Atlantic Union Bankshares Corporation Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Cover
- Document and Entity Information
Financial Statements
Notes to Financial Statements
Accounting Policies
- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)
Notes Tables
Notes Details

SECURITIES AND OTHER INVESTMENTS (Narrative) (Details)

v3.24.3

SECURITIES AND OTHER INVESTMENTS (Narrative) (Details)	9 Months Ended	12 Months Ended
SECURITIES AND OTHER INVESTMENTS (Narrative) (Details)	Sep. 30, 2024 USD ($) security	Dec. 31, 2023 USD ($) security
Schedule Of Debt Investments [Line Items]
Available for sale securities past due or non-accrual	$ 0	$ 0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	342,329,000	382,167,000
AFS securities in an unrealized loss, credit related impairment	0	0
Available for sale securities, allowance for credit losses	0	0
HTM securities past due or non accrual	0	0
Restricted equity securities consist of Federal Reserve Bank stock	82,900,000	67,000,000.0
Federal Home Loan Bank Stock	$ 35,000,000.0	$ 48,400,000
Restricted equity securities as a percentage of outstanding borrowings, required by FHLB	4.75%	4.75%
Restricted equity securities as a percentage of outstanding borrowings, required by FRB	6.00%	6.00%
Held-to-Maturity Securities
Schedule Of Debt Investments [Line Items]
Accrued interest receivable	$ 6,700,000	$ 8,400,000
Available-for-sale Securities
Schedule Of Debt Investments [Line Items]
Available for sale securities that had been in a continuous loss position for more than 12 months, Number of issues \| security	740	757
Accrued interest receivable	$ 10,300,000	$ 9,500,000
Mortgage-Backed Securities, Issued by Private Enterprises [Member]
Schedule Of Debt Investments [Line Items]
SSFA rating percentage	20.00%	20.00%

- Definition

Debt Securities Available for Sale Nonaccrual.

+ References

No definition available.

+ Details

Name:	aub_DebtSecuritiesAvailableForSaleNonaccrual
Namespace Prefix:	aub_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Debt Securities, Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions.

+ References

No definition available.

+ Details

Name:	aub_DebtSecuritiesAvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
Namespace Prefix:	aub_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings and other comprehensive loss (OCI).

+ References

No definition available.

+ Details

Name:	aub_ImpairmentLossOtherThanTemporaryDebtSecuritiesAvailableForSale
Namespace Prefix:	aub_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Restricted equity securities as a percentage of outstanding borrowings, required by Federal Home Loan Bank.

+ References

No definition available.

+ Details

Name:	aub_RestrictedEquitySecuritiesAsPercentageOfOutstandingBorrowingsRequiredByFederalHomeLoanBank
Namespace Prefix:	aub_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Restricted equity securities as a percentage of outstanding borrowings, required by the Federal Reserve Bank.

+ References

No definition available.

+ Details

Name:	aub_RestrictedEquitySecuritiesAsPercentageOfOutstandingBorrowingsRequiredByFederalReserveBank
Namespace Prefix:	aub_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	aub_ScheduleOfDebtInvestmentsLineItems
Namespace Prefix:	aub_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Simplified supervisory formula approach rating.

+ References

No definition available.

+ Details

Name:	aub_SimplifiedSupervisoryFormulaApproachRating
Namespace Prefix:	aub_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount excluding accrued interest, of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479106/326-30-50-5

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of investment in debt security measured at amortized cost (held-to-maturity) on nonaccrual status.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

+ Details

Name:	us-gaap_DebtSecuritiesHeldToMaturityNonaccrual
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477974/942-325-45-1

+ Details

Name:	us-gaap_FederalHomeLoanBankStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Federal Reserve Bank stock represents an equity interest in the Federal Reserve Bank. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

+ References

+ Details

Name:	us-gaap_FederalReserveBankStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 310
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477802/946-310-45-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(a)(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_InterestReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_InformationByCategoryOfDebtSecurityAxis=us-gaap_HeldtomaturitySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InformationByCategoryOfDebtSecurityAxis=aub_AvailableForSaleDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: