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FAIR VALUE DISCLOSURES (Reconciliation of All Assets Measured at Fair Value on a Recurring Basis using Significant Unobservable Inputs (Level 3)) (Details) (State and Municipal Securities [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
State and Municipal Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Balance $ 850us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= lkfn_StateAndMunicipalSecuritiesMember
$ 975us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= lkfn_StateAndMunicipalSecuritiesMember
Changes in fair value of securities included in other comprehensive income 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= lkfn_StateAndMunicipalSecuritiesMember
1us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= lkfn_StateAndMunicipalSecuritiesMember
Principal payments (40)lkfn_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPrincipalPayment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= lkfn_StateAndMunicipalSecuritiesMember
(85)lkfn_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPrincipalPayment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= lkfn_StateAndMunicipalSecuritiesMember
Balance $ 810us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= lkfn_StateAndMunicipalSecuritiesMember
$ 891us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= lkfn_StateAndMunicipalSecuritiesMember