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FAIR VALUE DISCLOSURES (Quantitative Information about Level 3 Fair Value Measurements) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Discount To Benchmark Index [Member] | Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range of Inputs (Average) (in hundredths) 0.00%us-gaap_FairValueInputsDiscountRate
/ lkfn_FairValueMeasurementsUnobservableInputAxis
= lkfn_DiscountToBenchmarkIndexMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 0.00%us-gaap_FairValueInputsDiscountRate
/ lkfn_FairValueMeasurementsUnobservableInputAxis
= lkfn_DiscountToBenchmarkIndexMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Discount To Benchmark Index [Member] | Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range of Inputs (Average) (in hundredths) 6.00%us-gaap_FairValueInputsDiscountRate
/ lkfn_FairValueMeasurementsUnobservableInputAxis
= lkfn_DiscountToBenchmarkIndexMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 6.00%us-gaap_FairValueInputsDiscountRate
/ lkfn_FairValueMeasurementsUnobservableInputAxis
= lkfn_DiscountToBenchmarkIndexMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Discount To Benchmark Index [Member] | Weighted Average [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range of Inputs (Average) (in hundredths) (2.56%)us-gaap_FairValueInputsDiscountRate
/ lkfn_FairValueMeasurementsUnobservableInputAxis
= lkfn_DiscountToBenchmarkIndexMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		 (2.49%)us-gaap_FairValueInputsDiscountRate
/ lkfn_FairValueMeasurementsUnobservableInputAxis
= lkfn_DiscountToBenchmarkIndexMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
State and Municipal Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total assets 810us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 850us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Valuation Technique Price to type, par, call Price to type, par, call