NEW ACCOUNTING PRONOUNCEMENTS (Additional Information) (Details) $ in Millions	Mar. 31, 2017 USD ($)
Summary of Significant Accounting Policies [Line Items]
Operating Lease Obligations	$ 4.7

Amount of operating lease obligation due within one year or the normal operating cycle, if longer.

No definition available.

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