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Loans and Allowance for Credit Losses - Schedule of Troubled Debt Restructurings on Financing Receivables (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($)
Commercial and Industrial
Loans and Allowance for Loan Losses
Interest Only	$ 0
Term	0
Combination	0
Total Modification	0
Commercial Real Estate
Loans and Allowance for Loan Losses
Interest Only	1
Term	1
Total Modification	$ 1

X

- Definition

The amount represents the financing receivable modification combination.

+ References

No definition available.

+ Details

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

X

- Definition

The amount represents the finance receivable from modifications interests.

+ References

No definition available.

+ Details

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

X

- Definition

The amount represents the finance receivable modifications term.

+ References

No definition available.

+ Details

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

X

- Definition

The total amount of modifications made to financing receivables.

+ References

No definition available.

+ Details

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Namespace Prefix:	ubcp_
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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
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-Name Accounting Standards Codification
-Section 55
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481933/310-10-55-12A

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 33
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-33

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 34
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-34

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: