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BORROWINGS, NARRATIVE (Details) (USD $)
12 Months Ended
Dec. 31, 2014
institution
Dec. 31, 2013
Debt Disclosure [Abstract]    
Pledged financial instruments for Federal Home Loan Bank $ 212,000,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForFederalHomeLoanBank $ 183,000,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForFederalHomeLoanBank
FHLB remaining borrowing capacity 100,800,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds  
Number of financial institution 3lcnb_Short-TermBorrowingArrangementsFromNumberOfFinancialInstitution  
First arrangement short term borrowings 7,000,000lcnb_MaximumShortTermBorrowingsRelatedToFirstArrangement  
Second arrangement short term borrowings 10,000,000lcnb_MaximumShortTermBorrowingsRelatedToSecondArrangement  
Third arrangement short term borrowings 20,000,000lcnb_MaximumShortTermBorrowingsRelatedToThirdArrangement  
Variable rate basis federal funds rate  
Basis point spread 50.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1  
Short-term advances under Cash Management Advance program 46,500,000.0lcnb_ShortTermAdvancesMaximumBorrowingCapacityUnderCashManagementAdvanceProgram  
Variable rate interest rate terms 90 days  
Fixed interest rate terms 30 days  
Expiration date for Cash Management Advance program Aug. 28, 2015  
Maximum short-term borrowing at month end 12,927,000us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount 15,165,000us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount
Short-term borrowing average balances 11,367,000us-gaap_ShorttermDebtAverageOutstandingAmount 11,376,000us-gaap_ShorttermDebtAverageOutstandingAmount
Short term borrowing held by member of board of director $ 1,200,000lcnb_ShortTermBorrowingHeldByRelatedParty $ 700,000lcnb_ShortTermBorrowingHeldByRelatedParty