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

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