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FAIR VALUE - Valuation Methodology and Unobservable Inputs for Level 3 Assets (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($) item
Fair Value, Measurements, Nonrecurring [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans	$ 9,835	$ 12,121
Commercial and Industrial Loans [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Valuation Methodology	Collateral based measurements
Commercial and Industrial Loans [Member] | Fair Value, Measurements, Nonrecurring [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Valuation Methodology		Collateral based measurements
Unobservable Inputs	Discount to reflect current market conditions and ultimate collectability	Discount to reflect current market conditions and ultimate collectability
Commercial and Industrial Loans [Member] | Fair Value, Measurements, Nonrecurring [Member] | Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans	$ 6,098	$ 9,500
Commercial and Industrial Loans [Member] | Fair Value, Measurements, Nonrecurring [Member] | Minimum | Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	21	1
Commercial and Industrial Loans [Member] | Fair Value, Measurements, Nonrecurring [Member] | Maximum | Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	100
Commercial and Industrial Loans [Member] | Fair Value, Measurements, Nonrecurring [Member] | Weighted Average | Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	44	53
Commercial Real Estate and Multi-family Residential Loans [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Valuation Methodology	Collateral based measurements
Commercial Real Estate and Multi-family Residential Loans [Member] | Fair Value, Measurements, Nonrecurring [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Valuation Methodology		Collateral based measurements
Unobservable Inputs	Discount to reflect current market conditions and ultimate collectability	Discount to reflect current market conditions and ultimate collectability
Commercial Real Estate and Multi-family Residential Loans [Member] | Fair Value, Measurements, Nonrecurring [Member] | Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans	$ 2,678	$ 1,492
Commercial Real Estate and Multi-family Residential Loans [Member] | Fair Value, Measurements, Nonrecurring [Member] | Minimum | Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	10	7
Commercial Real Estate and Multi-family Residential Loans [Member] | Fair Value, Measurements, Nonrecurring [Member] | Maximum | Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	75	61
Commercial Real Estate and Multi-family Residential Loans [Member] | Fair Value, Measurements, Nonrecurring [Member] | Weighted Average | Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	33	27
Consumer 1-4 Family Mortgage Loans [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Valuation Methodology	Collateral based measurements
Consumer 1-4 Family Mortgage Loans [Member] | Fair Value, Measurements, Nonrecurring [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Valuation Methodology		Collateral based measurements
Unobservable Inputs	Discount to reflect current market conditions and ultimate collectability	Discount to reflect current market conditions and ultimate collectability
Consumer 1-4 Family Mortgage Loans [Member] | Fair Value, Measurements, Nonrecurring [Member] | Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans	$ 978	$ 1,061
Consumer 1-4 Family Mortgage Loans [Member] | Fair Value, Measurements, Nonrecurring [Member] | Minimum | Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	6	5
Consumer 1-4 Family Mortgage Loans [Member] | Fair Value, Measurements, Nonrecurring [Member] | Maximum | Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	17	100
Consumer 1-4 Family Mortgage Loans [Member] | Fair Value, Measurements, Nonrecurring [Member] | Weighted Average | Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	10	14
Agribusiness and Agricultural
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Valuation Methodology	Collateral based measurements
Agribusiness and Agricultural | Fair Value, Measurements, Nonrecurring [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Valuation Methodology		Collateral based measurements
Unobservable Inputs	Discount to reflect current market conditions and ultimate collectability	Discount to reflect current market conditions and ultimate collectability
Agribusiness and Agricultural | Fair Value, Measurements, Nonrecurring [Member] | Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans	$ 81	$ 57
Agribusiness and Agricultural | Fair Value, Measurements, Nonrecurring [Member] | Weighted Average | Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	44	61
Other consumer loans | Fair Value, Measurements, Nonrecurring [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Valuation Methodology		Collateral based measurements
Unobservable Inputs		Discount to reflect current market conditions and ultimate collectability
Other consumer loans | Fair Value, Measurements, Nonrecurring [Member] | Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans		$ 11
Other consumer loans | Fair Value, Measurements, Nonrecurring [Member] | Weighted Average | Collateral Based Measurements | Measurement Input, Discount Rate
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths) | item		36

X

- 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

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

X

- Definition

The description of the unobservable input used to measure the fair value of assets at the end of the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	lkfn_
Data Type:	xbrli:stringItemType
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Period Type:	duration

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- References

No definition available.

+ Details

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- Definition

Value of input used to measure debt instrument, including, but not limited to, convertible and non-convertible debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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X

- Definition

Description of the valuation processes in place for fair value measurements categorized within Level 3 of the fair value hierarchy.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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