_DebtInstrumentAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
Federal Home Loan Bank Advances [Member]
Debt Instrument [Line Items]
Repurchase agreements secured by available for sale securities	500,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral / us-gaap_DebtInstrumentAxis = us-gaap_FederalHomeLoanBankAdvancesMember
FHLB advances secured by loans receivable	181,100,000us-gaap_LoansPledgedAsCollateral / us-gaap_DebtInstrumentAxis = us-gaap_FederalHomeLoanBankAdvancesMember
Various Financial Institutions [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	70,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = func_VariousFinancialInstitutionsMember
Federal Reserve Bank [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	26,900,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = func_FederalReserveBankMember
Brokered Money Market Funds [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 49,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = func_BrokeredMoneyMarketFundsMember
Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, term	10 years
Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, term	5 years

X

- Definition

Borrowing capacity to assets, percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	func_
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Balance Type:	na
Period Type:	duration

X

- Definition

The fair value of available-for-sale securities that serve as collateral for borrowings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5086-111524

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- Details

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X

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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X

- Definition

Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822



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 942

-SubTopic 210

-Section S99

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 13

-Subparagraph 3(a)

-Article 9

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X

- Definition

Amount of maximum advances or credit lines available from the Federal Home Loan Bank (FHLB).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822



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-Publisher FASB

-Name Accounting Standards Codification

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.13(3)(a))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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X

- Definition

Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5086-111524



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 45

-Paragraph 1

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- Details

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- Details

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