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COMMITMENTS AND CONTINGENT LIABILITIES (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet risks, liability $ 93,286us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability $ 85,320us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
Commitments outstanding for capital expenditures 112us-gaap_OtherCommitment  
Commercial loans    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet risks, liability 5,152us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 9,316us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Other loans | Fixed rate    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet risks, liability 877us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= lcnb_OtherLoansMember
/ lcnb_InterestTypeAxis
= lcnb_FixedRateMember		 852us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= lcnb_OtherLoansMember
/ lcnb_InterestTypeAxis
= lcnb_FixedRateMember
Other loans | Adjustable rate    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet risks, liability 2,011us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= lcnb_OtherLoansMember
/ lcnb_InterestTypeAxis
= lcnb_AdjustableRateMember		 1,653us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= lcnb_OtherLoansMember
/ lcnb_InterestTypeAxis
= lcnb_AdjustableRateMember
Unused lines of credit | Fixed rate    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet risks, liability 6,496us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_UnusedLinesOfCreditMember
/ lcnb_InterestTypeAxis
= lcnb_FixedRateMember		 3,404us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_UnusedLinesOfCreditMember
/ lcnb_InterestTypeAxis
= lcnb_FixedRateMember
Unused lines of credit | Adjustable rate    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet risks, liability 67,981us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_UnusedLinesOfCreditMember
/ lcnb_InterestTypeAxis
= lcnb_AdjustableRateMember		 60,236us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_UnusedLinesOfCreditMember
/ lcnb_InterestTypeAxis
= lcnb_AdjustableRateMember
Unused overdraft protection amounts on demand and NOW accounts    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet risks, liability 10,206us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= lcnb_UnusedOverdraftProtectionAmountsOnDemandAndNowAccountsMember		 9,494us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= lcnb_UnusedOverdraftProtectionAmountsOnDemandAndNowAccountsMember
Standby letters of credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet risks, liability $ 563us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_StandbyLettersOfCreditMember		 $ 365us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_StandbyLettersOfCreditMember