ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Troubled Debt Restructuring) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Troubled Debt Restructuring [Abstract]
Accruing troubled debt restructured loans	$ 6,196	$ 8,016
Nonaccrual troubled debt restructured loans	3,812	4,384
Total troubled debt restructured loans	$ 10,008	$ 12,400

Reflects the carrying amount of loans that are not accruing interest with terms that have been modified because of the inability of the borrower, for financial reasons, to comply with the terms of the original loan agreement.

No definition available.

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