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ACQUISITIONS, NARRATIVE (Details) (USD $) | 0 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | ---
Jan. 11, 2013 | Dec. 31, 2014 | Jan. 24, 2014 | Dec. 29, 2014
Clarksburg, Ohio |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches | 1 lcnb_NumberOfBranches / us-gaap_BusinessAcquisitionAxis = lcnb_ClarksburgOhioMember |  |  |
First Capital |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Date of merger agreement |  | Oct. 09, 2012 |  |
Total value of consideration paid | $ 20,182,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = lcnb_FirstCapitalMember |  |  |
Core deposit intangible amortization period (in years) |  | 9 years |  |
Eaton National Bank |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Date of merger agreement |  | Oct. 28, 2013 |  |
Total value of consideration paid |  |  | 24,750,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = lcnb_EatonNationalBankMember |
Number of branches |  |  | 5 lcnb_NumberOfBranches / us-gaap_BusinessAcquisitionAxis = lcnb_EatonNationalBankMember |
Core deposit intangible amortization period (in years) |  | 8 years |  |
BNB Bancorp, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Date of merger agreement |  | Dec. 29, 2014 |  |
Total value of consideration paid |  |  |  | 12,574,170 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = lcnb_BNBBancorpInc.Member
Shareholder cash entitlement (in dollars per share) |  | 15.75 lcnb_BusinessCombinationCashConsiderationPerShareAmount / us-gaap_BusinessAcquisitionAxis = lcnb_BNBBancorpInc.Member |  |
Exhange ratio per share |  | 2.005 lcnb_BusinessCombinationEquityInterestExchangeRatio / us-gaap_BusinessAcquisitionAxis = lcnb_BNBBancorpInc.Member |  |
Historic value of total assets acquired |  | 108,800,000 lcnb_BusinessCombinationHistoricFinancialInformationofAcquireeAssets / us-gaap_BusinessAcquisitionAxis = lcnb_BNBBancorpInc.Member |  |
Historical value of acquired net loans |  | 36,400,000 lcnb_BusinessCombinationHistoricFinancialInformationofAcquireeReceivables / us-gaap_BusinessAcquisitionAxis = lcnb_BNBBancorpInc.Member |  |
Historic value of acquired investments |  | 58,300,000 lcnb_BusinessCombinationHistoricFinancialInformationofAcquireeInvestments / us-gaap_BusinessAcquisitionAxis = lcnb_BNBBancorpInc.Member |  |
Historic value of assumed liabilities |  | 98,200,000 lcnb_BusinessCombinationHistoricFinancialInformationofAcquireeLiabilities / us-gaap_BusinessAcquisitionAxis = lcnb_BNBBancorpInc.Member |  |
Historic value of assumed deposits |  | 97,900,000 lcnb_BusinessCombinationHistoricFinancialInformationofAcquireeDeposits / us-gaap_BusinessAcquisitionAxis = lcnb_BNBBancorpInc.Member |  |
Citizens National Bank |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches | 6 lcnb_NumberOfBranches / us-gaap_BusinessAcquisitionAxis = lcnb_CitizensNationalBankMember |  |  |
Chillicothe, Ohio |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches | 2 lcnb_NumberOfBranches / us-gaap_BusinessAcquisitionAxis = lcnb_ChillicotheOhioMember |  |  |
Frankfort, Ohio |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches | 1 lcnb_NumberOfBranches / us-gaap_BusinessAcquisitionAxis = lcnb_FrankfortOhioMember |  |  |
Washington Court House, Ohio |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches | 1 lcnb_NumberOfBranches / us-gaap_BusinessAcquisitionAxis = lcnb_WashingtonCourtHouseOhioMember |  |  |
New Paris, Ohio |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches |  |  | 1 lcnb_NumberOfBranches / us-gaap_BusinessAcquisitionAxis = lcnb_NewParisOhioMember |
Lewisburg, Ohio |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches |  |  | 1 lcnb_NumberOfBranches / us-gaap_BusinessAcquisitionAxis = lcnb_LewisburgOhioMember |

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