BASIS OF PRESENTATION (Details)	3 Months Ended
Mar. 31, 2021 subsidiary
BASIS OF PRESENTATION
Number of wholly owned subsidiaries	2

Represents the number of wholly owned subsidiaries.

No definition available.

Name:	lkfn_NumberOfWhollyOwnedSubsidiaries
Namespace Prefix:	lkfn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration