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REGULATORY MATTERS (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Minimum Requirement        
Ratio of tier 1 capital to risk-weighted assets 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets    
Ratio of total capital (tier 1 capital plus tier 2 capital) to risk-weighted assets 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets    
Leverage ratio (tier 1 capital to adjusted quarterly average total assets) 3.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets 3.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets    
To Be Considered Well-Capitalized        
Ratio of tier 1 capital to risk-weighted assets 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets    
Ratio of total capital (tier 1 capital plus tier 2 capital) to risk-weighted assets 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets    
Leverage ratio (tier 1 capital to adjusted quarterly average total assets) 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets    
Regulatory Capital:        
Shareholders' Equity $ 125,695us-gaap_StockholdersEquity $ 118,873us-gaap_StockholdersEquity $ 82,006us-gaap_StockholdersEquity $ 77,960us-gaap_StockholdersEquity
Consolidated Company        
Regulatory Capital:        
Shareholders' Equity 125,695us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
118,873us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
   
Goodwill and other intangibles (31,886)lcnb_Tier1RiskedBasedCapitalGoodwillOtherIntangibles
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
(16,532)lcnb_Tier1RiskedBasedCapitalGoodwillOtherIntangibles
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
   
Accumulated other comprehensive income (785)lcnb_Tier1RiskedBasedCapitalAccumulatedOtherComprehensiveIncome
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
1,722lcnb_Tier1RiskedBasedCapitalAccumulatedOtherComprehensiveIncome
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
   
Tier 1 risk-based capital 93,024us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
104,063us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
   
Eligible allowance for loan losses 3,121us-gaap_TierTwoRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
3,588us-gaap_TierTwoRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
   
Total risk-based capital 96,145us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
107,651us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
   
Capital Ratios:        
Total risk-based 14.38%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
18.65%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
   
Tier 1 risk-based 13.92%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
18.03%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
   
Leverage 8.53%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
11.10%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidatedEntitiesMember
   
Bank        
Regulatory Capital:        
Shareholders' Equity 119,350us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
90,438us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Goodwill and other intangibles (31,886)lcnb_Tier1RiskedBasedCapitalGoodwillOtherIntangibles
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(16,532)lcnb_Tier1RiskedBasedCapitalGoodwillOtherIntangibles
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Accumulated other comprehensive income (583)lcnb_Tier1RiskedBasedCapitalAccumulatedOtherComprehensiveIncome
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,856lcnb_Tier1RiskedBasedCapitalAccumulatedOtherComprehensiveIncome
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Tier 1 risk-based capital 86,881us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
75,762us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Eligible allowance for loan losses 3,121us-gaap_TierTwoRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
3,588us-gaap_TierTwoRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Total risk-based capital $ 90,002us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
$ 79,350us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Capital Ratios:        
Total risk-based 13.50%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
13.81%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Tier 1 risk-based 13.03%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
13.18%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Leverage 7.98%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
8.10%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember