XML 77 R65.htm IDEA: XBRL DOCUMENT
v3.21.2

COMMITMENTS AND CONTINGENCIES (Balances of Commitments and Contingencies) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Commitments with off-balance sheet risk: |  |
Total commitments with off-balance sheet risk | $ 5,946,692 | $ 4,884,239
Commitments to Extend Credit |  |
Commitments with off-balance sheet risk: |  |
Total commitments with off-balance sheet risk | 5,793,342 | 4,722,412
Standby Letters of Credit |  |
Commitments with off-balance sheet risk: |  |
Total commitments with off-balance sheet risk | $ 153,350 | $ 161,827

X
- Definition Commitments with Off Balance Sheet Risk [Abstract] + References No definition available. + Details
Name: | aub_CommitmentsWithOffBalanceSheetRiskAbstract
Namespace Prefix: | aub_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 + Details
Name: | us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |