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

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

No definition available.

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