XML 14 R48.htm IDEA: XBRL DOCUMENT v2.4.1.9
FAIR VALUE DISCLOSURES (Assets Measured at Fair Value on a Nonrecurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans $ 11,639lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
$ 11,031lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Other real estate owned 75lkfn_OtherRealEstateOwnedFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
75lkfn_OtherRealEstateOwnedFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Total assets 11,714us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
11,106us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Other real estate owned 0lkfn_OtherRealEstateOwnedFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
0lkfn_OtherRealEstateOwnedFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Total assets 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Other real estate owned 0lkfn_OtherRealEstateOwnedFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
0lkfn_OtherRealEstateOwnedFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Total assets 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
0us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 11,639lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
11,031lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Other real estate owned 75lkfn_OtherRealEstateOwnedFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
75lkfn_OtherRealEstateOwnedFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Total assets 11,714us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
11,106us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Residential Construction Loans [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans   73lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= lkfn_ResidentialConstructionLoansMember
Residential Construction Loans [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans   0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= lkfn_ResidentialConstructionLoansMember
Residential Construction Loans [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans   0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= lkfn_ResidentialConstructionLoansMember
Residential Construction Loans [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans   73lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= lkfn_ResidentialConstructionLoansMember
Commercial and Industrial Loans [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 2,405lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
2,788lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
Commercial and Industrial Loans [Member] | Working Capital Lines of Credit Loans [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 348lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
531lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
Commercial and Industrial Loans [Member] | Working Capital Lines of Credit Loans [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
Commercial and Industrial Loans [Member] | Working Capital Lines of Credit Loans [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
Commercial and Industrial Loans [Member] | Working Capital Lines of Credit Loans [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 348lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
531lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
Commercial and Industrial Loans [Member] | Non Working Capital Loans [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 2,057lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= lkfn_NonWorkingCapitalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
2,257lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= lkfn_NonWorkingCapitalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
Commercial and Industrial Loans [Member] | Non Working Capital Loans [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= lkfn_NonWorkingCapitalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= lkfn_NonWorkingCapitalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
Commercial and Industrial Loans [Member] | Non Working Capital Loans [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= lkfn_NonWorkingCapitalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= lkfn_NonWorkingCapitalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
Commercial and Industrial Loans [Member] | Non Working Capital Loans [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 2,057lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= lkfn_NonWorkingCapitalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
2,257lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= lkfn_NonWorkingCapitalLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= lkfn_TotalCommercialAndIndustrialLoansMember
Commercial Real Estate and Multi-Family Residential Loans [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 7,989lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
7,538lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate and Multi-Family Residential Loans [Member] | Construction and Land Development Loans [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 346lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
341lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate and Multi-Family Residential Loans [Member] | Construction and Land Development Loans [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
0lkfn_ImpairedLoansFairValueDisclosure
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate and Multi-Family Residential Loans [Member] | Construction and Land Development Loans [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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0lkfn_ImpairedLoansFairValueDisclosure
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= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate and Multi-Family Residential Loans [Member] | Construction and Land Development Loans [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 346lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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= us-gaap_CommercialRealEstatePortfolioSegmentMember
341lkfn_ImpairedLoansFairValueDisclosure
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= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate and Multi-Family Residential Loans [Member] | Owner Occupied Loans [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 4,530lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_FinancialInstrumentAxis
= lkfn_OwnerOccupiedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
4,084lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= lkfn_OwnerOccupiedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate and Multi-Family Residential Loans [Member] | Owner Occupied Loans [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 0lkfn_ImpairedLoansFairValueDisclosure
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_FinancialInstrumentAxis
= lkfn_OwnerOccupiedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= lkfn_OwnerOccupiedLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate and Multi-Family Residential Loans [Member] | Owner Occupied Loans [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
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Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
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Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
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0lkfn_ImpairedLoansFairValueDisclosure
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Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
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Commercial Real Estate and Multi-Family Residential Loans [Member] | Nonowner Occupied Loans [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
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/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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3,113lkfn_ImpairedLoansFairValueDisclosure
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Agri-business and Agricultural Loans [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 190lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
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189lkfn_ImpairedLoansFairValueDisclosure
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Agri-business and Agricultural Loans [Member] | Loans Secured by Farmland [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 190lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
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189lkfn_ImpairedLoansFairValueDisclosure
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Agri-business and Agricultural Loans [Member] | Loans Secured by Farmland [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
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0lkfn_ImpairedLoansFairValueDisclosure
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Agri-business and Agricultural Loans [Member] | Loans Secured by Farmland [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
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0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
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Agri-business and Agricultural Loans [Member] | Loans Secured by Farmland [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 190lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
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189lkfn_ImpairedLoansFairValueDisclosure
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
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Other Commerical Loans [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans   15lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
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Other Commerical Loans [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans   15lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
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Other Commerical Loans [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans   0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
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Other Commerical Loans [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans   0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
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Other Commerical Loans [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans   15lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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Consumer 1-4 Family Mortgage Loans [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 1,029lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
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472lkfn_ImpairedLoansFairValueDisclosure
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Consumer 1-4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 999lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
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399lkfn_ImpairedLoansFairValueDisclosure
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Consumer 1-4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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0lkfn_ImpairedLoansFairValueDisclosure
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Consumer 1-4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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0lkfn_ImpairedLoansFairValueDisclosure
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Consumer 1-4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 999lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_FinancialInstrumentAxis
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
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399lkfn_ImpairedLoansFairValueDisclosure
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/ us-gaap_FinancialInstrumentAxis
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
Consumer 1-4 Family Mortgage Loans [Member] | Open End and Junior Lien Loans [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 30lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_FinancialInstrumentAxis
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
 
Consumer 1-4 Family Mortgage Loans [Member] | Open End and Junior Lien Loans [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_FinancialInstrumentAxis
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
 
Consumer 1-4 Family Mortgage Loans [Member] | Open End and Junior Lien Loans [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_FinancialInstrumentAxis
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
 
Consumer 1-4 Family Mortgage Loans [Member] | Open End and Junior Lien Loans [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 30lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancialInstrumentAxis
= lkfn_OpenEndAndJuniorLienLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
 
Other Consumer [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 26lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
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29lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
Other Consumer [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
Other Consumer [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans 0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
0lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
Other Consumer [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Assets Measured At Fair Value On Nonrecurring Basis [Line Items]    
Impaired loans $ 26lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
$ 29lkfn_ImpairedLoansFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerOtherFinancingReceivableMember