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LOANS (Total Loans Outstanding) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total commercial loans $ 2,419,737us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial $ 2,410,934us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial    
Total consumer loans 352,695us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer 351,670us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer    
Subtotal 2,772,432us-gaap_LoansAndLeasesReceivableGrossCarryingAmount 2,762,604us-gaap_LoansAndLeasesReceivableGrossCarryingAmount    
Percentage of Subtotal 100.00%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmount 100.00%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmount    
Less: Allowance for loan losses (45,677)us-gaap_LoansAndLeasesReceivableAllowance (46,262)us-gaap_LoansAndLeasesReceivableAllowance (46,137)us-gaap_LoansAndLeasesReceivableAllowance (48,797)us-gaap_LoansAndLeasesReceivableAllowance
Net deferred loan fees (219)us-gaap_LoansAndLeasesReceivableDeferredIncome (284)us-gaap_LoansAndLeasesReceivableDeferredIncome    
Loans, net 2,726,536us-gaap_LoansAndLeasesReceivableNetReportedAmount 2,716,058us-gaap_LoansAndLeasesReceivableNetReportedAmount    
Commercial and Industrial Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total commercial loans 1,078,935us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
1,035,373us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
   
Percentage of Total commercial loans 38.90%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
37.50%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
   
Less: Allowance for loan losses (23,024)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
(22,785)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
(21,730)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
(21,005)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
Commercial and Industrial Loans [Member] | Working Capital Lines Of Credit Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total commercial loans 574,057us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= us-gaap_LineOfCreditMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
544,043us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= us-gaap_LineOfCreditMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
   
Percentage of Total commercial loans 20.70%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= us-gaap_LineOfCreditMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
19.70%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= us-gaap_LineOfCreditMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
   
Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total commercial loans 504,878us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= lkfn_NonWorkingCapitalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
491,330us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= lkfn_NonWorkingCapitalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
   
Percentage of Total commercial loans 18.20%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= lkfn_NonWorkingCapitalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
17.80%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= lkfn_NonWorkingCapitalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
   
Commercial Real Estate and Multi-family Residential Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total commercial loans 1,042,083us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
1,026,059us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
   
Percentage of Total commercial loans 37.60%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
37.10%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
   
Commercial Real Estate and Multi-family Residential Loans [Member] | Construction and Land Development Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total commercial loans 151,065us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
156,636us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
   
Percentage of Total commercial loans 5.40%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
5.70%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
   
Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total commercial loans 396,849us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= lkfn_OwnerOccupiedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
403,154us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= lkfn_OwnerOccupiedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
   
Percentage of Total commercial loans 14.30%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= lkfn_OwnerOccupiedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
14.60%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= lkfn_OwnerOccupiedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
   
Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total commercial loans 399,842us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= lkfn_NonownerOccupiedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
394,458us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= lkfn_NonownerOccupiedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
   
Percentage of Total commercial loans 14.40%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= lkfn_NonownerOccupiedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
14.30%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= lkfn_NonownerOccupiedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
   
Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total commercial loans 94,327us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= lkfn_MultifamilyLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
71,811us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= lkfn_MultifamilyLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
   
Percentage of Total commercial loans 3.40%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= lkfn_MultifamilyLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
2.60%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= lkfn_MultifamilyLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
   
Agri-business and Agricultural Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total commercial loans 216,241us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_AgriBusinessAndAgriculturalLoansMember
273,787us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_AgriBusinessAndAgriculturalLoansMember
   
Percentage of Total commercial loans 7.80%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_AgriBusinessAndAgriculturalLoansMember
9.90%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_AgriBusinessAndAgriculturalLoansMember
   
Less: Allowance for loan losses (1,627)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_AgriBusinessAndAgriculturalLoansMember
(1,790)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_AgriBusinessAndAgriculturalLoansMember
(1,408)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_AgriBusinessAndAgriculturalLoansMember
(1,682)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_AgriBusinessAndAgriculturalLoansMember
Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total commercial loans 119,934us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= lkfn_LoansSecuredByFarmlandMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_AgriBusinessAndAgriculturalLoansMember
137,407us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= lkfn_LoansSecuredByFarmlandMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_AgriBusinessAndAgriculturalLoansMember
   
