<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.25.4</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>897</ContextCount>
  <ElementCount>734</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>160</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>12</UnitCount>
  <MyReports>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - COVER PAGE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/COVERPAGE</Role>
      <ShortName>COVER PAGE</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0000002 - Document - AUDIT INFORMATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/AUDITINFORMATION</Role>
      <ShortName>AUDIT INFORMATION</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>9952151 - Statement - CONSOLIDATED BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/CONSOLIDATEDBALANCESHEETS</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>9952152 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/CONSOLIDATEDBALANCESHEETSParenthetical</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>9952153 - Statement - CONSOLIDATED STATEMENTS OF INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/CONSOLIDATEDSTATEMENTSOFINCOME</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF INCOME</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>9952154 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>9952155 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/CONSOLIDATEDSTATEMENTSOFCHANGESINSTOCKHOLDERSEQUITY</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>9952156 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/CONSOLIDATEDSTATEMENTSOFCHANGESINSTOCKHOLDERSEQUITYParenthetical</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>9952157 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>9952158 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>9952159 - Disclosure - SECURITIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/SECURITIES</Role>
      <ShortName>SECURITIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>9952160 - Disclosure - LOANS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/LOANS</Role>
      <ShortName>LOANS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>9952161 - Disclosure - ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/ALLOWANCEFORCREDITLOSSESANDCREDITQUALITY</Role>
      <ShortName>ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>9952162 - Disclosure - FAIR VALUE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/FAIRVALUE</Role>
      <ShortName>FAIR VALUE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>9952163 - Disclosure - LAND, PREMISES AND EQUIPMENT, NET</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/LANDPREMISESANDEQUIPMENTNET</Role>
      <ShortName>LAND, PREMISES AND EQUIPMENT, NET</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>9952164 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/GOODWILLANDOTHERINTANGIBLEASSETS</Role>
      <ShortName>GOODWILL AND OTHER INTANGIBLE ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>9952165 - Disclosure - DEPOSITS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/DEPOSITS</Role>
      <ShortName>DEPOSITS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>9952166 - Disclosure - BORROWINGS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/BORROWINGS</Role>
      <ShortName>BORROWINGS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>9952167 - Disclosure - PENSION AND OTHER POSTRETIREMENT PLANS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/PENSIONANDOTHERPOSTRETIREMENTPLANS</Role>
      <ShortName>PENSION AND OTHER POSTRETIREMENT PLANS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>9952168 - Disclosure - OTHER BENEFIT PLANS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/OTHERBENEFITPLANS</Role>
      <ShortName>OTHER BENEFIT PLANS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>9952169 - Disclosure - INCOME TAXES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/INCOMETAXES</Role>
      <ShortName>INCOME TAXES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>9952170 - Disclosure - RELATED PARTY TRANSACTIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/RELATEDPARTYTRANSACTIONS</Role>
      <ShortName>RELATED PARTY TRANSACTIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>9952171 - Disclosure - STOCK BASED COMPENSATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/STOCKBASEDCOMPENSATION</Role>
      <ShortName>STOCK BASED COMPENSATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>9952172 - Disclosure - CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/CAPITALREQUIREMENTSANDRESTRICTIONSONRETAINEDEARNINGS</Role>
      <ShortName>CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>9952173 - Disclosure - OFFSETTING ASSETS AND LIABILITIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/OFFSETTINGASSETSANDLIABILITIES</Role>
      <ShortName>OFFSETTING ASSETS AND LIABILITIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>9952174 - Disclosure - COMMITMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/COMMITMENTSOFFBALANCESHEETRISKSANDCONTINGENCIES</Role>
      <ShortName>COMMITMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>9952175 - Disclosure - PARENT COMPANY STATEMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/PARENTCOMPANYSTATEMENTS</Role>
      <ShortName>PARENT COMPANY STATEMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>9952176 - Disclosure - EARNINGS PER SHARE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/EARNINGSPERSHARE</Role>
      <ShortName>EARNINGS PER SHARE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9952177 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSS</Role>
      <ShortName>ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9952178 - Disclosure - SELECTED QUARTERLY DATA (UNAUDITED)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/SELECTEDQUARTERLYDATAUNAUDITED</Role>
      <ShortName>SELECTED QUARTERLY DATA (UNAUDITED)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9952179 - Disclosure - LEASES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/LEASES</Role>
      <ShortName>LEASES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Insider Trading Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements</Role>
      <ShortName>Insider Trading Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>995447 - Disclosure - Insider Trading Policies and Procedures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc</Role>
      <ShortName>Insider Trading Policies and Procedures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure</Role>
      <ShortName>Cybersecurity Risk Management and Strategy Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9955511 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9955512 - Disclosure - SECURITIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/SECURITIESTables</Role>
      <ShortName>SECURITIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/SECURITIES</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9955513 - Disclosure - LOANS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/LOANSTables</Role>
      <ShortName>LOANS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/LOANS</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9955514 - Disclosure - ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/ALLOWANCEFORCREDITLOSSESANDCREDITQUALITYTables</Role>
      <ShortName>ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/ALLOWANCEFORCREDITLOSSESANDCREDITQUALITY</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9955515 - Disclosure - FAIR VALUE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/FAIRVALUETables</Role>
      <ShortName>FAIR VALUE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/FAIRVALUE</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9955516 - Disclosure - LAND, PREMISES AND EQUIPMENT, NET (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/LANDPREMISESANDEQUIPMENTNETTables</Role>
      <ShortName>LAND, PREMISES AND EQUIPMENT, NET (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/LANDPREMISESANDEQUIPMENTNET</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9955517 - Disclosure - DEPOSITS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/DEPOSITSTables</Role>
      <ShortName>DEPOSITS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/DEPOSITS</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9955518 - Disclosure - BORROWINGS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/BORROWINGSTables</Role>
      <ShortName>BORROWINGS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/BORROWINGS</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9955519 - Disclosure - PENSION AND OTHER POSTRETIREMENT PLANS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/PENSIONANDOTHERPOSTRETIREMENTPLANSTables</Role>
      <ShortName>PENSION AND OTHER POSTRETIREMENT PLANS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/PENSIONANDOTHERPOSTRETIREMENTPLANS</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9955520 - Disclosure - INCOME TAXES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/INCOMETAXESTables</Role>
      <ShortName>INCOME TAXES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/INCOMETAXES</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9955521 - Disclosure - RELATED PARTY TRANSACTIONS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/RELATEDPARTYTRANSACTIONSTables</Role>
      <ShortName>RELATED PARTY TRANSACTIONS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/RELATEDPARTYTRANSACTIONS</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9955522 - Disclosure - STOCK BASED COMPENSATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/STOCKBASEDCOMPENSATIONTables</Role>
      <ShortName>STOCK BASED COMPENSATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/STOCKBASEDCOMPENSATION</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>9955523 - Disclosure - CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/CAPITALREQUIREMENTSANDRESTRICTIONSONRETAINEDEARNINGSTables</Role>
      <ShortName>CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/CAPITALREQUIREMENTSANDRESTRICTIONSONRETAINEDEARNINGS</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>9955524 - Disclosure - OFFSETTING ASSETS AND LIABILITIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/OFFSETTINGASSETSANDLIABILITIESTables</Role>
      <ShortName>OFFSETTING ASSETS AND LIABILITIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/OFFSETTINGASSETSANDLIABILITIES</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>9955525 - Disclosure - COMMITMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/COMMITMENTSOFFBALANCESHEETRISKSANDCONTINGENCIESTables</Role>
      <ShortName>COMMITMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/COMMITMENTSOFFBALANCESHEETRISKSANDCONTINGENCIES</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>9955526 - Disclosure - PARENT COMPANY STATEMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/PARENTCOMPANYSTATEMENTSTables</Role>
