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RETIREMENT PLANS, NARRATIVE (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jul. 01, 2014
Jul. 01, 2013
Feb. 01, 2009
age_and_service
Defined Contribution Plan [Abstract]            
Age plus vesting service (less than, in years)           65lcnb_DeferredCompensationArrangementwithIndividualMaximumVestingServicePlusAgeofEmployeetoReceivePayments
Employer's matching contribution to 401(k) of employees hired on or after January 1, 2009 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent          
Maximum annual contribution per employee, percent 3.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent          
Automatic Annual Contribution Employees Hired After January 1, 2009 Benefit Reduction Under Certain Amendments Minimum 5.00%lcnb_AutomaticAnnualContributionEmployeesHiredAfterJanuary12009BenefitReductionUnderCertainAmendmentsMinimum          
Automatic Annual Contribution Employees Hired After January 1, 2009 Due Benefit Reduction Under Certain Amendments Maximum 7.00%lcnb_AutomaticAnnualContributionEmployeesHiredAfterJanuary12009DueBenefitReductionUnderCertainAmendmentsMaximum          
Defined benefit plan, funded percentage       80.00%us-gaap_DefinedBenefitPlanFundedPercentage 80.00%us-gaap_DefinedBenefitPlanFundedPercentage  
Employer expected contribution to 401 (k) plan in next fiscal year $ 335lcnb_DefinedContributionPlanEmployerExpectedContributionAmount          
Deferred Compensation Arrangements            
Deferred Compensation Arrangements [Abstract]            
Accrued interest on deferred compensation 8.00%lcnb_DeferredCompensationPlanAccruedInterestPercentage
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Deferred compensation liability 3,012us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent
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2,732us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent
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Supplemental Employee Retirement Plan            
Supplemental income plan [Abstract]            
Projected benefit obligation 1,106us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation
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1,040us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation
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Discount rate 5.30%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
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5.30%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
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Service cost 43us-gaap_DefinedBenefitPlanServiceCost
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111us-gaap_DefinedBenefitPlanServiceCost
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20us-gaap_DefinedBenefitPlanServiceCost
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Interest cost 56us-gaap_DefinedBenefitPlanInterestCost
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47us-gaap_DefinedBenefitPlanInterestCost
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20us-gaap_DefinedBenefitPlanInterestCost
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Qualified noncontributory defined benefit retirement plan            
Defined Contribution Plan [Abstract]            
Expected contribution by employer to noncontributory defined benefit plan 158lcnb_QualifiedPensionPlanExpectedContributionByEmployer
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Nonqualified defined benefit retirement plan            
Supplemental income plan [Abstract]            
Discount rate 3.95%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
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4.95%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
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4.05%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
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Service cost 68us-gaap_DefinedBenefitPlanServiceCost
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71us-gaap_DefinedBenefitPlanServiceCost
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89us-gaap_DefinedBenefitPlanServiceCost
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Interest cost 60us-gaap_DefinedBenefitPlanInterestCost
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46us-gaap_DefinedBenefitPlanInterestCost
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43us-gaap_DefinedBenefitPlanInterestCost
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Recognized in other liabilities nonqualified defined benefit retirement plan 1,741us-gaap_DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities
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1,213us-gaap_DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities
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Accumulated benefit obligation under nonqualified defined benefit retirement plan 1,633us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
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1,022us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
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Future amortization of prior service cost 172us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss
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Citizens National Bank            
Defined Contribution Plan [Abstract]            
Qualified noncontributory defined benefit pension plan liability $ 31lcnb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDefinedBenefitPensionPlan
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