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Loans, Acquired Loans Acquired In Accordance With FASB 310-30 (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Jan. 24, 2014
Business Acquisition [Line Items]      
Interest component of expected cash flows (accretable discount) $ 2,491us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield $ 2,674us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield  
Eaton National Bank [Member]      
Business Acquisition [Line Items]      
Contractually required principal at acquisition     23,414us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition
/ us-gaap_BusinessAcquisitionAxis
= lcnb_EatonNationalBankMember
Contractual cash flows not expected to be collected (nonaccretable difference)     (6,088)us-gaap_CertainLoansAcquiredInTransferNonaccretableDifference
/ us-gaap_BusinessAcquisitionAxis
= lcnb_EatonNationalBankMember
Expected cash flows at acquisition     17,326us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition
/ us-gaap_BusinessAcquisitionAxis
= lcnb_EatonNationalBankMember
Interest component of expected cash flows (accretable discount)     (2,163)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield
/ us-gaap_BusinessAcquisitionAxis
= lcnb_EatonNationalBankMember
Fair value of acquired impaired loans     $ 15,163us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue
/ us-gaap_BusinessAcquisitionAxis
= lcnb_EatonNationalBankMember