      <ShortName>PARENT COMPANY STATEMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/PARENTCOMPANYSTATEMENTS</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>9955527 - Disclosure - EARNINGS PER SHARE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/EARNINGSPERSHARETables</Role>
      <ShortName>EARNINGS PER SHARE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/EARNINGSPERSHARE</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>9955528 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSTables</Role>
      <ShortName>ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSS</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>9955529 - Disclosure - SELECTED QUARTERLY DATA (UNAUDITED) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/SELECTEDQUARTERLYDATAUNAUDITEDTables</Role>
      <ShortName>SELECTED QUARTERLY DATA (UNAUDITED) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/SELECTEDQUARTERLYDATAUNAUDITED</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>9955530 - Disclosure - LEASES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/LEASESTables</Role>
      <ShortName>LEASES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/LEASES</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>9955531 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>9955532 - Disclosure - SECURITIES - Schedule of Information Related to the Amortized Cost, Fair Value and Allowance for Credit Losses of Securities Available-for-Sale and Related Gross Unrealized Gains and Losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/SECURITIESScheduleofInformationRelatedtotheAmortizedCostFairValueandAllowanceforCreditLossesofSecuritiesAvailableforSaleandRelatedGrossUnrealizedGainsandLossesDetails</Role>
      <ShortName>SECURITIES - Schedule of Information Related to the Amortized Cost, Fair Value and Allowance for Credit Losses of Securities Available-for-Sale and Related Gross Unrealized Gains and Losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>9955533 - Disclosure - SECURITIES - Schedule of Information Related to the Amortized Cost, Fair Value and Allowance for Credit Losses of Securities Held-to-Maturity and Related Gross Gains and Unrealized Gains and Losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/SECURITIESScheduleofInformationRelatedtotheAmortizedCostFairValueandAllowanceforCreditLossesofSecuritiesHeldtoMaturityandRelatedGrossGainsandUnrealizedGainsandLossesDetails</Role>
      <ShortName>SECURITIES - Schedule of Information Related to the Amortized Cost, Fair Value and Allowance for Credit Losses of Securities Held-to-Maturity and Related Gross Gains and Unrealized Gains and Losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>9955534 - Disclosure - SECURITIES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/SECURITIESNarrativeDetails</Role>
      <ShortName>SECURITIES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>9955535 - Disclosure - SECURITIES - Schedule of Securities By Maturity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/SECURITIESScheduleofSecuritiesByMaturityDetails</Role>
      <ShortName>SECURITIES - Schedule of Securities By Maturity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>9955536 - Disclosure - SECURITIES - Schedule of Security Proceeds, Gross Gains and Gross Losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/SECURITIESScheduleofSecurityProceedsGrossGainsandGrossLossesDetails</Role>
      <ShortName>SECURITIES - Schedule of Security Proceeds, Gross Gains and Gross Losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>9955537 - Disclosure - SECURITIES - Schedule of Unrealized Loss Analysis on Available-for-Sale Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/SECURITIESScheduleofUnrealizedLossAnalysisonAvailableforSaleSecuritiesDetails</Role>
      <ShortName>SECURITIES - Schedule of Unrealized Loss Analysis on Available-for-Sale Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>9955538 - Disclosure - SECURITIES - Schedule of Unrealized Loss Analysis on Held-to-Maturity Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/SECURITIESScheduleofUnrealizedLossAnalysisonHeldtoMaturitySecuritiesDetails</Role>
      <ShortName>SECURITIES - Schedule of Unrealized Loss Analysis on Held-to-Maturity Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>9955539 - Disclosure - SECURITIES - Schedule of Number of Securities with Unrealized Losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/SECURITIESScheduleofNumberofSecuritieswithUnrealizedLossesDetails</Role>
      <ShortName>SECURITIES - Schedule of Number of Securities with Unrealized Losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>9955540 - Disclosure - LOANS - Schedule of Total Loans Outstanding (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/LOANSScheduleofTotalLoansOutstandingDetails</Role>
      <ShortName>LOANS - Schedule of Total Loans Outstanding (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>9955541 - Disclosure - LOANS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/LOANSNarrativeDetails</Role>
      <ShortName>LOANS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>9955542 - Disclosure - ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Schedule of Activity in the Allowance for Credit Losses by Portfolio Segment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/ALLOWANCEFORCREDITLOSSESANDCREDITQUALITYScheduleofActivityintheAllowanceforCreditLossesbyPortfolioSegmentDetails</Role>
      <ShortName>ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Schedule of Activity in the Allowance for Credit Losses by Portfolio Segment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>9955543 - Disclosure - ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/ALLOWANCEFORCREDITLOSSESANDCREDITQUALITYNarrativeDetails</Role>
      <ShortName>ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>9955544 - Disclosure - ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Schedule of Risk Category of Loans by Loan Segment and Origination Date (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/ALLOWANCEFORCREDITLOSSESANDCREDITQUALITYScheduleofRiskCategoryofLoansbyLoanSegmentandOriginationDateDetails</Role>
      <ShortName>ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Schedule of Risk Category of Loans by Loan Segment and Origination Date (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>9955545 - Disclosure - ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Schedule of Aging of the Amortized Cost Basis in Past Due Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/ALLOWANCEFORCREDITLOSSESANDCREDITQUALITYScheduleofAgingoftheAmortizedCostBasisinPastDueLoansDetails</Role>
      <ShortName>ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Schedule of Aging of the Amortized Cost Basis in Past Due Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>9955546 - Disclosure - ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Schedule of Amortized Cost Basis of Collateral Dependent Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/ALLOWANCEFORCREDITLOSSESANDCREDITQUALITYScheduleofAmortizedCostBasisofCollateralDependentLoansDetails</Role>
      <ShortName>ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Schedule of Amortized Cost Basis of Collateral Dependent Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>9955547 - Disclosure - ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Schedule of Amortized Cost Basis at the End of the Reporting Period of Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/ALLOWANCEFORCREDITLOSSESANDCREDITQUALITYScheduleofAmortizedCostBasisattheEndoftheReportingPeriodofLoansDetails</Role>
      <ShortName>ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Schedule of Amortized Cost Basis at the End of the Reporting Period of Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>9955548 - Disclosure - ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Schedule of Financial Effect of the Loan Modifications (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/ALLOWANCEFORCREDITLOSSESANDCREDITQUALITYScheduleofFinancialEffectoftheLoanModificationsDetails</Role>
      <ShortName>ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Schedule of Financial Effect of the Loan Modifications (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>9955549 - Disclosure - FAIR VALUE - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/FAIRVALUENarrativeDetails</Role>
      <ShortName>FAIR VALUE - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>9955550 - Disclosure - FAIR VALUE - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/FAIRVALUEScheduleofAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails</Role>
      <ShortName>FAIR VALUE - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>9955551 - Disclosure - FAIR VALUE - Schedule of Assets Measured at Fair Value on a Non-Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/FAIRVALUEScheduleofAssetsMeasuredatFairValueonaNonRecurringBasisDetails</Role>
      <ShortName>FAIR VALUE - Schedule of Assets Measured at Fair Value on a Non-Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>9955552 - Disclosure - FAIR VALUE - Schedule of Valuation Methodology and Unobservable Inputs for Level 3 Assets Measured at Fair Value on a Non-Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/FAIRVALUEScheduleofValuationMethodologyandUnobservableInputsforLevel3AssetsMeasuredatFairValueonaNonRecurringBasisDetails</Role>
      <ShortName>FAIR VALUE - Schedule of Valuation Methodology and Unobservable Inputs for Level 3 Assets Measured at Fair Value on a Non-Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>9955553 - Disclosure - FAIR VALUE - Schedule of Estimated Fair Values and Related Carrying Values of Financial Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/FAIRVALUEScheduleofEstimatedFairValuesandRelatedCarryingValuesofFinancialInstrumentsDetails</Role>
      <ShortName>FAIR VALUE - Schedule of Estimated Fair Values and Related Carrying Values of Financial Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>9955554 - Disclosure - LAND, PREMISES AND EQUIPMENT, NET (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/LANDPREMISESANDEQUIPMENTNETDetails</Role>
      <ShortName>LAND, PREMISES AND EQUIPMENT, NET (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/LANDPREMISESANDEQUIPMENTNETTables</ParentRole>
      <Position>78</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>9955555 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/GOODWILLANDOTHERINTANGIBLEASSETSDetails</Role>
      <ShortName>GOODWILL AND OTHER INTANGIBLE ASSETS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/GOODWILLANDOTHERINTANGIBLEASSETS</ParentRole>