Percentage of Total commercial loans 4.30%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= lkfn_LoansSecuredByFarmlandMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_AgriBusinessAndAgriculturalLoansMember
5.00%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= lkfn_LoansSecuredByFarmlandMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_AgriBusinessAndAgriculturalLoansMember
   
Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total commercial loans 96,307us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= lkfn_LoansForAgriculturalProductionMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_AgriBusinessAndAgriculturalLoansMember
136,380us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= lkfn_LoansForAgriculturalProductionMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_AgriBusinessAndAgriculturalLoansMember
   
Percentage of Total commercial loans 3.50%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= lkfn_LoansForAgriculturalProductionMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_AgriBusinessAndAgriculturalLoansMember
4.90%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= lkfn_LoansForAgriculturalProductionMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_AgriBusinessAndAgriculturalLoansMember
   
Other Commerical Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total commercial loans 82,478us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_OtherCommericalLoansMember
75,715us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_OtherCommericalLoansMember
   
Percentage of Total commercial loans 87.30%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_OtherCommericalLoansMember
87.30%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_OtherCommericalLoansMember
   
Other Commerical Loans [Member] | Commercial Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percentage of Total commercial loans 3.00%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_OtherCommericalLoansMember
2.70%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_OtherCommericalLoansMember
   
Total Consumer 1 To 4 Family Mortgage Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total consumer loans 303,962us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalConsumer1To4FamilyMortgageLoansMember
302,129us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalConsumer1To4FamilyMortgageLoansMember
   
Percentage of Total consumer loans 11.00%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalConsumer1To4FamilyMortgageLoansMember
10.90%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalConsumer1To4FamilyMortgageLoansMember
   
Total Consumer 1 To 4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total consumer loans 145,289us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FirstMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalConsumer1To4FamilyMortgageLoansMember
145,167us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FirstMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalConsumer1To4FamilyMortgageLoansMember
   
Percentage of Total consumer loans 5.20%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FirstMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalConsumer1To4FamilyMortgageLoansMember
5.30%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FirstMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalConsumer1To4FamilyMortgageLoansMember
   
Total Consumer 1 To 4 Family Mortgage Loans [Member] | Open End And Junior Lien Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total consumer loans 150,007us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_SecondMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalConsumer1To4FamilyMortgageLoansMember
150,220us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_SecondMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalConsumer1To4FamilyMortgageLoansMember
   
Percentage of Total consumer loans 5.40%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_SecondMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalConsumer1To4FamilyMortgageLoansMember
5.40%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_SecondMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalConsumer1To4FamilyMortgageLoansMember
   
Total Consumer 1 To 4 Family Mortgage Loans [Member] | Residential Construction and Land Development Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total consumer loans 8,666us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancialInstrumentAxis
= lkfn_ResidentialConstructionAndLandDevelopmentLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalConsumer1To4FamilyMortgageLoansMember
6,742us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancialInstrumentAxis
= lkfn_ResidentialConstructionAndLandDevelopmentLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalConsumer1To4FamilyMortgageLoansMember
   
Percentage of Total consumer loans 0.30%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancialInstrumentAxis
= lkfn_ResidentialConstructionAndLandDevelopmentLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalConsumer1To4FamilyMortgageLoansMember
0.20%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancialInstrumentAxis
= lkfn_ResidentialConstructionAndLandDevelopmentLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalConsumer1To4FamilyMortgageLoansMember
   
Other Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total consumer loans $ 48,733us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
$ 49,541us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
   
Percentage of Total consumer loans 12.70%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
12.70%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
   
Other Consumer [Member] | Consumer Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percentage of Total consumer loans 1.80%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
1.80%lkfn_PercentageOfLoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember