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Fair Value of Financial Instruments (Fair Value by Balance Sheet Grouping) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	$ 38,584	$ 22,187
Interest bearing deposits in banks	405	1,354
Investment securities - AFS	135,809	137,641
Investment securities - HTM	102,503	93,760
Restricted bank stock	4,415	5,394
Loans, net	976,051	967,198
Financial derivatives		1,043
Accrued interest receivable	4,083	4,175
Deposits - non-maturity	861,832	815,858
Deposits - time deposits	262,533	252,146
Financial derivatives	55
Short-term borrowed funds	31,155	77,707
Long-term borrowed funds	103,214	102,590
Accrued interest payable	503	455
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	38,584	22,187
Interest bearing deposits in banks	405	1,354
Investment securities - AFS	135,809	137,641
Investment securities - HTM	97,499	94,010
Restricted bank stock	4,415	5,394
Loans, net	991,640	996,667
Financial derivatives		1,043
Accrued interest receivable	4,083	4,175
Deposits - non-maturity	861,832	815,858
Deposits - time deposits	261,249	251,669
Financial derivatives	55
Short-term borrowed funds	31,155	77,707
Long-term borrowed funds	100,929	100,929
Accrued interest payable	503	455
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	38,584	22,187
Interest bearing deposits in banks	405	1,354
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities - AFS	120,937	122,364
Investment securities - HTM	83,609	80,780
Restricted bank stock	4,415	5,394
Financial derivatives		1,043
Accrued interest receivable	4,083	4,175
Deposits - non-maturity	861,832	815,858
Deposits - time deposits	262,533	252,146
Financial derivatives	55
Short-term borrowed funds	31,155	77,707
Long-term borrowed funds	103,214	102,590
Accrued interest payable	503	455
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities - AFS	14,872	15,277
Investment securities - HTM	18,894	12,980
Loans, net	$ 976,051	$ 967,198

X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. Includes disclosure of claims held for interest amounts due a company.

+ References

No definition available.

+ Details

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Namespace Prefix:	func_
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X

- Definition

For banks and other depository institutions (including Federal Reserve Banks, if applicable): The fair value of Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits.

+ References

No definition available.

+ Details

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X

- Definition

Investment Securities, Available For Sale, Fair Value

+ References

No definition available.

+ Details

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Namespace Prefix:	func_
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X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. Includes deposit liabilities having no set maturity (excluding time deposits)

+ References

No definition available.

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- Definition

Information on investments in correspondent bank stock

+ References

No definition available.

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X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure. This item represents the aggregate of all time deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing.

+ References

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- Definition

Fair value portion of accrued expenses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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- 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.

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No definition available.

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- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563

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- Definition

Fair value as of the balance sheet date of all interest rate derivative assets designated as cash flow hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
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- Definition

Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959

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- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196772

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.

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