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Deposits - Narrative (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Interest-Bearing Deposits |  |
Time deposits greater than $250,000 | $ 32,700 | $ 16,100

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- Definition Time Deposits, $250,000 or More + References No definition available. + Details
Name: | lcnb_TimeDeposits250000OrMore
Namespace Prefix: | lcnb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_InterestBearingDepositsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |