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ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Narrative (Details) - USD ($)	9 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY
Loan amount of credit quality analysis	$ 250,000
Commitment to lend additional funds with modified loan	$ 0	$ 0

X

- Definition

It represents the information pertaining to allowance for loan losses and credit quality.

+ References

No definition available.

+ Details

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Namespace Prefix:	lkfn_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

The minimum loan amount required for credit quality analysis.

+ References

No definition available.

+ Details

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Namespace Prefix:	lkfn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of commitment to lend additional funds to debtor experiencing financial difficulty for which creditor has modified terms of financing receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481746/310-40-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 36
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-36

+ Details

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