<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019ff1b2-d743-752a-976a-168fe5d92776,g:0ed280cc-c864-43e5-86e0-90a95f656751-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.liveoakbank.com/role/Cover" xlink:type="simple" xlink:href="lob-20260818.xsd#Cover"/>
  <link:definitionLink xlink:role="http://www.liveoakbank.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_019ff1b2-d743-74bf-9d03-719de78de308" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_019ff1b2-d743-7a6c-9a9d-8666d471fe36" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_019ff1b2-d743-74bf-9d03-719de78de308" xlink:to="loc_dei_DocumentInformationTable_019ff1b2-d743-7a6c-9a9d-8666d471fe36" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019ff1b2-d743-77cb-94b0-72d0b2454b15" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_019ff1b2-d743-7a6c-9a9d-8666d471fe36" xlink:to="loc_dei_LegalEntityAxis_019ff1b2-d743-77cb-94b0-72d0b2454b15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019ff1b2-d743-77cb-94b0-72d0b2454b15_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019ff1b2-d743-77cb-94b0-72d0b2454b15" xlink:to="loc_dei_EntityDomain_019ff1b2-d743-77cb-94b0-72d0b2454b15_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019ff1b2-d743-7f6a-8f21-71cf1eec660a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019ff1b2-d743-77cb-94b0-72d0b2454b15" xlink:to="loc_dei_EntityDomain_019ff1b2-d743-7f6a-8f21-71cf1eec660a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019ff1b2-d743-75ca-a220-58443b448cd6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_019ff1b2-d743-7a6c-9a9d-8666d471fe36" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019ff1b2-d743-75ca-a220-58443b448cd6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019ff1b2-d743-75ca-a220-58443b448cd6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019ff1b2-d743-75ca-a220-58443b448cd6" xlink:to="loc_us-gaap_ClassOfStockDomain_019ff1b2-d743-75ca-a220-58443b448cd6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019ff1b2-d743-76b8-bac6-930d071ee59c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019ff1b2-d743-75ca-a220-58443b448cd6" xlink:to="loc_us-gaap_ClassOfStockDomain_019ff1b2-d743-76b8-bac6-930d071ee59c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019ff1b2-d743-7c08-997f-efde43c2284b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ff1b2-d743-76b8-bac6-930d071ee59c" xlink:to="loc_us-gaap_CommonStockMember_019ff1b2-d743-7c08-997f-efde43c2284b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesAPreferredStockMember_019ff1b2-d743-7546-9718-0a8d871f7f6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeriesAPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ff1b2-d743-76b8-bac6-930d071ee59c" xlink:to="loc_us-gaap_SeriesAPreferredStockMember_019ff1b2-d743-7546-9718-0a8d871f7f6c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019ff1b2-d743-7bfe-975c-a1d2189acba0" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ff1b2-d743-74bf-9d03-719de78de308" xlink:to="loc_dei_DocumentType_019ff1b2-d743-7bfe-975c-a1d2189acba0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019ff1b2-d743-7619-a27b-caf960ca078f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ff1b2-d743-74bf-9d03-719de78de308" xlink:to="loc_dei_DocumentPeriodEndDate_019ff1b2-d743-7619-a27b-caf960ca078f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019ff1b2-d743-7eed-8a31-fc3e88954cea" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ff1b2-d743-74bf-9d03-719de78de308" xlink:to="loc_dei_EntityRegistrantName_019ff1b2-d743-7eed-8a31-fc3e88954cea" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019ff1b2-d743-7910-8f41-0b58e96b8123" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ff1b2-d743-74bf-9d03-719de78de308" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019ff1b2-d743-7910-8f41-0b58e96b8123" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019ff1b2-d743-71be-aba7-f45130eae7d4" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ff1b2-d743-74bf-9d03-719de78de308" xlink:to="loc_dei_EntityFileNumber_019ff1b2-d743-71be-aba7-f45130eae7d4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019ff1b2-d743-7884-95c8-b8820e6ce5f6" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ff1b2-d743-74bf-9d03-719de78de308" xlink:to="loc_dei_EntityTaxIdentificationNumber_019ff1b2-d743-7884-95c8-b8820e6ce5f6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019ff1b2-d743-7386-86e5-c7aaa7ec6b04" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ff1b2-d743-74bf-9d03-719de78de308" xlink:to="loc_dei_EntityAddressAddressLine1_019ff1b2-d743-7386-86e5-c7aaa7ec6b04" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019ff1b2-d743-71b8-af58-a092ae40cf40" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ff1b2-d743-74bf-9d03-719de78de308" xlink:to="loc_dei_EntityAddressCityOrTown_019ff1b2-d743-71b8-af58-a092ae40cf40" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019ff1b2-d743-79fa-a08d-6c7a74483344" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ff1b2-d743-74bf-9d03-719de78de308" xlink:to="loc_dei_EntityAddressStateOrProvince_019ff1b2-d743-79fa-a08d-6c7a74483344" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019ff1b2-d743-7d08-b485-5c0f393b052a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ff1b2-d743-74bf-9d03-719de78de308" xlink:to="loc_dei_EntityAddressPostalZipCode_019ff1b2-d743-7d08-b485-5c0f393b052a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019ff1b2-d743-7ad6-80e6-2c2c9e7783de" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ff1b2-d743-74bf-9d03-719de78de308" xlink:to="loc_dei_CityAreaCode_019ff1b2-d743-7ad6-80e6-2c2c9e7783de" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019ff1b2-d743-7f07-bb04-eb337720283e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ff1b2-d743-74bf-9d03-719de78de308" xlink:to="loc_dei_LocalPhoneNumber_019ff1b2-d743-7f07-bb04-eb337720283e" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_019ff1b2-d743-7afd-a7b9-606d5e68e632" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_WrittenCommunications"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ff1b2-d743-74bf-9d03-719de78de308" xlink:to="loc_dei_WrittenCommunications_019ff1b2-d743-7afd-a7b9-606d5e68e632" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_019ff1b2-d743-7c1c-bdd5-ded9aa506b72" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SolicitingMaterial"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ff1b2-d743-74bf-9d03-719de78de308" xlink:to="loc_dei_SolicitingMaterial_019ff1b2-d743-7c1c-bdd5-ded9aa506b72" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_019ff1b2-d743-7ec7-b18e-fccbe686f98c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ff1b2-d743-74bf-9d03-719de78de308" xlink:to="loc_dei_PreCommencementTenderOffer_019ff1b2-d743-7ec7-b18e-fccbe686f98c" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_019ff1b2-d743-7f56-afc6-a61d46c3232b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ff1b2-d743-74bf-9d03-719de78de308" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_019ff1b2-d743-7f56-afc6-a61d46c3232b" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019ff1b2-d743-7a63-b159-183f1f456855" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ff1b2-d743-74bf-9d03-719de78de308" xlink:to="loc_dei_Security12bTitle_019ff1b2-d743-7a63-b159-183f1f456855" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019ff1b2-d743-73a4-ad35-ca25bfc39d8d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ff1b2-d743-74bf-9d03-719de78de308" xlink:to="loc_dei_TradingSymbol_019ff1b2-d743-73a4-ad35-ca25bfc39d8d" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019ff1b2-d743-7eca-ba35-5bbc97718881" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ff1b2-d743-74bf-9d03-719de78de308" xlink:to="loc_dei_SecurityExchangeName_019ff1b2-d743-7eca-ba35-5bbc97718881" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019ff1b2-d743-79b5-8f3c-701335bc7b9d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ff1b2-d743-74bf-9d03-719de78de308" xlink:to="loc_dei_EntityEmergingGrowthCompany_019ff1b2-d743-79b5-8f3c-701335bc7b9d" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019ff1b2-d743-7211-8a82-58b5735d1b66" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ff1b2-d743-74bf-9d03-719de78de308" xlink:to="loc_dei_AmendmentFlag_019ff1b2-d743-7211-8a82-58b5735d1b66" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019ff1b2-d743-709a-952c-1a1034d96d37" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019ff1b2-d743-74bf-9d03-719de78de308" xlink:to="loc_dei_EntityCentralIndexKey_019ff1b2-d743-709a-952c-1a1034d96d37" xlink:type="arc" order="21"/>
  </link:definitionLink>
</link:linkbase>
