ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Troubled Debt Restructuring (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY
Accruing troubled debt restructured loans	$ 5,111	$ 5,237
Nonaccrual troubled debt restructured loans	6,508	6,476
Total troubled debt restructured loans	$ 11,619	$ 11,713

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