      <Position>79</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>9955556 - Disclosure - DEPOSITS - Schedule of Total Deposits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/DEPOSITSScheduleofTotalDepositsDetails</Role>
      <ShortName>DEPOSITS - Schedule of Total Deposits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>9955557 - Disclosure - DEPOSITS - Schedule of Maturities of Time Deposits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/DEPOSITSScheduleofMaturitiesofTimeDepositsDetails</Role>
      <ShortName>DEPOSITS - Schedule of Maturities of Time Deposits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>9955558 - Disclosure - BORROWINGS - Schedule of Advances From the Federal Home Loan Bank of Indianapolis ("FHLBI") (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/BORROWINGSScheduleofAdvancesFromtheFederalHomeLoanBankofIndianapolisFHLBIDetails</Role>
      <ShortName>BORROWINGS - Schedule of Advances From the Federal Home Loan Bank of Indianapolis ("FHLBI") (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>9955559 - Disclosure - BORROWINGS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/BORROWINGSNarrativeDetails</Role>
      <ShortName>BORROWINGS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>9955560 - Disclosure - PENSION AND OTHER POSTRETIREMENT PLANS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/PENSIONANDOTHERPOSTRETIREMENTPLANSNarrativeDetails</Role>
      <ShortName>PENSION AND OTHER POSTRETIREMENT PLANS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>9955561 - Disclosure - PENSION AND OTHER POSTRETIREMENT PLANS - Schedule of Employee Benefit Plans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/PENSIONANDOTHERPOSTRETIREMENTPLANSScheduleofEmployeeBenefitPlansDetails</Role>
      <ShortName>PENSION AND OTHER POSTRETIREMENT PLANS - Schedule of Employee Benefit Plans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>9955562 - Disclosure - PENSION AND OTHER POSTRETIREMENT PLANS - Schedule of Amounts Recognized in Consolidated Balance Sheets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/PENSIONANDOTHERPOSTRETIREMENTPLANSScheduleofAmountsRecognizedinConsolidatedBalanceSheetsDetails</Role>
      <ShortName>PENSION AND OTHER POSTRETIREMENT PLANS - Schedule of Amounts Recognized in Consolidated Balance Sheets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>9955563 - Disclosure - PENSION AND OTHER POSTRETIREMENT PLANS - Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/PENSIONANDOTHERPOSTRETIREMENTPLANSScheduleofAmountsRecognizedinAccumulatedOtherComprehensiveIncomeLossDetails</Role>
      <ShortName>PENSION AND OTHER POSTRETIREMENT PLANS - Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>9955564 - Disclosure - PENSION AND OTHER POSTRETIREMENT PLANS - Schedule of Net Period Benefit Cost and Other Amounts Recognized in Other Comprehensive Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/PENSIONANDOTHERPOSTRETIREMENTPLANSScheduleofNetPeriodBenefitCostandOtherAmountsRecognizedinOtherComprehensiveIncomeLossDetails</Role>
      <ShortName>PENSION AND OTHER POSTRETIREMENT PLANS - Schedule of Net Period Benefit Cost and Other Amounts Recognized in Other Comprehensive Income (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>9955565 - Disclosure - PENSION AND OTHER POSTRETIREMENT PLANS - Schedule of Assumptions Used in Calculating the Net Benefit Obligation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/PENSIONANDOTHERPOSTRETIREMENTPLANSScheduleofAssumptionsUsedinCalculatingtheNetBenefitObligationDetails</Role>
      <ShortName>PENSION AND OTHER POSTRETIREMENT PLANS - Schedule of Assumptions Used in Calculating the Net Benefit Obligation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>9955566 - Disclosure - PENSION AND OTHER POSTRETIREMENT PLANS - Schedule of Allocation of Plan Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/PENSIONANDOTHERPOSTRETIREMENTPLANSScheduleofAllocationofPlanAssetsDetails</Role>
      <ShortName>PENSION AND OTHER POSTRETIREMENT PLANS - Schedule of Allocation of Plan Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>9955567 - Disclosure - PENSION AND OTHER POSTRETIREMENT PLANS - Schedule of Fair Values of Pension Plan and Postretirement Plan Assets by Asset Category (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/PENSIONANDOTHERPOSTRETIREMENTPLANSScheduleofFairValuesofPensionPlanandPostretirementPlanAssetsbyAssetCategoryDetails</Role>
      <ShortName>PENSION AND OTHER POSTRETIREMENT PLANS - Schedule of Fair Values of Pension Plan and Postretirement Plan Assets by Asset Category (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>9955568 - Disclosure - PENSION AND OTHER POSTRETIREMENT PLANS - Schedule of Benefit Payments are Expected to be Paid (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/PENSIONANDOTHERPOSTRETIREMENTPLANSScheduleofBenefitPaymentsareExpectedtobePaidDetails</Role>
      <ShortName>PENSION AND OTHER POSTRETIREMENT PLANS - Schedule of Benefit Payments are Expected to be Paid (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>9955569 - Disclosure - OTHER BENEFIT PLANS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/OTHERBENEFITPLANSDetails</Role>
      <ShortName>OTHER BENEFIT PLANS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/OTHERBENEFITPLANS</ParentRole>
      <Position>93</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>9955570 - Disclosure - INCOME TAXES - Schedule of Income Tax Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/INCOMETAXESScheduleofIncomeTaxExpenseDetails</Role>
      <ShortName>INCOME TAXES - Schedule of Income Tax Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>9955571 - Disclosure - INCOME TAXES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/INCOMETAXESNarrativeDetails</Role>
      <ShortName>INCOME TAXES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>9955572 - Disclosure - INCOME TAXES - Schedule of Differences Between Financial Statement Tax Expense and Amounts Computed by Applying Statutory Federal Income Tax Rate (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/INCOMETAXESScheduleofDifferencesBetweenFinancialStatementTaxExpenseandAmountsComputedbyApplyingStatutoryFederalIncomeTaxRateDetails</Role>
      <ShortName>INCOME TAXES - Schedule of Differences Between Financial Statement Tax Expense and Amounts Computed by Applying Statutory Federal Income Tax Rate (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>9955573 - Disclosure - INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/INCOMETAXESScheduleofDeferredTaxAssetsandLiabilitiesDetails</Role>
      <ShortName>INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>9955574 - Disclosure - RELATED PARTY TRANSACTIONS - Schedule of Loans to Principal Officers, Directors, and their Affiliates (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/RELATEDPARTYTRANSACTIONSScheduleofLoanstoPrincipalOfficersDirectorsandtheirAffiliatesDetails</Role>
      <ShortName>RELATED PARTY TRANSACTIONS - Schedule of Loans to Principal Officers, Directors, and their Affiliates (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>98</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>9955575 - Disclosure - RELATED PARTY TRANSACTIONS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/RELATEDPARTYTRANSACTIONSNarrativeDetails</Role>
      <ShortName>RELATED PARTY TRANSACTIONS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>99</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>9955576 - Disclosure - STOCK BASED COMPENSATION - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/STOCKBASEDCOMPENSATIONNarrativeDetails</Role>
      <ShortName>STOCK BASED COMPENSATION - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>100</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R101.htm</HtmlFileName>
      <LongName>9955577 - Disclosure - STOCK BASED COMPENSATION - Schedule of Changes in the Non-Vested Restricted Stock Awards and Units and Non-Vested Performance Stock Units (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/STOCKBASEDCOMPENSATIONScheduleofChangesintheNonVestedRestrictedStockAwardsandUnitsandNonVestedPerformanceStockUnitsDetails</Role>
      <ShortName>STOCK BASED COMPENSATION - Schedule of Changes in the Non-Vested Restricted Stock Awards and Units and Non-Vested Performance Stock Units (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>101</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R102.htm</HtmlFileName>
      <LongName>9955578 - Disclosure - CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS - Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/CAPITALREQUIREMENTSANDRESTRICTIONSONRETAINEDEARNINGSScheduleofCompliancewithRegulatoryCapitalRequirementsunderBankingRegulationsDetails</Role>
      <ShortName>CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS - Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>102</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R103.htm</HtmlFileName>
      <LongName>9955579 - Disclosure - CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/CAPITALREQUIREMENTSANDRESTRICTIONSONRETAINEDEARNINGSNarrativeDetails</Role>
      <ShortName>CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/CAPITALREQUIREMENTSANDRESTRICTIONSONRETAINEDEARNINGSTables</ParentRole>
      <Position>103</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R104.htm</HtmlFileName>
      <LongName>9955580 - Disclosure - OFFSETTING ASSETS AND LIABILITIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/OFFSETTINGASSETSANDLIABILITIESDetails</Role>
      <ShortName>OFFSETTING ASSETS AND LIABILITIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/OFFSETTINGASSETSANDLIABILITIESTables</ParentRole>
      <Position>104</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R105.htm</HtmlFileName>
      <LongName>9955581 - Disclosure - COMMITMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES - Schedule of Financial Instruments Include Commitments to Make Loans and Open-Ended Revolving Lines of Credit (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/COMMITMENTSOFFBALANCESHEETRISKSANDCONTINGENCIESScheduleofFinancialInstrumentsIncludeCommitmentstoMakeLoansandOpenEndedRevolvingLinesofCreditDetails</Role>
      <ShortName>COMMITMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES - Schedule of Financial Instruments Include Commitments to Make Loans and Open-Ended Revolving Lines of Credit (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>105</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R106.htm</HtmlFileName>
      <LongName>9955582 - Disclosure - COMMITMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES - Schedule of Interest Rate Ranges on Commitments and Open-Ended Revolving Lines of Credit (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/COMMITMENTSOFFBALANCESHEETRISKSANDCONTINGENCIESScheduleofInterestRateRangesonCommitmentsandOpenEndedRevolvingLinesofCreditDetails</Role>
      <ShortName>COMMITMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES - Schedule of Interest Rate Ranges on Commitments and Open-Ended Revolving Lines of Credit (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>106</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R107.htm</HtmlFileName>
      <LongName>9955583 - Disclosure - PARENT COMPANY STATEMENTS - Schedule of Condensed Balance Sheets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/PARENTCOMPANYSTATEMENTSScheduleofCondensedBalanceSheetsDetails</Role>
      <ShortName>PARENT COMPANY STATEMENTS - Schedule of Condensed Balance Sheets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>107</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R108.htm</HtmlFileName>
      <LongName>9955584 - Disclosure - PARENT COMPANY STATEMENTS - Schedule of Condensed Statements of Income and Comprehensive Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/PARENTCOMPANYSTATEMENTSScheduleofCondensedStatementsofIncomeandComprehensiveIncomeLossDetails</Role>
      <ShortName>PARENT COMPANY STATEMENTS - Schedule of Condensed Statements of Income and Comprehensive Income (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>108</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R109.htm</HtmlFileName>
      <LongName>9955585 - Disclosure - PARENT COMPANY STATEMENTS - Schedule of Condensed Statements of Cash Flows (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/PARENTCOMPANYSTATEMENTSScheduleofCondensedStatementsofCashFlowsDetails</Role>
      <ShortName>PARENT COMPANY STATEMENTS - Schedule of Condensed Statements of Cash Flows (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>109</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R110.htm</HtmlFileName>
      <LongName>9955586 - Disclosure - EARNINGS PER SHARE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/EARNINGSPERSHAREDetails</Role>
      <ShortName>EARNINGS PER SHARE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/EARNINGSPERSHARETables</ParentRole>
      <Position>110</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R111.htm</HtmlFileName>
      <LongName>9955587 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Changes in Each Classification of Accumulated Other Comprehensive Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSScheduleofChangesinEachClassificationofAccumulatedOtherComprehensiveIncomeLossDetails</Role>
      <ShortName>ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Changes in Each Classification of Accumulated Other Comprehensive Income (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSTables</ParentRole>
      <Position>111</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R112.htm</HtmlFileName>
      <LongName>9955588 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSScheduleofReclassificationsOutofAccumulatedOtherComprehensiveIncomeLossDetails</Role>
      <ShortName>ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSTables</ParentRole>
      <Position>112</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R113.htm</HtmlFileName>
      <LongName>9955589 - Disclosure - SELECTED QUARTERLY DATA (UNAUDITED) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/SELECTEDQUARTERLYDATAUNAUDITEDDetails</Role>
      <ShortName>SELECTED QUARTERLY DATA (UNAUDITED) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.lakeland.com/role/SELECTEDQUARTERLYDATAUNAUDITEDTables</ParentRole>
      <Position>113</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R114.htm</HtmlFileName>
      <LongName>9955590 - Disclosure - LEASES - Schedule of Maturity Analysis of the Operating Lease Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/LEASESScheduleofMaturityAnalysisoftheOperatingLeaseLiabilitiesDetails</Role>
      <ShortName>LEASES - Schedule of Maturity Analysis of the Operating Lease Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>114</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R115.htm</HtmlFileName>
      <LongName>9955591 - Disclosure - LEASES - Schedule of Lease Cost (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/LEASESScheduleofLeaseCostDetails</Role>
      <ShortName>LEASES - Schedule of Lease Cost (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>115</Position>
    </Report>
    <Report instance="lkfn-20251231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R116.htm</HtmlFileName>
      <LongName>9955592 - Disclosure - LEASES - Schedule of Other Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lakeland.com/role/LEASESScheduleofOtherInformationDetails</Role>
      <ShortName>LEASES - Schedule of Other Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>116</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-K" isDefinitelyFs="true" isUsgaap="true" original="lkfn-20251231.htm">lkfn-20251231.htm</File>
    <File>lkfn-20251231.xsd</File>
    <File>lkfn-20251231_cal.xml</File>
    <File>lkfn-20251231_def.xml</File>
    <File>lkfn-20251231_lab.xml</File>
    <File>lkfn-20251231_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>lkfn-20251231_g1.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="3">http://fasb.org/srt/2025</BaseTaxonomy>
    <BaseTaxonomy items="3378">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="15">http://xbrl.sec.gov/cyd/2025</BaseTaxonomy>
    <BaseTaxonomy items="39">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="5">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
