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EMPLOYEE BENEFITS AND STOCK BASED COMPENSATION (Payment Made for Employee Benefit Plans) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Employee Benefits and Share-based Compensation, Noncash [Abstract] |  |  |
401(K) Plan | $ 5,550 | $ 4,592 | $ 3,505
ESOP | 1,163 | 1,005 | 1,255
Cash | 780 | 1,509 | 1,461
Total | $ 7,493 | $ 7,106 | $ 6,221

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- Definition Cash profit sharing bonuses paid to employees. + References No definition available. + Details
Name: | aub_CashProfitSharingBonusesPaidToEmployees
Namespace Prefix: | aub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Total payments made for employee benefits. + References No definition available. + Details
Name: | aub_TotalPaymentsMadeForEmployeeBenefits
Namespace Prefix: | aub_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition This item represents the amount of cash contributions during the period made by the entity to the Employee Stock Ownership Plan (ESOP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
Name: | us-gaap_EmployeeStockOwnershipPlanESOPCashContributionsToESOP
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration