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Loans and Related Allowance for Loan Losses (Modification of Troubled Debt Restructuring by Class) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) contract	Sep. 30, 2018 USD ($) contract	Sep. 30, 2019 USD ($) contract	Sep. 30, 2018 USD ($) contract
Temporary Rate Modification [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	1		1
Recorded Investment | $	$ 149		$ 149
Temporary Rate Modification [Member] | Residential mortgage- term [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	1		1
Recorded Investment | $	$ 149		$ 149
Extended Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract		1		2
Recorded Investment | $		$ 387		$ 566
Extended Maturity [Member] | Commercial real estate- all other CRE [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract				1
Recorded Investment | $				$ 179
Extended Maturity [Member] | Acquisition and development- 1-4 family residential construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract		1		1
Recorded Investment | $		$ 387		$ 387
Modification Of Payment And Other Terms [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract			2	1
Recorded Investment | $			$ 470	$ 126
Modification Of Payment And Other Terms [Member] | Commercial real estate- non owner-occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract				1
Recorded Investment | $				$ 126
Modification Of Payment And Other Terms [Member] | Acquisition and development- All other A&D [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract			1
Recorded Investment | $			$ 227
Modification Of Payment And Other Terms [Member] | Residential mortgage- term [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract			1
Recorded Investment | $			$ 243

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	func_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	func_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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