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ACQUISITIONS, NARRATIVE (Details) (USD $)
0 Months Ended 12 Months Ended 0 Months Ended
Jan. 11, 2013
Dec. 31, 2014
Jan. 24, 2014
Dec. 29, 2014
Clarksburg, Ohio        
Business Acquisition [Line Items]        
Number of branches 1lcnb_NumberOfBranches
/ us-gaap_BusinessAcquisitionAxis
= lcnb_ClarksburgOhioMember
     
First Capital        
Business Acquisition [Line Items]        
Date of merger agreement   Oct. 09, 2012    
Total value of consideration paid $ 20,182,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= lcnb_FirstCapitalMember
     
Core deposit intangible amortization period (in years)   9 years    
Eaton National Bank        
Business Acquisition [Line Items]        
Date of merger agreement   Oct. 28, 2013    
Total value of consideration paid     24,750,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= lcnb_EatonNationalBankMember
 
Number of branches     5lcnb_NumberOfBranches
/ us-gaap_BusinessAcquisitionAxis
= lcnb_EatonNationalBankMember
 
Core deposit intangible amortization period (in years)   8 years    
BNB Bancorp, Inc.        
Business Acquisition [Line Items]        
Date of merger agreement   Dec. 29, 2014    
Total value of consideration paid       12,574,170us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= lcnb_BNBBancorpInc.Member
Shareholder cash entitlement (in dollars per share)   15.75lcnb_BusinessCombinationCashConsiderationPerShareAmount
/ us-gaap_BusinessAcquisitionAxis
= lcnb_BNBBancorpInc.Member
   
Exhange ratio per share   2.005lcnb_BusinessCombinationEquityInterestExchangeRatio
/ us-gaap_BusinessAcquisitionAxis
= lcnb_BNBBancorpInc.Member
   
Historic value of total assets acquired   108,800,000lcnb_BusinessCombinationHistoricFinancialInformationofAcquireeAssets
/ us-gaap_BusinessAcquisitionAxis
= lcnb_BNBBancorpInc.Member
   
Historical value of acquired net loans   36,400,000lcnb_BusinessCombinationHistoricFinancialInformationofAcquireeReceivables
/ us-gaap_BusinessAcquisitionAxis
= lcnb_BNBBancorpInc.Member
   
Historic value of acquired investments   58,300,000lcnb_BusinessCombinationHistoricFinancialInformationofAcquireeInvestments
/ us-gaap_BusinessAcquisitionAxis
= lcnb_BNBBancorpInc.Member
   
Historic value of assumed liabilities   98,200,000lcnb_BusinessCombinationHistoricFinancialInformationofAcquireeLiabilities
/ us-gaap_BusinessAcquisitionAxis
= lcnb_BNBBancorpInc.Member
   
Historic value of assumed deposits   97,900,000lcnb_BusinessCombinationHistoricFinancialInformationofAcquireeDeposits
/ us-gaap_BusinessAcquisitionAxis
= lcnb_BNBBancorpInc.Member
   
Citizens National Bank        
Business Acquisition [Line Items]        
Number of branches 6lcnb_NumberOfBranches
/ us-gaap_BusinessAcquisitionAxis
= lcnb_CitizensNationalBankMember
     
Chillicothe, Ohio        
Business Acquisition [Line Items]        
Number of branches 2lcnb_NumberOfBranches
/ us-gaap_BusinessAcquisitionAxis
= lcnb_ChillicotheOhioMember
     
Frankfort, Ohio        
Business Acquisition [Line Items]        
Number of branches 1lcnb_NumberOfBranches
/ us-gaap_BusinessAcquisitionAxis
= lcnb_FrankfortOhioMember
     
Washington Court House, Ohio        
Business Acquisition [Line Items]        
Number of branches 1lcnb_NumberOfBranches
/ us-gaap_BusinessAcquisitionAxis
= lcnb_WashingtonCourtHouseOhioMember
     
New Paris, Ohio        
Business Acquisition [Line Items]        
Number of branches     1lcnb_NumberOfBranches
/ us-gaap_BusinessAcquisitionAxis
= lcnb_NewParisOhioMember
 
Lewisburg, Ohio        
Business Acquisition [Line Items]        
Number of branches     1lcnb_NumberOfBranches
/ us-gaap_BusinessAcquisitionAxis
= lcnb_LewisburgOhioMember