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ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Troubled Debt Restructuring) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Troubled Debt Restructuring [Abstract] |  |
Accruing troubled debt restructured loans | $ 6,196 | $ 8,016
Nonaccrual troubled debt restructured loans | 3,812 | 4,384
Total troubled debt restructured loans | $ 10,008 | $ 12,400

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- Definition The amount related to financing receivables that have been modified by troubled debt restructurings. + References No definition available. + Details
Name: | lkfn_FinancingReceivableModifications
Namespace Prefix: | lkfn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Reflects the carrying amount of loans accruing interest with terms that have been modified because of the inability of the borrower, for financial reasons, to comply with the terms of the original loan agreement. + References No definition available. + Details
Name: | lkfn_LoansReceivableAccruingTroubledDebtRestructuredLoans
Namespace Prefix: | lkfn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Reflects the carrying amount of loans that are not accruing interest with terms that have been modified because of the inability of the borrower, for financial reasons, to comply with the terms of the original loan agreement. + References No definition available. + Details
Name: | lkfn_LoansReceivableNonaccrualTroubledDebtRestructuredLoans
Namespace Prefix: | lkfn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | lkfn_TroubledDebtRestructuringAbstract
Namespace Prefix: | lkfn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration