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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
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Cash and Cash Equivalents [Line Items] |  |
Cash and due from banks | $ 27,554 us-gaap_CashAndDueFromBanks | $ 32,895 us-gaap_CashAndDueFromBanks
Interest bearing deposits in banks | 7,897 us-gaap_InterestBearingDepositsInBanks | 10,168 us-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 | 983 us-gaap_InterestBearingDepositsInBanks / us-gaap_CashAndCashEquivalentsAxis = func_FhlbMember | 1,677 us-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 | 850 us-gaap_InterestBearingDepositsInBanks / us-gaap_CashAndCashEquivalentsAxis = func_FtnMember | 1,350 us-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 | 6,064 us-gaap_InterestBearingDepositsInBanks / us-gaap_CashAndCashEquivalentsAxis = func_MTFedFundsSoldMember | 6,051 us-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 | $ 0 us-gaap_InterestBearingDepositsInBanks / us-gaap_CashAndCashEquivalentsAxis = func_CbbFedFundsSoldMember | $ 1,090 us-gaap_InterestBearingDepositsInBanks / us-gaap_CashAndCashEquivalentsAxis = func_CbbFedFundsSoldMember
Interest Rate | 0.22%func_InterestRate / us-gaap_CashAndCashEquivalentsAxis = func_CbbFedFundsSoldMember |

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- 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

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

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- 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

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

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

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- Details
Name: | us-gaap_CashAndCashEquivalentsAxis=func_CbbFedFundsSoldMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CashAndCashEquivalentsAxis=func_FhlbMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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