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SECURITIES (Schedule Of Available Sale Of Securities By Maturity) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Maturities of Available-for-sale Debt Securities [Abstract]    
Due in one year or less $ 5,318us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Due after one year through five years 18,877us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
Due after five years through ten years 45,186us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost  
Due after ten years 31,625us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost  
Available for sale securities with maturities amortized cost 101,006lkfn_AvailableForSaleSecuritiesWithMaturitiesAmortizedCost  
Mortgage-backed securities 363,641us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost  
Total debt securities 464,647us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis 466,981us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Due in one year or less 5,368us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Due after one year through five years 19,761us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Due after five years through ten years 47,530us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Due after ten years 32,335us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue  
Available for sale securities with maturities fair value 104,994lkfn_AvailableForSaleSecuritiesWithMaturitiesFairValue  
Mortgage-backed securities 372,203us-gaap_MortgageBackedSecuritiesAvailableForSaleFairValueDisclosure  
Total debt securities $ 477,197us-gaap_AvailableForSaleSecurities $ 475,911us-gaap_AvailableForSaleSecurities