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FAIR VALUE - Schedule of Valuation Methodology and Unobservable Inputs for Level 3 Assets Measured at Fair Value on a Non-Recurring Basis (Details) - Fair Value, Measurements, Nonrecurring $ in Thousands	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Fair Value	$ 5,627	$ 27,151
Commercial and industrial loans: | Collateral based measurements | Discount to reflect current market conditions and ultimate collectability
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Fair Value	$ 4,789	$ 26,455
Commercial and industrial loans: | Average | Collateral based measurements | Discount to reflect current market conditions and ultimate collectability
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Inputs	0.44	0.51
Commercial and industrial loans: | Minimum | Collateral based measurements | Discount to reflect current market conditions and ultimate collectability
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Inputs	0.01	0.04
Commercial and industrial loans: | Maximum | Collateral based measurements | Discount to reflect current market conditions and ultimate collectability
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Inputs	0.99	0.99
Commercial Real Estate and Multifamily Residential | Collateral based measurements | Discount to reflect current market conditions and ultimate collectability
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Fair Value	$ 817	$ 664
Commercial Real Estate and Multifamily Residential | Average | Collateral based measurements | Discount to reflect current market conditions and ultimate collectability
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Inputs	0.37	0.54
Commercial Real Estate and Multifamily Residential | Minimum | Collateral based measurements | Discount to reflect current market conditions and ultimate collectability
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Inputs	0.13
Commercial Real Estate and Multifamily Residential | Maximum | Collateral based measurements | Discount to reflect current market conditions and ultimate collectability
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Inputs	0.61
Agri-business and agricultural loans | Collateral based measurements | Discount to reflect current market conditions and ultimate collectability
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Fair Value	$ 21	$ 32
Agri-business and agricultural loans | Average | Collateral based measurements | Discount to reflect current market conditions and ultimate collectability
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Inputs	0.61	0.54

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- Definition

This element represents the aggregate of the impaired loans reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

+ Details

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

X

- Definition

Impaired Loans, Measurement Input

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- References

No definition available.

+ Details

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- Details

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- Details

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