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FAIR VALUE (Valuation Methodology and Unobservable Inputs for Level 3 Assets) (Details) - Non-Recurring [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Number	Dec. 31, 2017 USD ($) Number
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans | $	$ 11,506	$ 4,432
Commercial and Industrial Loans [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans | $	$ 9,059	$ 2,627
Valuation Methodology	Collateral based measurements	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] | Minimum [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	4	23
Commercial and Industrial Loans [Member] | Maximum [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	100	100
Commercial and Industrial Loans [Member] | Weighted Average [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	48	37
Commercial real estate [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans | $	$ 1,817	$ 1,610
Valuation Methodology	Collateral based measurements	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 [Member] | Minimum [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	6	2
Commercial real estate [Member] | Maximum [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	53	58
Commercial real estate [Member] | Weighted Average [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	34	33
Consumer 1-4 Family Mortgage Loans [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans | $	$ 553	$ 195
Valuation Methodology	Collateral based measurements	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] | Minimum [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	0
Consumer 1-4 Family Mortgage Loans [Member] | Maximum [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	64
Consumer 1-4 Family Mortgage Loans [Member] | Weighted Average [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	23	17
Other Real Estate Owned [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans | $	$ 316
Valuation Methodology	Collateral based measurements
Unobservable Inputs	Discount to reflect current market conditions
Other Real Estate Owned [Member] | Weighted Average [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	0
Agribusiness and Agricultural [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Impaired loans | $	$ 77
Valuation Methodology	Collateral based measurements
Unobservable Inputs	Discount to reflect current market conditions and ultimate collectability
Agribusiness and Agricultural [Member] | Weighted Average [Member]
Valuation Methodology and Unobservable Inputs For Level 3 Assets Measured At Fair Value [Line Items]
Range of Inputs (Average) (in hundredths)	49

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

Name:	lkfn_ImpairedLoansFairValueDisclosure
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

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

X

- References

No definition available.

+ Details

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

X

- 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=99377789&loc=d3e19207-110258

+ Details

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Balance Type:	na
Period Type:	instant

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=99377789&loc=d3e19207-110258

+ Details

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