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ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Troubled Debt Restructuring) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Troubled Debt Restructuring [Abstract]
Accruing troubled debt restructured loans	$ 6,082	$ 8,016
Nonaccrual troubled debt restructured loans	3,512	4,384
Total troubled debt restructured loans	$ 9,594	$ 12,400

X

- Definition

The amount related to financing receivables that have been modified by troubled debt restructurings.

+ References

No definition available.

+ Details

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

X

- Definition

Reflects the carrying amount of loans 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.

+ References

No definition available.

+ Details

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

X

- Definition

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.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	lkfn_TroubledDebtRestructuringAbstract
Namespace Prefix:	lkfn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration