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SECURITIES (Quantitative Disclosure Of Available Sale Of Securities) (Details)
Mar. 31, 2015
Number
Dec. 31, 2014
Number
Number of securities with unrealized losses [Abstract]    
Number of available-for-sale securities in unrealized loss positions, less than 12 months 33lkfn_NumberOfAvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosuremNumberOfPositionsLessThan12Months 17lkfn_NumberOfAvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosuremNumberOfPositionsLessThan12Months
Number of available-for-sale securities in unrealized loss positions, 12 months or more 22lkfn_NumberOfAvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosuremNumberOfPositions12MonthsOrMore 56lkfn_NumberOfAvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosuremNumberOfPositions12MonthsOrMore
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions 55us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1 73us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
Agency Residential Mortgage-Backed Securities [Member]    
Number of securities with unrealized losses [Abstract]    
Number of available-for-sale securities in unrealized loss positions, less than 12 months 14lkfn_NumberOfAvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosuremNumberOfPositionsLessThan12Months
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
9lkfn_NumberOfAvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosuremNumberOfPositionsLessThan12Months
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Number of available-for-sale securities in unrealized loss positions, 12 months or more 9lkfn_NumberOfAvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosuremNumberOfPositions12MonthsOrMore
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
27lkfn_NumberOfAvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosuremNumberOfPositions12MonthsOrMore
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions 23us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
36us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
State and Municipal Securities [Member]    
Number of securities with unrealized losses [Abstract]    
Number of available-for-sale securities in unrealized loss positions, less than 12 months 19lkfn_NumberOfAvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosuremNumberOfPositionsLessThan12Months
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
8lkfn_NumberOfAvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosuremNumberOfPositionsLessThan12Months
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Number of available-for-sale securities in unrealized loss positions, 12 months or more 13lkfn_NumberOfAvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosuremNumberOfPositions12MonthsOrMore
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
29lkfn_NumberOfAvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosuremNumberOfPositions12MonthsOrMore
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions 32us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
37us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember