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LOANS, TROUBLED DEBT RESTRUCTURING AND MORTGAGE SERVICING RIGHTS (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2014 Loan | Dec. 31, 2013 Loan | Dec. 31, 2012 | Mar. 31, 2013
Loan modifications classified as troubled debt restructurings [Abstract] |  |  |  |
Number of Loans | 15 us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 12 us-gaap_FinancingReceivableModificationsNumberOfContracts2 |  |
Pre-Modification Recorded Balance | $ 1,676 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 | $ 2,151 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 |  |
Post-Modification Recorded Balance | 1,676 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 | 2,151 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 |  |
Modified impaired loans without a valuation allowance | 1,329 lcnb_FinancingReceivableModificationswithNoRelatedAllowanceRecordedInvestment | 327 lcnb_FinancingReceivableModificationswithNoRelatedAllowanceRecordedInvestment |  |
Modified impaired loans with valuation allowance | 299 lcnb_FinancingReceivableModificationswithRelatedAllowanceRecordedInvestment | 1,141 lcnb_FinancingReceivableModificationswithRelatedAllowanceRecordedInvestment |  |
Servicing Asset at Amortized Cost, Balance [Roll Forward] |  |  |  |
Balance, beginning of year | 498 us-gaap_ServicingAssetAtAmortizedValue | 475 us-gaap_ServicingAssetAtAmortizedValue | 418 us-gaap_ServicingAssetAtAmortizedValue | 475 us-gaap_ServicingAssetAtAmortizedValue
Amount capitalized to mortgage servicing rights | 292 us-gaap_ServicingAssetAtAmortizedValueAdditions | 191 us-gaap_ServicingAssetAtAmortizedValueAdditions | 283 us-gaap_ServicingAssetAtAmortizedValueAdditions |
Amortization of mortgage servicing rights | (199)us-gaap_AmortizationOfMortgageServicingRightsMSRs | (168)us-gaap_AmortizationOfMortgageServicingRightsMSRs | (226)us-gaap_AmortizationOfMortgageServicingRightsMSRs |
Balance, end of year | 591 us-gaap_ServicingAssetAtAmortizedValue | 498 us-gaap_ServicingAssetAtAmortizedValue | 475 us-gaap_ServicingAssetAtAmortizedValue |
Federal Home Loan Mortgage Corporation and Other Investors [Member] |  |  |  |
Loan modifications classified as troubled debt restructurings [Abstract] |  |  |  |
Unpaid principal balances of loans sold and serviced for the Federal Home Loan Mortgage Corporation | 120,433 lcnb_UnpaidPrincipalBalanceOfLoansServicedForOthers / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = lcnb_FederalHomeLoanMortgageCorporationAndOtherInvestorsMember | 90,343 lcnb_UnpaidPrincipalBalanceOfLoansServicedForOthers / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = lcnb_FederalHomeLoanMortgageCorporationAndOtherInvestorsMember | 71,568 lcnb_UnpaidPrincipalBalanceOfLoansServicedForOthers / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = lcnb_FederalHomeLoanMortgageCorporationAndOtherInvestorsMember |
Commercial & industrial |  |  |  |
Loan modifications classified as troubled debt restructurings [Abstract] |  |  |  |
Number of Loans | 8 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = lcnb_CommercialAndIndustrialMember | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = lcnb_CommercialAndIndustrialMember |  |
Pre-Modification Recorded Balance | 658 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = lcnb_CommercialAndIndustrialMember | 22 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = lcnb_CommercialAndIndustrialMember |  |
Post-Modification Recorded Balance | 340 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = lcnb_CommercialAndIndustrialMember | 22 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = lcnb_CommercialAndIndustrialMember |  |
Commercial, secured by real estate |  |  |  |
Loan modifications classified as troubled debt restructurings [Abstract] |  |  |  |
Number of Loans | 2 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 3 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  |
Pre-Modification Recorded Balance | 896 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 1,594 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  |
Post-Modification Recorded Balance | 1,214 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 1,594 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  |
Residential real estate |  |  |  |
Loan modifications classified as troubled debt restructurings [Abstract] |  |  |  |
Number of Loans | 2 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ResidentialPortfolioSegmentMember | 6 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ResidentialPortfolioSegmentMember |  |
Pre-Modification Recorded Balance | 82 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ResidentialPortfolioSegmentMember | 508 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ResidentialPortfolioSegmentMember |  |
Post-Modification Recorded Balance | 82 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ResidentialPortfolioSegmentMember | 508 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ResidentialPortfolioSegmentMember |  |
Consumer |  |  |  |
Loan modifications classified as troubled debt restructurings [Abstract] |  |  |  |
Number of Loans | 3 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ConsumerPortfolioSegmentMember | 2 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ConsumerPortfolioSegmentMember |  |
Pre-Modification Recorded Balance | 40 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ConsumerPortfolioSegmentMember | 27 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ConsumerPortfolioSegmentMember |  |
Post-Modification Recorded Balance | 40 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ConsumerPortfolioSegmentMember | 27 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ConsumerPortfolioSegmentMember |  |
Auto loan |  |  |  |
Loan modifications classified as troubled debt restructurings [Abstract] |  |  |  |
Restructured automobile loan charged off |  |  |  | $ 13 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ConsumerLoansAutoFinancingReceivableMember

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- Definition The periodic amortization (in proportion to and over the period of estimated net servicing income or loss) of capitalized servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
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- Definition Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7524895&loc=d3e120260-111741 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
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