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DEPOSITS - Additional information (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
DEPOSITS |  |
Total amount available to the Bank | $ 100.0 | $ 200.0
Total amount drawn | $ 10.1 | $ 75.1

X
- Definition Represents the total amount drawn. + References No definition available. + Details
Name: | lkfn_AmountOfDepositsDrawn
Namespace Prefix: | lkfn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the total amount available to the Bank. + References No definition available. + Details
Name: | lkfn_DepositsAvailableToBank
Namespace Prefix: | lkfn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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