ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Troubled Debt Restructuring) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Troubled Debt Restructuring [Abstract]
Accruing troubled debt restructured loans	$ 13,014	$ 16,492
Nonaccrual troubled debt restructured loans	11,973	9,161
Total troubled debt restructured loans	$ 24,987lkfn_FinancingReceivableModifications	$ 25,653lkfn_FinancingReceivableModifications

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