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

Represents the total amount drawn.

No definition available.

Name:	lkfn_AmountOfDepositsDrawn
Namespace Prefix:	lkfn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the total amount available to the Bank.

No definition available.

Name:	lkfn_DepositsAvailableToBank
Namespace Prefix:	lkfn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

No definition available.

Name:	us-gaap_DepositsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration