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Contractual Obligations, Commitments and Contingent Liabilities (Schedule of Future Payable Contractual Obligations) (Details) $ in Thousands | Dec. 31, 2020 USD ($)
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Supply Commitment [Line Items] |
Less than 1 year | $ 200,550
1-3 years | 101,524
3-5 years | 44,919
After 5 years | 56,406
Contractual Obligation | 403,399
Short-Term Borrowings [Member] |
Supply Commitment [Line Items] |
Less than 1 year | 49,160
Contractual Obligation | 49,160
Long-Term Borrowings [Member] |
Supply Commitment [Line Items] |
Less than 1 year | 5,000
1-3 years | 15,000
3-5 years | 30,000
After 5 years | 50,929
Contractual Obligation | 100,929
Certificates of Deposit [Member] |
Supply Commitment [Line Items] |
Less than 1 year | 142,767
1-3 years | 78,819
3-5 years | 6,598
After 5 years | 45
Contractual Obligation | 228,229
Data Processing Obligations [Member] |
Supply Commitment [Line Items] |
Less than 1 year | 3,128
1-3 years | 6,771
3-5 years | 7,513
After 5 years | 4,058
Contractual Obligation | 21,470
Operating Lease Obligations [Member] |
Supply Commitment [Line Items] |
Less than 1 year | 495
1-3 years | 934
3-5 years | 808
After 5 years | 1,374
Contractual Obligation | $ 3,611

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 to be paid after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + 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 to be paid in fourth and fifth fiscal years following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + 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 to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + 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 to be paid in second and third fiscal years following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + 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: |