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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:01a048a9-294d-7c74-9b53-33987c50b2b4,g:2889475c-9c80-4d95-8779-28ddbdae26d8-->
<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-20261021.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_01a048a9-294d-7196-8ef3-8150bf11583d" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_01a048a9-294d-7b34-b0bb-3648606a2168" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_01a048a9-294d-7196-8ef3-8150bf11583d" xlink:to="loc_dei_DocumentInformationTable_01a048a9-294d-7b34-b0bb-3648606a2168" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_01a048a9-294d-7112-b6dd-d29eba70e411" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_01a048a9-294d-7b34-b0bb-3648606a2168" xlink:to="loc_dei_LegalEntityAxis_01a048a9-294d-7112-b6dd-d29eba70e411" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_01a048a9-294d-7112-b6dd-d29eba70e411_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_01a048a9-294d-7112-b6dd-d29eba70e411" xlink:to="loc_dei_EntityDomain_01a048a9-294d-7112-b6dd-d29eba70e411_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_01a048a9-294d-7ff6-965e-81252672d021" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_01a048a9-294d-7112-b6dd-d29eba70e411" xlink:to="loc_dei_EntityDomain_01a048a9-294d-7ff6-965e-81252672d021" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_01a048a9-294d-7cf0-9541-38378abc3351" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_01a048a9-294d-7b34-b0bb-3648606a2168" xlink:to="loc_us-gaap_StatementClassOfStockAxis_01a048a9-294d-7cf0-9541-38378abc3351" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_01a048a9-294d-7cf0-9541-38378abc3351_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_01a048a9-294d-7cf0-9541-38378abc3351" xlink:to="loc_us-gaap_ClassOfStockDomain_01a048a9-294d-7cf0-9541-38378abc3351_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_01a048a9-294d-7e3d-8b67-311c9b6cd0ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_01a048a9-294d-7cf0-9541-38378abc3351" xlink:to="loc_us-gaap_ClassOfStockDomain_01a048a9-294d-7e3d-8b67-311c9b6cd0ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_01a048a9-294d-7e87-8fa8-4c7e7c1e755e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a048a9-294d-7e3d-8b67-311c9b6cd0ea" xlink:to="loc_us-gaap_CommonStockMember_01a048a9-294d-7e87-8fa8-4c7e7c1e755e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesAPreferredStockMember_01a048a9-294d-715b-a9c5-7915554f211b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeriesAPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a048a9-294d-7e3d-8b67-311c9b6cd0ea" xlink:to="loc_us-gaap_SeriesAPreferredStockMember_01a048a9-294d-715b-a9c5-7915554f211b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_01a048a9-294d-71c8-893f-65fc4d2072d2" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a048a9-294d-7196-8ef3-8150bf11583d" xlink:to="loc_dei_DocumentType_01a048a9-294d-71c8-893f-65fc4d2072d2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_01a048a9-294d-733a-8602-2c009220c2d3" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a048a9-294d-7196-8ef3-8150bf11583d" xlink:to="loc_dei_DocumentPeriodEndDate_01a048a9-294d-733a-8602-2c009220c2d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_01a048a9-294d-79c5-ba3b-88cb11cfff67" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a048a9-294d-7196-8ef3-8150bf11583d" xlink:to="loc_dei_EntityRegistrantName_01a048a9-294d-79c5-ba3b-88cb11cfff67" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_01a048a9-294d-7802-8c01-b911917e48f0" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a048a9-294d-7196-8ef3-8150bf11583d" xlink:to="loc_dei_EntityIncorporationStateCountryCode_01a048a9-294d-7802-8c01-b911917e48f0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_01a048a9-294d-71b5-a9c4-73040420620c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a048a9-294d-7196-8ef3-8150bf11583d" xlink:to="loc_dei_EntityFileNumber_01a048a9-294d-71b5-a9c4-73040420620c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_01a048a9-294d-7d4a-b945-2f9b07b2a046" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a048a9-294d-7196-8ef3-8150bf11583d" xlink:to="loc_dei_EntityTaxIdentificationNumber_01a048a9-294d-7d4a-b945-2f9b07b2a046" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_01a048a9-294d-7126-ad55-fd3a443d7abe" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a048a9-294d-7196-8ef3-8150bf11583d" xlink:to="loc_dei_EntityAddressAddressLine1_01a048a9-294d-7126-ad55-fd3a443d7abe" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_01a048a9-294d-75a6-9570-88bfb910c91c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a048a9-294d-7196-8ef3-8150bf11583d" xlink:to="loc_dei_EntityAddressCityOrTown_01a048a9-294d-75a6-9570-88bfb910c91c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_01a048a9-294d-7e13-88d2-9b9c3bd86a04" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a048a9-294d-7196-8ef3-8150bf11583d" xlink:to="loc_dei_EntityAddressStateOrProvince_01a048a9-294d-7e13-88d2-9b9c3bd86a04" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_01a048a9-294d-7518-8433-8cddf27405eb" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a048a9-294d-7196-8ef3-8150bf11583d" xlink:to="loc_dei_EntityAddressPostalZipCode_01a048a9-294d-7518-8433-8cddf27405eb" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_01a048a9-294d-7f5e-acde-b6ac2ebaca3f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a048a9-294d-7196-8ef3-8150bf11583d" xlink:to="loc_dei_CityAreaCode_01a048a9-294d-7f5e-acde-b6ac2ebaca3f" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_01a048a9-294d-7dbc-ab35-404bd3377512" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a048a9-294d-7196-8ef3-8150bf11583d" xlink:to="loc_dei_LocalPhoneNumber_01a048a9-294d-7dbc-ab35-404bd3377512" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_01a048a9-294d-7262-8209-eed5b9b9ad38" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_WrittenCommunications"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a048a9-294d-7196-8ef3-8150bf11583d" xlink:to="loc_dei_WrittenCommunications_01a048a9-294d-7262-8209-eed5b9b9ad38" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_01a048a9-294d-71b0-9160-e66548dc23e1" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SolicitingMaterial"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a048a9-294d-7196-8ef3-8150bf11583d" xlink:to="loc_dei_SolicitingMaterial_01a048a9-294d-71b0-9160-e66548dc23e1" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_01a048a9-294d-7ec0-82db-ac387e9702f3" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_PreCommencementTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a048a9-294d-7196-8ef3-8150bf11583d" xlink:to="loc_dei_PreCommencementTenderOffer_01a048a9-294d-7ec0-82db-ac387e9702f3" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_01a048a9-294d-702b-847c-91b5c9189811" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a048a9-294d-7196-8ef3-8150bf11583d" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_01a048a9-294d-702b-847c-91b5c9189811" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_01a048a9-294d-786f-b5eb-92446ff57c39" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a048a9-294d-7196-8ef3-8150bf11583d" xlink:to="loc_dei_Security12bTitle_01a048a9-294d-786f-b5eb-92446ff57c39" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_01a048a9-294d-74de-9ebf-21dc2dd32893" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a048a9-294d-7196-8ef3-8150bf11583d" xlink:to="loc_dei_TradingSymbol_01a048a9-294d-74de-9ebf-21dc2dd32893" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_01a048a9-294d-78b1-98fc-a0ac5b99bedc" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a048a9-294d-7196-8ef3-8150bf11583d" xlink:to="loc_dei_SecurityExchangeName_01a048a9-294d-78b1-98fc-a0ac5b99bedc" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_01a048a9-294d-768b-b3be-e87ddda33b1f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a048a9-294d-7196-8ef3-8150bf11583d" xlink:to="loc_dei_EntityEmergingGrowthCompany_01a048a9-294d-768b-b3be-e87ddda33b1f" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_01a048a9-294d-7ec3-82db-7d6a96c435e8" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a048a9-294d-7196-8ef3-8150bf11583d" xlink:to="loc_dei_AmendmentFlag_01a048a9-294d-7ec3-82db-7d6a96c435e8" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_01a048a9-294d-74bb-8b81-a6ea2309b92d" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_01a048a9-294d-7196-8ef3-8150bf11583d" xlink:to="loc_dei_EntityCentralIndexKey_01a048a9-294d-74bb-8b81-a6ea2309b92d" xlink:type="arc" order="21"/>
  </link:definitionLink>
</link:linkbase>
