XML 46 R34.htm IDEA: XBRL DOCUMENT
v3.25.3

COMMITMENTS AND CONTINGENCIES (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2025
Commitments and Contingencies Disclosure [Abstract] |
Balances of Commitments and Contingencies | The following table presents the balances of commitments and contingencies as of the periods ended (dollars in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2025 |  | December 31, 2024
Commitments with off-balance sheet risk: |  | ​ |  |  | ​ |
Commitments to extend credit(1) | ​ | $ | 9,660,035 | ​ | $ | 5,987,562
Letters of credit | ​ |  | 220,921 | ​ |  | 145,985
Total commitments with off-balance sheet risk | ​ | $ | 9,880,956 | ​ | $ | 6,133,547
(1) Includes unfunded overdraft protection.
Schedule of Pledged Assets, Not Separately Reported on Statement of Financial Position |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pledged Assets as of September 30, 2025 | ​ | ​ | ​
​ |  | ​ | ​ |  | AFS |  | HTM |  | ​ | ​ |  | ​ | ​
​ | ​ | Cash | ​ | Securities (1) | ​ | Securities (1) | ​ | Loans (2) | ​ | Total
Public deposits | ​ | $ | — | ​ | $ | 1,268,275 | ​ | $ | 602,964 | ​ | $ | — | ​ | $ | 1,871,239
Repurchase agreements | ​ |  | — | ​ |  | 149,055 | ​ |  | — | ​ |  | — | ​ |  | 149,055
FHLB advances | ​ |  | — | ​ |  | 541,998 | ​ |  | 9,475 | ​ |  | 8,392,429 | ​ |  | 8,943,902
Derivatives | ​ |  | 110,671 | ​ |  | 64,058 | ​ |  | — | ​ |  | — | ​ |  | 174,729
Federal Reserve Discount Window | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 4,698,212 | ​ | ​ | 4,698,212
Other purposes | ​ |  | — | ​ | ​ | 44,084 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 44,084
Total pledged assets | ​ | $ | 110,671 | ​ | $ | 2,067,470 | ​ | $ | 612,439 | ​ | $ | 13,090,641 | ​ | $ | 15,881,221
(1) Balance represents market value. (2) Balance represents book value. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pledged Assets as of December 31, 2024 | ​ | ​ | ​
​ |  | ​ | ​ |  | AFS |  | HTM |  | ​ | ​ |  | ​ | ​
​ | ​ | Cash | ​ | Securities (1) | ​ | Securities (1) | ​ | Loans (2) | ​ | Total
Public deposits | ​ | $ | — | ​ | $ | 771,486 | ​ | $ | 601,421 | ​ | $ | — | ​ | $ | 1,372,907
Repurchase agreements | ​ |  | — | ​ |  | 93,667 | ​ |  | — | ​ |  | — | ​ |  | 93,667
FHLB advances | ​ |  | — | ​ |  | 579,947 | ​ |  | 9,417 | ​ |  | 4,089,049 | ​ |  | 4,678,413
Derivatives | ​ |  | 134,668 | ​ |  | 62,199 | ​ |  | — | ​ |  | — | ​ |  | 196,867
Federal Reserve Discount Window | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 4,358,701 | ​ | ​ | 4,358,701
Other purposes | ​ |  | — | ​ | ​ | 18,713 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 18,713
Total pledged assets | ​ | $ | 134,668 | ​ | $ | 1,526,012 | ​ | $ | 610,838 | ​ | $ | 8,447,750 | ​ | $ | 10,719,268
(1) Balance represents market value. (2) Balance represents book value.

X
- Definition Commitments and contingencies. + References No definition available. + Details
Name: | aub_CommitmentsAndContingenciesTableTextBlock
Namespace Prefix: | aub_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule of Pledged Assets, Not Separately Reported on Statement of Financial Position [Table Text Block] + References No definition available. + Details
Name: | aub_ScheduleOfPledgedAssetsNotSeparatelyReportedOnStatementOfFinancialPositionTableTextBlock
Namespace Prefix: | aub_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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