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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Accumulated Other Comprehensive Income |  |
Net unrealized (loss) gain on securities available-for-sale | $ (10,984) | $ 10,943
Net unrealized loss for unfunded status of defined benefit plan liability | (835) | (2,127)
Accumulated other comprehensive income (loss), before taxes, total | (11,819) | 8,816
Tax effect | 2,483 | (1,852)
Net-of-tax amount | $ (9,336) | $ 6,964

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- Definition The amount of accumulated other comprehensive income (loss), before taxes. + References No definition available. + Details
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Namespace Prefix: | ubcp_
Data Type: | xbrli:monetaryItemType
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- Definition The amount of accumulated other comprehensive income (loss), defined benefit plan net transition assets obligation, before tax. + References No definition available. + Details
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- Definition The amount of accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, before tax cuts and job act. + References No definition available. + Details
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- Definition The amount of accumulated other comprehensive income (loss), tax. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The amount of accumulated other comprehensive income (loss), unrealized gains (losses) on available for sale securities, before tax. + References No definition available. + Details
Name: | ubcp_AccumulatedOtherComprehensiveIncomeLossUnrealizedGainsLossesOnAvailableForSaleSecuritiesBeforeTax
Namespace Prefix: | ubcp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Other Comprehensive Income (Loss) [Line Items] + References No definition available. + Details
Name: | ubcp_OtherComprehensiveIncomeLossLineItems
Namespace Prefix: | ubcp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration