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INVESTMENT SECURITIES, MATURITIES (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Available for Sale, Amortized Cost [Abstract]    
Due within one year $ 10,961us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Due from one to five years 133,901us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
Due from five to ten years 92,453us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost  
Due after ten years 4,560us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost  
Available-for-Sale, Amortized Cost 241,875us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis  
Amortized Cost 283,661us-gaap_AvailableForSaleSecuritiesAmortizedCost 260,728us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available-for-sale, Fair Value [Abstract]    
Due within one year 11,071us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Due from one to five years 134,894us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Due from five to ten years 92,493us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Due after ten years 4,615us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue  
Available-for-sale, at Fair Value 243,073us-gaap_AvailableForSaleSecuritiesDebtSecurities  
Available-for-sale, at fair value 285,365us-gaap_AvailableForSaleSecurities 258,241us-gaap_AvailableForSaleSecurities
Held-to-maturity Securities, Amortized Cost [Abstract]    
Due within one year 2,649us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount  
Due from one to five years 3,669us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount  
Due from five to ten years 4,175us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount  
Due after ten years 12,232us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount  
Amortized Cost 22,725us-gaap_HeldToMaturitySecurities 16,323us-gaap_HeldToMaturitySecurities
Held-to-maturity, Amortized Cost 22,725lcnb_HeldToMaturitySecuritiesAmortizedCost  
Held-to-maturity Securities, Fair Value [Abstract]    
Due within one year 2,661us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue  
Due from one to five years 3,665us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Due from five to ten years 4,063us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Due after ten years 11,749us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue  
Fair Value 22,138us-gaap_HeldToMaturitySecuritiesFairValue 16,196us-gaap_HeldToMaturitySecuritiesFairValue
U.S. Agency mortgage-backed securities    
Available for Sale, Amortized Cost [Abstract]    
Amortized Cost 37,838us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= lcnb_UsGovernmentAgencyMortgageBackedSecuritiesMember
 
Available-for-sale, Fair Value [Abstract]    
Available-for-sale, at fair value 38,032us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= lcnb_UsGovernmentAgencyMortgageBackedSecuritiesMember
 
Held-to-maturity Securities, Amortized Cost [Abstract]    
Held-to-maturity, Amortized Cost 0lcnb_HeldToMaturitySecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= lcnb_UsGovernmentAgencyMortgageBackedSecuritiesMember
 
Held-to-maturity Securities, Fair Value [Abstract]    
Fair Value 0us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= lcnb_UsGovernmentAgencyMortgageBackedSecuritiesMember
 
Mutual funds    
Available for Sale, Amortized Cost [Abstract]    
Amortized Cost 2,483us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= lcnb_MutualFundsMember
2,419us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= lcnb_MutualFundsMember
Available-for-sale, Fair Value [Abstract]    
Available-for-sale, at fair value 2,461us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= lcnb_MutualFundsMember
2,380us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= lcnb_MutualFundsMember
Held-to-maturity Securities, Amortized Cost [Abstract]    
Held-to-maturity, Amortized Cost 0lcnb_HeldToMaturitySecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= lcnb_MutualFundsMember
 
Held-to-maturity Securities, Fair Value [Abstract]    
Fair Value 0us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= lcnb_MutualFundsMember
 
Trust preferred securities    
Available for Sale, Amortized Cost [Abstract]    
Amortized Cost 50us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= lcnb_TrustPreferredSecuritiesMember
 
Available-for-sale, Fair Value [Abstract]    
Available-for-sale, at fair value 50us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= lcnb_TrustPreferredSecuritiesMember
 
Held-to-maturity Securities, Amortized Cost [Abstract]    
Held-to-maturity, Amortized Cost 0lcnb_HeldToMaturitySecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= lcnb_TrustPreferredSecuritiesMember
 
Held-to-maturity Securities, Fair Value [Abstract]    
Fair Value 0us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= lcnb_TrustPreferredSecuritiesMember
 
Equity securities    
Available for Sale, Amortized Cost [Abstract]    
Amortized Cost 1,415us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
1,429us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Available-for-sale, Fair Value [Abstract]    
Available-for-sale, at fair value 1,749us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
1,693us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Held-to-maturity Securities, Amortized Cost [Abstract]    
Held-to-maturity, Amortized Cost 0lcnb_HeldToMaturitySecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
 
Held-to-maturity Securities, Fair Value [Abstract]    
Fair Value $ 0us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember