XML 125 R106.htm IDEA: XBRL DOCUMENT
v3.20.4

EMPLOYEE BENEFITS AND STOCK BASED COMPENSATION (Payment Made for Employee Benefit Plans) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Employee Benefits and Share-based Compensation, Noncash [Abstract] |  |  |
401(K) Plan | $ 6,265 | $ 5,550 | $ 4,592
ESOP | 1,000 | 1,163 | 1,005
Cash | 697 | 780 | 1,509
Total | $ 7,962 | $ 7,493 | $ 7,106

X
- 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

X
- 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

X
- 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

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

X
- 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