The nine-character unique securities identifier assigned to the instrument.

No definition available.

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

- Definition

An annualized rate of default on a group of mortgages, typically within a collateralized product such as a mortgage-backed security (MBS). The constant default rate represents the percentage of outstanding principal balances in the pool that are in default, which typically equates to the home being past 180-day notices and in the foreclosure process.

+ References

No definition available.

+ Details

Name:	lkfn_ConstantDefaultRate180Days
Namespace Prefix:	lkfn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

+ References

No definition available.

+ Details

Name:	lkfn_ConstantDefaultRate30Days
Namespace Prefix:	lkfn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

+ References

No definition available.

+ Details

Name:	lkfn_ConstantDefaultRate90Days
Namespace Prefix:	lkfn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

A credit support annex provides credit protection by setting forth the rules governing the mutual posting of collateral. CSAs are used in documenting collateral arrangements between two parties that trade privately negotiated (over-the-counter) derivative securities. The trade is documented under a standard contract called a master agreement, developed by the International Swaps and Derivatives Association (ISDA). The two parties must sign the ISDA master agreement and execute a credit support annex before they trade derivatives with each other.

+ References

No definition available.

+ Details

Name:	lkfn_CreditSupport
Namespace Prefix:	lkfn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Cost Basis of non-agency residential mortgage-backed securities not issued by the federal government or government sponsored agencies.

+ References

No definition available.

+ Details

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

- Definition

Value of non-agency residential mortgage-backed securities not issued by the federal government or government sponsored agencies.

+ References

No definition available.

+ Details

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

- Definition

Par Value of non-agency residential mortgage-backed securities not issued by the federal government or government sponsored agencies.

+ References

No definition available.

+ Details

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

- Definition

Amount of unrealized gain (loss) on investments in debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

+ Details

Name:	us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Description of the credit rating indicative of likelihood of repayment of the debt instrument given by a credit rating agency (for example, Standard and Poor's, Moody's, Fitch).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

+ Details

Name:	us-gaap_DebtInstrumentCreditRating
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27340-111563

+ Details

Name:	us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

SECURITIES (Information On Securities With At Least One Rating) (Details) (USD $) In Thousands, unless otherwise specified							6 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Jun. 30, 2013 Rali2004Qs73 [Member]
Committee On Uniform Securities Identification Procedures							76110HTX7
Other Than Temporary Impairment	$ 0	$ 0	$ 0	$ 1,318	$ 869	$ 359	$ 0
Par Value							2,567
Amortized Cost							2,551
Fair Value							2,591
Unrealized Gain(Loss)							$ 40
Debt Instrument, Credit Rating							BB+
Constant Default Rate 30 Days							2.97%
Constant Default Rate 90 Days							3.30%
Constant Default Rate 180 Days							3.21%
Credit Support							9.99%