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Contractual Obligations, Commitments and Contingent Liabilities (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Supply Commitment [Line Items]
Less than 1 year	$ 197,675
1-3 years	179,653
3-5 years	37,688
After 5 years	32,492
Contractual Obligation	447,508
Short-Term Borrowings [Member]
Supply Commitment [Line Items]
Less than 1 year	77,707
1-3 years	0
3-5 years	0
After 5 years	0
Contractual Obligation	77,707
Long-Term Borrowings [Member]
Supply Commitment [Line Items]
Less than 1 year	20,000
1-3 years	50,000
3-5 years	0
After 5 years	30,929
Contractual Obligation	100,929
Certificates of Deposit [Member]
Supply Commitment [Line Items]
Less than 1 year	96,758
1-3 years	123,377
3-5 years	31,534
After 5 years	0
Contractual Obligation	251,669
Data Processing Obligations [Member]
Supply Commitment [Line Items]
Less than 1 year	2,700
1-3 years	5,400
3-5 years	5,400
After 5 years	0
Contractual Obligation	13,500
Operating Lease Obligations [Member]
Supply Commitment [Line Items]
Less than 1 year	510
1-3 years	876
3-5 years	754
After 5 years	1,563
Contractual Obligation	$ 3,703

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

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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: