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v3.25.1

Fair Value Measurements (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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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