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LOANS, ACQUIRED LOANS ACQUIRED IN ACCORDANCE WITH FASB 310-30 (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 24, 2014
Business Acquisition [Line Items]        
Interest component of expected cash flows (accretable discount) $ (2,674)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield $ (1,107)us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield $ 0us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretableYield  
Eaton National Bank        
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