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LOANS, TROUBLED DEBT RESTRUCTURING AND MORTGAGE SERVICING RIGHTS (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 3 Months Ended
Dec. 31, 2014
Loan
Dec. 31, 2013
Loan
Dec. 31, 2012
Mar. 31, 2013
Loan modifications classified as troubled debt restructurings [Abstract]        
Number of Loans 15us-gaap_FinancingReceivableModificationsNumberOfContracts2 12us-gaap_FinancingReceivableModificationsNumberOfContracts2    
Pre-Modification Recorded Balance $ 1,676us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 $ 2,151us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2    
Post-Modification Recorded Balance 1,676us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 2,151us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2    
Modified impaired loans without a valuation allowance 1,329lcnb_FinancingReceivableModificationswithNoRelatedAllowanceRecordedInvestment 327lcnb_FinancingReceivableModificationswithNoRelatedAllowanceRecordedInvestment    
Modified impaired loans with valuation allowance 299lcnb_FinancingReceivableModificationswithRelatedAllowanceRecordedInvestment 1,141lcnb_FinancingReceivableModificationswithRelatedAllowanceRecordedInvestment    
Servicing Asset at Amortized Cost, Balance [Roll Forward]        
Balance, beginning of year 498us-gaap_ServicingAssetAtAmortizedValue 475us-gaap_ServicingAssetAtAmortizedValue 418us-gaap_ServicingAssetAtAmortizedValue 475us-gaap_ServicingAssetAtAmortizedValue
Amount capitalized to mortgage servicing rights 292us-gaap_ServicingAssetAtAmortizedValueAdditions 191us-gaap_ServicingAssetAtAmortizedValueAdditions 283us-gaap_ServicingAssetAtAmortizedValueAdditions  
Amortization of mortgage servicing rights (199)us-gaap_AmortizationOfMortgageServicingRightsMSRs (168)us-gaap_AmortizationOfMortgageServicingRightsMSRs (226)us-gaap_AmortizationOfMortgageServicingRightsMSRs  
Balance, end of year 591us-gaap_ServicingAssetAtAmortizedValue 498us-gaap_ServicingAssetAtAmortizedValue 475us-gaap_ServicingAssetAtAmortizedValue  
Federal Home Loan Mortgage Corporation and Other Investors [Member]        
Loan modifications classified as troubled debt restructurings [Abstract]        
Unpaid principal balances of loans sold and serviced for the Federal Home Loan Mortgage Corporation 120,433lcnb_UnpaidPrincipalBalanceOfLoansServicedForOthers
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lcnb_FederalHomeLoanMortgageCorporationAndOtherInvestorsMember
90,343lcnb_UnpaidPrincipalBalanceOfLoansServicedForOthers
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lcnb_FederalHomeLoanMortgageCorporationAndOtherInvestorsMember
71,568lcnb_UnpaidPrincipalBalanceOfLoansServicedForOthers
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lcnb_FederalHomeLoanMortgageCorporationAndOtherInvestorsMember
 
Commercial & industrial        
Loan modifications classified as troubled debt restructurings [Abstract]        
Number of Loans 8us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= lcnb_CommercialAndIndustrialMember
1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= lcnb_CommercialAndIndustrialMember
   
Pre-Modification Recorded Balance 658us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= lcnb_CommercialAndIndustrialMember
22us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= lcnb_CommercialAndIndustrialMember
   
Post-Modification Recorded Balance 340us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= lcnb_CommercialAndIndustrialMember
22us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= lcnb_CommercialAndIndustrialMember
   
Commercial, secured by real estate        
Loan modifications classified as troubled debt restructurings [Abstract]        
Number of Loans 2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
3us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
   
Pre-Modification Recorded Balance 896us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
1,594us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
   
Post-Modification Recorded Balance 1,214us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
1,594us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
   
Residential real estate        
Loan modifications classified as troubled debt restructurings [Abstract]        
Number of Loans 2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialPortfolioSegmentMember
6us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialPortfolioSegmentMember
   
Pre-Modification Recorded Balance 82us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialPortfolioSegmentMember
508us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialPortfolioSegmentMember
   
Post-Modification Recorded Balance 82us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialPortfolioSegmentMember
508us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialPortfolioSegmentMember
   
Consumer        
Loan modifications classified as troubled debt restructurings [Abstract]        
Number of Loans 3us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember
2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember
   
Pre-Modification Recorded Balance 40us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember
27us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember
   
Post-Modification Recorded Balance 40us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember
27us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember
   
Auto loan        
Loan modifications classified as troubled debt restructurings [Abstract]        
Restructured automobile loan charged off       $ 13us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember