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BORROWINGS, FUNDS BORROWED FROM FHLB (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fixed Rate Advances, with monthly principal and interest payments    
Debt Instrument [Line Items]    
Long-term debt $ 11,357us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lcnb_FixedRateAdvancesWithMonthlyPrincipalAndInterestPaymentsMember		 $ 12,102us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lcnb_FixedRateAdvancesWithMonthlyPrincipalAndInterestPaymentsMember
Fixed Rate Advances, Due January 2015 | Fixed Rate Advances, due at maturity    
Debt Instrument [Line Items]    
Interest rate, period end 2.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= lcnb_FixedRateAdvancesDueAtMaturityMember
/ us-gaap_LongtermDebtTypeAxis
= lcnb_FederalHomeLoanBankFixedRateAdvanceDueJanuary2015Member		  
Long-term debt 5,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lcnb_FixedRateAdvancesDueAtMaturityMember
/ us-gaap_LongtermDebtTypeAxis
= lcnb_FederalHomeLoanBankFixedRateAdvanceDueJanuary2015Member		 5,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lcnb_FixedRateAdvancesDueAtMaturityMember
/ us-gaap_LongtermDebtTypeAxis
= lcnb_FederalHomeLoanBankFixedRateAdvanceDueJanuary2015Member
Fixed Rate Advances, Due March 2017 | Fixed Rate Advances, due at maturity    
Debt Instrument [Line Items]    
Interest rate, period end 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= lcnb_FixedRateAdvancesDueAtMaturityMember
/ us-gaap_LongtermDebtTypeAxis
= lcnb_FederalHomeLoanBankAdvanceDueMarch2017Member		  
Long-term debt 5,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lcnb_FixedRateAdvancesDueAtMaturityMember
/ us-gaap_LongtermDebtTypeAxis
= lcnb_FederalHomeLoanBankAdvanceDueMarch2017Member		 5,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lcnb_FixedRateAdvancesDueAtMaturityMember
/ us-gaap_LongtermDebtTypeAxis
= lcnb_FederalHomeLoanBankAdvanceDueMarch2017Member
Fixed Rate Advances, Due March 2014 | Fixed Rate Advances, with monthly principal and interest payments    
Debt Instrument [Line Items]    
Interest rate, period end 2.45%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= lcnb_FixedRateAdvancesWithMonthlyPrincipalAndInterestPaymentsMember
/ us-gaap_LongtermDebtTypeAxis
= lcnb_FederalHomeLoanBankAdvanceDueMarch2014Member		  
Long-term debt 0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lcnb_FixedRateAdvancesWithMonthlyPrincipalAndInterestPaymentsMember
/ us-gaap_LongtermDebtTypeAxis
= lcnb_FederalHomeLoanBankAdvanceDueMarch2014Member		 265us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lcnb_FixedRateAdvancesWithMonthlyPrincipalAndInterestPaymentsMember
/ us-gaap_LongtermDebtTypeAxis
= lcnb_FederalHomeLoanBankAdvanceDueMarch2014Member
Fixed Rate Advances, Due March 2019 | Fixed Rate Advances, with monthly principal and interest payments    
Debt Instrument [Line Items]    
Interest rate, period end 2.82%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= lcnb_FixedRateAdvancesWithMonthlyPrincipalAndInterestPaymentsMember
/ us-gaap_LongtermDebtTypeAxis
= lcnb_FederalHomeLoanBankAdvanceDueMarch2019Member		  
Long-term debt $ 1,357us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lcnb_FixedRateAdvancesWithMonthlyPrincipalAndInterestPaymentsMember
/ us-gaap_LongtermDebtTypeAxis
= lcnb_FederalHomeLoanBankAdvanceDueMarch2019Member		 $ 1,837us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= lcnb_FixedRateAdvancesWithMonthlyPrincipalAndInterestPaymentsMember
/ us-gaap_LongtermDebtTypeAxis
= lcnb_FederalHomeLoanBankAdvanceDueMarch2019Member