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Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Fair Value Measurements
Collateral dependent loan fully reserved	$ 75,000	$ 0

X

- Definition

The amount pertaining to the collateral dependent loan that is fully reserved.

+ References

No definition available.

+ Details

Name:	ubcp_CollateralDependentLoanFullyReserved
Namespace Prefix:	ubcp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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