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FAIR VALUE DISCLOSURES (Additional Information) (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Mortgage servicing rights $ 3,000,000us-gaap_ServicingAssetAtFairValueAmount      
Weighted average interest rate, residential mortgages (in hundredths) 4.02%us-gaap_MortgageLoansOnRealEstateInterestRate      
Weighted average maturity of residential mortgages 19 years      
Prepayment Speed used in unobservable assumptions 220   212  
Discount rate used to estimate fair value (in hundredths) 9.40%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate   9.40%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate  
Subtotal 2,772,432,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount   2,762,604,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount  
Valuation allowance 45,677,000us-gaap_LoansAndLeasesReceivableAllowance 46,137,000us-gaap_LoansAndLeasesReceivableAllowance 46,262,000us-gaap_LoansAndLeasesReceivableAllowance 48,797,000us-gaap_LoansAndLeasesReceivableAllowance
Recoveries 123,000us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts 91,000us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts    
Market Value Price Variance Tolerance Percentage 3.00%lkfn_MarketValuePriceVarianceTolerancePercentage      
Market Value Tolerable Value Individual Security Increase Decrease 50,000lkfn_MarketValueTolerableValueIndidualSecurityIncreaseDecrease      
Market Value Tolerable Value Increase Decrease 500,000lkfn_MarketValueTolerableValueIncreaseDecrease      
Commercial Real Estates [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]        
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Percentage of discount from appraised value (in hundredths) 0.00%lkfn_PercentageOfDiscountFromAppraisedValue
/ lkfn_AssetsPledgedAsCollateralByTypeAxis
= lkfn_CommercialRealEstatesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
Commercial Real Estates [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]        
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Percentage of discount from appraised value (in hundredths) 50.00%lkfn_PercentageOfDiscountFromAppraisedValue
/ lkfn_AssetsPledgedAsCollateralByTypeAxis
= lkfn_CommercialRealEstatesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
Inventory Finished Goods [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]        
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Percentage of discount from appraised value (in hundredths) 35.00%lkfn_PercentageOfDiscountFromAppraisedValue
/ lkfn_AssetsPledgedAsCollateralByTypeAxis
= lkfn_InventoryFinishedGoodsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
Inventory Finished Goods [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]        
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Percentage of discount from appraised value (in hundredths) 65.00%lkfn_PercentageOfDiscountFromAppraisedValue
/ lkfn_AssetsPledgedAsCollateralByTypeAxis
= lkfn_InventoryFinishedGoodsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
Finished Goods [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]        
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Percentage of discount from appraised value (in hundredths) 30.00%lkfn_PercentageOfDiscountFromAppraisedValue
/ lkfn_AssetsPledgedAsCollateralByTypeAxis
= lkfn_FinishedGoodsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
Finished Goods [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]        
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Percentage of discount from appraised value (in hundredths) 60.00%lkfn_PercentageOfDiscountFromAppraisedValue
/ lkfn_AssetsPledgedAsCollateralByTypeAxis
= lkfn_FinishedGoodsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
Inventory Work In Process [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]        
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Percentage of discount from appraised value (in hundredths) 50.00%lkfn_PercentageOfDiscountFromAppraisedValue
/ lkfn_AssetsPledgedAsCollateralByTypeAxis
= lkfn_InventoryWorkInProcessMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
Inventory Work In Process [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]        
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Percentage of discount from appraised value (in hundredths) 100.00%lkfn_PercentageOfDiscountFromAppraisedValue
/ lkfn_AssetsPledgedAsCollateralByTypeAxis
= lkfn_InventoryWorkInProcessMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
Equipment [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]        
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Percentage of discount from appraised value (in hundredths) 30.00%lkfn_PercentageOfDiscountFromAppraisedValue
/ lkfn_AssetsPledgedAsCollateralByTypeAxis
= us-gaap_EquipmentMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
Equipment [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]        
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Percentage of discount from appraised value (in hundredths) 70.00%lkfn_PercentageOfDiscountFromAppraisedValue
/ lkfn_AssetsPledgedAsCollateralByTypeAxis
= us-gaap_EquipmentMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
Marketable Securities [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]        
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Percentage of discount from appraised value (in hundredths) 10.00%lkfn_PercentageOfDiscountFromAppraisedValue
/ lkfn_AssetsPledgedAsCollateralByTypeAxis
= lkfn_MarketableSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
Marketable Securities [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]        
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Percentage of discount from appraised value (in hundredths) 30.00%lkfn_PercentageOfDiscountFromAppraisedValue
/ lkfn_AssetsPledgedAsCollateralByTypeAxis
= lkfn_MarketableSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
Impaired Loans [Member]        
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Subtotal 14,400,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ lkfn_AssetsPledgedAsCollateralByTypeAxis
= lkfn_ImpairedLoansMember		 18,100,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ lkfn_AssetsPledgedAsCollateralByTypeAxis
= lkfn_ImpairedLoansMember		    
Valuation allowance 2,800,000us-gaap_LoansAndLeasesReceivableAllowance
/ lkfn_AssetsPledgedAsCollateralByTypeAxis
= lkfn_ImpairedLoansMember		 4,200,000us-gaap_LoansAndLeasesReceivableAllowance
/ lkfn_AssetsPledgedAsCollateralByTypeAxis
= lkfn_ImpairedLoansMember		    
Recoveries 700,000us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ lkfn_AssetsPledgedAsCollateralByTypeAxis
= lkfn_ImpairedLoansMember		 2,100,000us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
/ lkfn_AssetsPledgedAsCollateralByTypeAxis
= lkfn_ImpairedLoansMember		    
Other Real Estate Owned [Member]        
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.        
Other Real Estate 147,000us-gaap_OtherRealEstate
/ lkfn_AssetsPledgedAsCollateralByTypeAxis
= lkfn_OtherRealEstateOwnedMember		 147,000us-gaap_OtherRealEstate
/ lkfn_AssetsPledgedAsCollateralByTypeAxis
= lkfn_OtherRealEstateOwnedMember		    
Real Estate Owned, Valuation Allowance 72,000us-gaap_RealEstateOwnedValuationAllowance
/ lkfn_AssetsPledgedAsCollateralByTypeAxis
= lkfn_OtherRealEstateOwnedMember		 72,000us-gaap_RealEstateOwnedValuationAllowance
/ lkfn_AssetsPledgedAsCollateralByTypeAxis
= lkfn_OtherRealEstateOwnedMember		    
Impaired Loans Fair Value Disclosure $ 75,000lkfn_ImpairedLoansFairValueDisclosure
/ lkfn_AssetsPledgedAsCollateralByTypeAxis
= lkfn_OtherRealEstateOwnedMember		 $ 75,000lkfn_ImpairedLoansFairValueDisclosure
/ lkfn_AssetsPledgedAsCollateralByTypeAxis
= lkfn_OtherRealEstateOwnedMember