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REGULATORY MATTERS, NARRATIVE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 1 Months Ended 12 Months Ended
Jul. 27, 2011
Nov. 30, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 09, 2009
Banking and Thrift [Abstract]            
Minimum cash reserve balance with Federal Reserve Bank     $ 11,766lcnb_MinimumAverageCashReserveBalanceWithFederalReserveBank $ 9,128lcnb_MinimumAverageCashReserveBalanceWithFederalReserveBank    
Cash Reserve balance     18,638us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations 11,730us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations    
Dividend payable from retained earnings without affecting capital position     4,073us-gaap_AmountAvailableForDividendDistributionWithoutAffectingCapitalAdequacyRequirements      
Issuance of common stock (in shares)   1,642,857us-gaap_StockIssuedDuringPeriodSharesNewIssues        
Proceeds from issuance of common stock   $ 26,900us-gaap_ProceedsFromIssuanceOfCommonStock $ 58us-gaap_ProceedsFromIssuanceOfCommonStock $ 26,950us-gaap_ProceedsFromIssuanceOfCommonStock $ 49us-gaap_ProceedsFromIssuanceOfCommonStock  
Shares available for issuance under Dividend Reinvestment and Stock Purchase Plan (in shares) 400,000lcnb_CommonStockSharesAuthorizedUnderDividendReinvestmentStockPurchasePlan          
Number of warrants outstanding     2us-gaap_ClassOfWarrantOrRightOutstanding      
Warrants to purchase common shares (in shares)     217,063us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights      
Warrants to purchase common shares exercise price (in dollars per share)     $ 9.26us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1      
Warrants to purchase common shares     10 years      
Warrants vested at grant           100.00%lcnb_WarrantsVestedAtGrantInHundredths