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Recent Accounting Pronouncements (Details) - Accounting Standards Update 2016-02 - Forecast $ in Millions | Dec. 31, 2018 USD ($)
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Right of use asset | $ 5
Lease liabilities | $ 5

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References No definition available. + Details
Name: | lcnb_FinanceLeaseLiability
Namespace Prefix: | lcnb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of lessee's right to use underlying asset under finance lease. + References No definition available. + Details
Name: | lcnb_FinanceLeaseRightOfUseAsset
Namespace Prefix: | lcnb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=lcnb_AccountingStandardsUpdate201602Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |