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ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Loans By Class Modified As Troubled Debt Restructuring) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Modified Repayment Terms [Member]    
Troubled Debt Restructurings Modified During Period [Abstract]    
Number of Loans   2lkfn_NumberOfLoans
/ lkfn_FinancingReceivableModificationsAxis
= lkfn_ModifiedRepaymentTermsMember
Modified Repayment Terms [Member] | Minimum [Member]    
Troubled Debt Restructurings Modified During Period [Abstract]    
Extension period for modified repayment terms   12 months
Modified Repayment Terms [Member] | Maximum [Member]    
Troubled Debt Restructurings Modified During Period [Abstract]    
Extension period for modified repayment terms   15 months
All Modifications [Member]    
Troubled Debt Restructurings Modified During Period [Abstract]    
Number of Loans 1lkfn_NumberOfLoans
/ lkfn_FinancingReceivableModificationsAxis
= lkfn_AllModificationMember
3lkfn_NumberOfLoans
/ lkfn_FinancingReceivableModificationsAxis
= lkfn_AllModificationMember
Pre-Modification Outstanding Recorded Investment $ 788lkfn_FinancingReceivableModificationPreModificationRecordedInvestment
/ lkfn_FinancingReceivableModificationsAxis
= lkfn_AllModificationMember
$ 591lkfn_FinancingReceivableModificationPreModificationRecordedInvestment
/ lkfn_FinancingReceivableModificationsAxis
= lkfn_AllModificationMember
Post-Modification Outstanding Recorded Investment 788lkfn_FinancingReceivableModificationPostModificationRecordedInvestment
/ lkfn_FinancingReceivableModificationsAxis
= lkfn_AllModificationMember
592lkfn_FinancingReceivableModificationPostModificationRecordedInvestment
/ lkfn_FinancingReceivableModificationsAxis
= lkfn_AllModificationMember
Commercial and Industrial Loans [Member] | Non Working Capital Loans [Member] | Modified Repayment Terms [Member]    
Troubled Debt Restructurings Modified During Period [Abstract]    
Number of Loans   2lkfn_NumberOfLoans
/ lkfn_FinancingReceivableModificationsAxis
= lkfn_ModifiedRepaymentTermsMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= lkfn_NonWorkingCapitalLoansMember
Commercial and Industrial Loans [Member] | Non Working Capital Loans [Member] | Modified Repayment Terms [Member] | Minimum [Member]    
Troubled Debt Restructurings Modified During Period [Abstract]    
Extension period for modified repayment terms   12 months
Commercial and Industrial Loans [Member] | Non Working Capital Loans [Member] | Modified Repayment Terms [Member] | Maximum [Member]    
Troubled Debt Restructurings Modified During Period [Abstract]    
Extension period for modified repayment terms   15 months
Commercial and Industrial Loans [Member] | Non Working Capital Loans [Member] | All Modifications [Member]    
Troubled Debt Restructurings Modified During Period [Abstract]    
Number of Loans   2lkfn_NumberOfLoans
/ lkfn_FinancingReceivableModificationsAxis
= lkfn_AllModificationMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= lkfn_NonWorkingCapitalLoansMember
Pre-Modification Outstanding Recorded Investment   433lkfn_FinancingReceivableModificationPreModificationRecordedInvestment
/ lkfn_FinancingReceivableModificationsAxis
= lkfn_AllModificationMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= lkfn_NonWorkingCapitalLoansMember
Post-Modification Outstanding Recorded Investment   433lkfn_FinancingReceivableModificationPostModificationRecordedInvestment
/ lkfn_FinancingReceivableModificationsAxis
= lkfn_AllModificationMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= lkfn_NonWorkingCapitalLoansMember
Commercial Real Estate and Multi-Family Residential Loans [Member] | Owner Occupied Loans [Member] | Modified Repayment Terms [Member]    
Troubled Debt Restructurings Modified During Period [Abstract]    
Number of Loans   0lkfn_NumberOfLoans
/ lkfn_FinancingReceivableModificationsAxis
= lkfn_ModifiedRepaymentTermsMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= lkfn_OwnerOccupiedLoansMember
Commercial Real Estate and Multi-Family Residential Loans [Member] | Owner Occupied Loans [Member] | All Modifications [Member]    
Troubled Debt Restructurings Modified During Period [Abstract]    
Number of Loans 1lkfn_NumberOfLoans
/ lkfn_FinancingReceivableModificationsAxis
= lkfn_AllModificationMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= lkfn_OwnerOccupiedLoansMember
1lkfn_NumberOfLoans
/ lkfn_FinancingReceivableModificationsAxis
= lkfn_AllModificationMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= lkfn_OwnerOccupiedLoansMember
Pre-Modification Outstanding Recorded Investment 788lkfn_FinancingReceivableModificationPreModificationRecordedInvestment
/ lkfn_FinancingReceivableModificationsAxis
= lkfn_AllModificationMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= lkfn_OwnerOccupiedLoansMember
158lkfn_FinancingReceivableModificationPreModificationRecordedInvestment
/ lkfn_FinancingReceivableModificationsAxis
= lkfn_AllModificationMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= lkfn_OwnerOccupiedLoansMember
Post-Modification Outstanding Recorded Investment $ 788lkfn_FinancingReceivableModificationPostModificationRecordedInvestment
/ lkfn_FinancingReceivableModificationsAxis
= lkfn_AllModificationMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= lkfn_OwnerOccupiedLoansMember
$ 159lkfn_FinancingReceivableModificationPostModificationRecordedInvestment
/ lkfn_FinancingReceivableModificationsAxis
= lkfn_AllModificationMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= lkfn_OwnerOccupiedLoansMember