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ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Additional Information) (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Troubled Debt Restructuring [Abstract]      
Loans Modified In Troubled Debt Restructured Loans $ 3,100,000lkfn_LoansModifiedInTroubledDebtRestructuredLoans   $ 3,400,000lkfn_LoansModifiedInTroubledDebtRestructuredLoans
Loan amount of credit quality analysis 150,000lkfn_LoanAmountOfCreditQualityAnalysis    
Financing Receivable, Modifications, Recorded Investment 788,000us-gaap_FinancingReceivableModificationsRecordedInvestment 2,700,000us-gaap_FinancingReceivableModificationsRecordedInvestment  
Retail Sales [Member]      
Troubled Debt Restructuring [Abstract]      
Financing Receivable, Modifications, Recorded Investment   159,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ lkfn_PortfolioSegmentAxis
= lkfn_RetailSalesMember		  
Commercial and Industrial Loans [Member]      
Troubled Debt Restructuring [Abstract]      
Increase (decrease) in allowance for loan loss   101,000lkfn_IncreaseDecreaseInAllowanceForLoanLoss
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember		  
Commercial Real Estate and Multi-Family Residential Loans [Member]      
Troubled Debt Restructuring [Abstract]      
Increase (decrease) in allowance for loan loss $ 6,000lkfn_IncreaseDecreaseInAllowanceForLoanLoss
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 $ 6,000lkfn_IncreaseDecreaseInAllowanceForLoanLoss
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember