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ACCUMULATED OTHER COMPREHENSIVE INCOME, RECLASSIFICATION OF AOCI (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Realized gain on sales of securities                 $ 149us-gaap_GainLossOnSaleOfSecuritiesNet $ 1,060us-gaap_GainLossOnSaleOfSecuritiesNet $ 1,853us-gaap_GainLossOnSaleOfSecuritiesNet
Less provision for income taxes 1,228us-gaap_IncomeTaxExpenseBenefit 953us-gaap_IncomeTaxExpenseBenefit 841us-gaap_IncomeTaxExpenseBenefit 364us-gaap_IncomeTaxExpenseBenefit 797us-gaap_IncomeTaxExpenseBenefit 804us-gaap_IncomeTaxExpenseBenefit 824us-gaap_IncomeTaxExpenseBenefit 517us-gaap_IncomeTaxExpenseBenefit 3,386us-gaap_IncomeTaxExpenseBenefit 2,942us-gaap_IncomeTaxExpenseBenefit 2,795us-gaap_IncomeTaxExpenseBenefit
Unrealized Gains and Losses on Available-for-Sale Securities | Reclassification out of Accumulated Other Comprehensive Income                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Realized gain on sales of securities                 149us-gaap_GainLossOnSaleOfSecuritiesNet
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1,060us-gaap_GainLossOnSaleOfSecuritiesNet
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Adjustment for change in unrealized gain between sale date and previous quarter-end                 0lcnb_AdjustmentforChangeinUnrealizedGainbetweenSaleDateandPreviousQuarterEnd
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168lcnb_AdjustmentforChangeinUnrealizedGainbetweenSaleDateandPreviousQuarterEnd
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Income (loss) from continuing operations                 149lcnb_IncomeLossfromContinuingOperationsandAdjustmentforChangeinUnrealizedGain
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1,228lcnb_IncomeLossfromContinuingOperationsandAdjustmentforChangeinUnrealizedGain
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Less provision for income taxes                 51us-gaap_IncomeTaxExpenseBenefit
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418us-gaap_IncomeTaxExpenseBenefit
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Reclassification adjustment, net of taxes                 $ 98us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
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$ 810us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
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