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Contractual Obligations, Commitments and Contingent Liabilities (Schedule of Future Payable Contractual Obligations) (Details) $ in Thousands | Dec. 31, 2019 USD ($)
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Supply Commitment [Line Items] |
Less than 1 year | $ 166,329
1-3 years | 183,934
3-5 years | 31,390
After 5 years | 32,707
Contractual Obligation | 414,360
Short-Term Borrowings [Member] |
Supply Commitment [Line Items] |
Less than 1 year | 48,728
Contractual Obligation | 48,728
Long-Term Borrowings [Member] |
Supply Commitment [Line Items] |
1-3 years | 50,000
3-5 years | 20,000
After 5 years | 30,929
Contractual Obligation | 100,929
Certificates of Deposit [Member] |
Supply Commitment [Line Items] |
Less than 1 year | 114,234
1-3 years | 129,090
3-5 years | 10,566
Contractual Obligation | 253,890
Data Processing Obligations [Member] |
Supply Commitment [Line Items] |
Less than 1 year | 2,900
1-3 years | 3,867
Contractual Obligation | 6,767
Operating Lease Obligations [Member] |
Supply Commitment [Line Items] |
Less than 1 year | 467
1-3 years | 977
3-5 years | 824
After 5 years | 1,778
Contractual Obligation | $ 4,046

X
- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
Name: | us-gaap_ContractualObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueAfterFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation due in the fourth and fifth fiscal years following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInFourthAndFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInNextTwelveMonths
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation due in the second and third fiscal years following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInSecondAndThirdYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SupplyCommitmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SupplyCommitmentAxis=func_ShortTermBorrowingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SupplyCommitmentAxis=func_LongTermBorrowingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SupplyCommitmentAxis=us-gaap_CertificatesOfDepositMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SupplyCommitmentAxis=func_DataProcessingObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SupplyCommitmentAxis=func_OperatingLeaseObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |