<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2023"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:us-gaap="http://fasb.org/us-gaap/2023"
  xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="aub-20230725.xsd" xlink:type="simple"/>
    <context id="Duration_7_25_2023_To_7_25_2023_us-gaap_StatementClassOfStockAxis_us-gaap_SeriesAPreferredStockMember_SzEVvDdXaECXz7ru_vP2mQ">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000883948</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">us-gaap:SeriesAPreferredStockMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-07-25</startDate>
            <endDate>2023-07-25</endDate>
        </period>
    </context>
    <context id="Duration_7_25_2023_To_7_25_2023_us-gaap_StatementClassOfStockAxis_us-gaap_CommonStockMember_EiVLjlouVUa2hjtT1RNvQw">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000883948</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">us-gaap:CommonStockMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-07-25</startDate>
            <endDate>2023-07-25</endDate>
        </period>
    </context>
    <context id="Duration_7_25_2023_To_7_25_2023_fK4O9YJoa0eFpNJkhnxm_g">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000883948</identifier>
        </entity>
        <period>
            <startDate>2023-07-25</startDate>
            <endDate>2023-07-25</endDate>
        </period>
    </context>
    <dei:EntityCentralIndexKey
      contextRef="Duration_7_25_2023_To_7_25_2023_fK4O9YJoa0eFpNJkhnxm_g"
      id="Tc_Q9yLwHdIqk66n4JjlFAIHg_2_1">0000883948</dei:EntityCentralIndexKey>
    <dei:AmendmentFlag
      contextRef="Duration_7_25_2023_To_7_25_2023_fK4O9YJoa0eFpNJkhnxm_g"
      id="Tc_38JUJnivs0-pkjrqo4JAcQ_3_1">false</dei:AmendmentFlag>
    <dei:DocumentType
      contextRef="Duration_7_25_2023_To_7_25_2023_fK4O9YJoa0eFpNJkhnxm_g"
      id="Narr_BQc01GHgAEuYuLz74T44WQ">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate
      contextRef="Duration_7_25_2023_To_7_25_2023_fK4O9YJoa0eFpNJkhnxm_g"
      id="Narr_bEN-X33DV0GnQGTJN1oklQ">2023-07-25</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName
      contextRef="Duration_7_25_2023_To_7_25_2023_fK4O9YJoa0eFpNJkhnxm_g"
      id="Narr_DT3E92BnyUS9LeIIrslyUA">ATLANTIC UNION BANKSHARES CORPORATION</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode
      contextRef="Duration_7_25_2023_To_7_25_2023_fK4O9YJoa0eFpNJkhnxm_g"
      id="Tc_j_FMg8JmCU-Ax-PHaSFTIQ_1_0">VA</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber
      contextRef="Duration_7_25_2023_To_7_25_2023_fK4O9YJoa0eFpNJkhnxm_g"
      id="Tc_Sxj1OY6tlkKCiHkiXgEivw_1_1">001-39325</dei:EntityFileNumber>
    <dei:EntityTaxIdentificationNumber
      contextRef="Duration_7_25_2023_To_7_25_2023_fK4O9YJoa0eFpNJkhnxm_g"
      id="Tc__b1p-4gYQkmjAahx1EmohQ_1_2">54-1598552</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressAddressLine1
      contextRef="Duration_7_25_2023_To_7_25_2023_fK4O9YJoa0eFpNJkhnxm_g"
      id="Narr_UpKIqP9UzkutiJDxEGrSZQ">1051 East Cary Street</dei:EntityAddressAddressLine1>
    <dei:EntityAddressAddressLine2
      contextRef="Duration_7_25_2023_To_7_25_2023_fK4O9YJoa0eFpNJkhnxm_g"
      id="Narr_gDqm-JXAc0i4Lt5xDzFGyg">Suite 1200</dei:EntityAddressAddressLine2>
    <dei:EntityAddressCityOrTown
      contextRef="Duration_7_25_2023_To_7_25_2023_fK4O9YJoa0eFpNJkhnxm_g"
      id="Narr_-dy5BME58UOn1KyE5__4dw">Richmond</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince
      contextRef="Duration_7_25_2023_To_7_25_2023_fK4O9YJoa0eFpNJkhnxm_g"
      id="Narr_8BXKnXlRME2AXbb8SWI7vQ">VA</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode
      contextRef="Duration_7_25_2023_To_7_25_2023_fK4O9YJoa0eFpNJkhnxm_g"
      id="Narr_YHX_1Q6SDk2OgDvB5ApT5Q">23219</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode
      contextRef="Duration_7_25_2023_To_7_25_2023_fK4O9YJoa0eFpNJkhnxm_g"
      id="Narr_cayInzh5jECS16rJ4grC5w">(804)</dei:CityAreaCode>
    <dei:LocalPhoneNumber
      contextRef="Duration_7_25_2023_To_7_25_2023_fK4O9YJoa0eFpNJkhnxm_g"
      id="Narr_8uwv0pSQqUGUmSnjdGIDfw">633-5031</dei:LocalPhoneNumber>
    <dei:WrittenCommunications
      contextRef="Duration_7_25_2023_To_7_25_2023_fK4O9YJoa0eFpNJkhnxm_g"
      id="Tc_Uz62PsjWgk2oVj_ixK17wQ_1_1">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial
      contextRef="Duration_7_25_2023_To_7_25_2023_fK4O9YJoa0eFpNJkhnxm_g"
      id="Tc_xzKPZNFbw0WbWrQklzmWYw_1_1">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer
      contextRef="Duration_7_25_2023_To_7_25_2023_fK4O9YJoa0eFpNJkhnxm_g"
      id="Tc_ZGoJlM8y50SBslMPJv-WyQ_1_1">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer
      contextRef="Duration_7_25_2023_To_7_25_2023_fK4O9YJoa0eFpNJkhnxm_g"
      id="Tc_zMbVOVUPXUeaIakoUvlnNw_1_1">false</dei:PreCommencementIssuerTenderOffer>
    <dei:Security12bTitle
      contextRef="Duration_7_25_2023_To_7_25_2023_us-gaap_StatementClassOfStockAxis_us-gaap_CommonStockMember_EiVLjlouVUa2hjtT1RNvQw"
      id="Tc_s-3ZdcerpUqSJBPojLTKCg_2_0">Common Stock, par value $1.33 per share</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="Duration_7_25_2023_To_7_25_2023_us-gaap_StatementClassOfStockAxis_us-gaap_CommonStockMember_EiVLjlouVUa2hjtT1RNvQw"
      id="Tc_32RLU3vHQEOOtpO61ioDIA_2_2">AUB</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="Duration_7_25_2023_To_7_25_2023_us-gaap_StatementClassOfStockAxis_us-gaap_CommonStockMember_EiVLjlouVUa2hjtT1RNvQw"
      id="Tc_7xqtzXPrDEyzewnPyFq1Hg_2_4">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="Duration_7_25_2023_To_7_25_2023_us-gaap_StatementClassOfStockAxis_us-gaap_SeriesAPreferredStockMember_SzEVvDdXaECXz7ru_vP2mQ"
      id="Tc_fEQRBUplqEmKZ3UZJa19lw_3_0">Depositary Shares, Each Representing a 1/400th Interest in a Share of 6.875% Perpetual Non-Cumulative Preferred Stock, Series A</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="Duration_7_25_2023_To_7_25_2023_us-gaap_StatementClassOfStockAxis_us-gaap_SeriesAPreferredStockMember_SzEVvDdXaECXz7ru_vP2mQ"
      id="Tc_U6ZOA4-p9EKl1VJKikHnrg_3_2">AUB.PRA</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="Duration_7_25_2023_To_7_25_2023_us-gaap_StatementClassOfStockAxis_us-gaap_SeriesAPreferredStockMember_SzEVvDdXaECXz7ru_vP2mQ"
      id="Tc_X2jVW-munUerhX9vjVMlpg_3_4">NYSE</dei:SecurityExchangeName>
    <dei:EntityEmergingGrowthCompany
      contextRef="Duration_7_25_2023_To_7_25_2023_fK4O9YJoa0eFpNJkhnxm_g"
      id="Tc_QwPfV7TgZEqjIBg1I4dUrw_1_1">false</dei:EntityEmergingGrowthCompany>
</xbrl>
