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DEPOSITS (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Deposits, Interest-bearing and Noninterest-bearing, Alternative [Abstract] |  |
Time deposits included in total brokered deposits | $ 378.1 | $ 7.4
Deposit overdrafts as other commercial/consumer loans | $ 2.2 | $ 1.9

X
- Definition Amount of time deposits included in brokered deposits as of the reporting date. + References No definition available. + Details
Name: | aub_BrokeredTimeDeposits
Namespace Prefix: | aub_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Deposit overdraft. + References No definition available. + Details
Name: | aub_DepositOverdraft
Namespace Prefix: | aub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DepositsInterestBearingAndNoninterestBearingAlternativeAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration