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Cash And Cash Equivalents (Schedules of Cash and Cash Equivalents) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Cash and Cash Equivalents [Line Items]
Cash and due from banks	$ 27,554us-gaap_CashAndDueFromBanks	$ 32,895us-gaap_CashAndDueFromBanks
Interest bearing deposits in banks	7,897us-gaap_InterestBearingDepositsInBanks	10,168us-gaap_InterestBearingDepositsInBanks
Cash and Due from Banks [Member]
Cash and Cash Equivalents [Line Items]
Interest Rate	0.17%func_InterestRate / us-gaap_CashAndCashEquivalentsAxis = func_CashAndDueFromBanksMember
FHLB [Member]
Cash and Cash Equivalents [Line Items]
Interest bearing deposits in banks	983us-gaap_InterestBearingDepositsInBanks / us-gaap_CashAndCashEquivalentsAxis = func_FhlbMember	1,677us-gaap_InterestBearingDepositsInBanks / us-gaap_CashAndCashEquivalentsAxis = func_FhlbMember
Interest Rate	0.005%func_InterestRate / us-gaap_CashAndCashEquivalentsAxis = func_FhlbMember
FTN [Member]
Cash and Cash Equivalents [Line Items]
Interest bearing deposits in banks	850us-gaap_InterestBearingDepositsInBanks / us-gaap_CashAndCashEquivalentsAxis = func_FtnMember	1,350us-gaap_InterestBearingDepositsInBanks / us-gaap_CashAndCashEquivalentsAxis = func_FtnMember
Interest Rate	0.13%func_InterestRate / us-gaap_CashAndCashEquivalentsAxis = func_FtnMember
M&T Fed Funds Sold [Member]
Cash and Cash Equivalents [Line Items]
Interest bearing deposits in banks	6,064us-gaap_InterestBearingDepositsInBanks / us-gaap_CashAndCashEquivalentsAxis = func_MTFedFundsSoldMember	6,051us-gaap_InterestBearingDepositsInBanks / us-gaap_CashAndCashEquivalentsAxis = func_MTFedFundsSoldMember
Interest Rate	0.15%func_InterestRate / us-gaap_CashAndCashEquivalentsAxis = func_MTFedFundsSoldMember
CBB Fed Funds Sold [Member]
Cash and Cash Equivalents [Line Items]
Interest bearing deposits in banks	$ 0us-gaap_InterestBearingDepositsInBanks / us-gaap_CashAndCashEquivalentsAxis = func_CbbFedFundsSoldMember	$ 1,090us-gaap_InterestBearingDepositsInBanks / us-gaap_CashAndCashEquivalentsAxis = func_CbbFedFundsSoldMember
Interest Rate	0.22%func_InterestRate / us-gaap_CashAndCashEquivalentsAxis = func_CbbFedFundsSoldMember

X

- Definition

Percentage of interest income earned on a cash and cash equivalents account.

+ References

No definition available.

+ Details

Name:	func_InterestRate
Namespace Prefix:	func_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_CashAndCashEquivalentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.1)

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



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1, 2, 3

-Article 9

+ Details

Name:	us-gaap_CashAndDueFromBanks
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.

+ 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 210.9-03.2)

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



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6476743&loc=d3e59706-112781



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 2

-Article 9

+ Details

Name:	us-gaap_InterestBearingDepositsInBanks
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_CashAndCashEquivalentsAxis=func_CashAndDueFromBanksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CashAndCashEquivalentsAxis=func_CbbFedFundsSoldMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CashAndCashEquivalentsAxis=func_FhlbMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CashAndCashEquivalentsAxis=func_FtnMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CashAndCashEquivalentsAxis=func_MTFedFundsSoldMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: