OFFSETTING ASSETS AND LIABILITIES (Schedule of Offsetting of Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
OffSetting Derivative Asset [Abstract]
Gross Amounts of Recognized Assets	$ 2,310	$ 1,191
Gross Amounts Offset in the Statement of Financial Position	0lkfn_DerivativeAssetGrossValueOffset	0lkfn_DerivativeAssetGrossValueOffset
Net Amounts of Assets presented in the Statement of Financial Position	2,310lkfn_DerivativeAssetNetValueOffset	1,191lkfn_DerivativeAssetNetValueOffset
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset in the Statement of Financial Position, Cash Received	0	0
Net Amount	2,310us-gaap_DerivativeAssets	1,191us-gaap_DerivativeAssets
Offsetting Derivatives Liabilities [Abstract]
Gross Amounts of Recognized Liabilities	62,897	56,149
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities presented in the Statement of Financial Position	62,897lkfn_Derivativeliabilitynetvalueoffset	56,149lkfn_Derivativeliabilitynetvalueoffset
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	(60,517)	(54,907)
Gross Amounts Not Offset in the Statement of Financial Position, Cash Received	(2,050)	(1,242)
Net Amount	330us-gaap_DerivativeLiabilities	0us-gaap_DerivativeLiabilities
Interest Rate Swap [Member]
OffSetting Derivative Asset [Abstract]
Gross Amounts of Recognized Assets	2,310	1,191
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Assets presented in the Statement of Financial Position	2,310	1,191
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset in the Statement of Financial Position, Cash Received	0	0
Net Amount	2,310	1,191
Offsetting Derivatives Liabilities [Abstract]
Gross Amounts of Recognized Liabilities	2,380	1,242
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities presented in the Statement of Financial Position	2,380	1,242
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	0	0
Gross Amounts Not Offset in the Statement of Financial Position, Cash Received	(2,050)	(1,242)
Net Amount	330	0
Repurchase Agreements [Member]
Offsetting Derivatives Liabilities [Abstract]
Gross Amounts of Recognized Liabilities	60,517	54,907
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities presented in the Statement of Financial Position	60,517	54,907
Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	(60,517)	(54,907)
Gross Amounts Not Offset in the Statement of Financial Position, Cash Received	0	0
Net Amount	$ 0	$ 0

Amount of obligation to return cash collateral under master netting arrangements not offset against derivative assets.

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Derivative Asset Gross Value Offset.

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Derivative Asset Net Value Offset.

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Derivative Liability Collateral Right To Reclaim Cash Offsets.

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Derivative Liability Gross Value Offset.

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Derivative Liability Net Value Offset.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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