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

SUBSEQUENT EVENTS (Narrative) (Details) - $ / shares		3 Months Ended						9 Months Ended
SUBSEQUENT EVENTS (Narrative) (Details) - $ / shares	Oct. 28, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Subsequent Event [Line Items]
Dividends on common stock (in dollars per share)		$ 0.28	$ 0.28	$ 0.25	$ 0.25	$ 0.25	$ 0.25	$ 0.81	$ 0.75
Dividends on preferred stock (in dollars per share)		$ 171.88	$ 171.88	$ 171.88	$ 156.60
Common Stock, Class A \| Subsequent Event
Subsequent Event [Line Items]
Dividends on common stock (in dollars per share)	$ 0.28
Common stock dividend increase in amount per share	$ 0.03
Common stock dividend percentage of increase in amount per share	12.00%
Dividends payable, date declared	Oct. 28, 2021
Dividends payable, date to be paid	Nov. 26, 2021
Dividends payable, date of record	Nov. 12, 2021
Depositary Shares \| Subsequent Event
Subsequent Event [Line Items]
Dividends on preferred stock (in dollars per share)	$ 0.43
Series A Preferred Stock
Subsequent Event [Line Items]
Number of preferred stock represented by each depositary share								The Series A preferred stock is represented by depositary shares, each representing a 1/400th ownership interest in a share of Series A preferred stock
Series A Preferred Stock \| Subsequent Event
Subsequent Event [Line Items]
Dividends on preferred stock (in dollars per share)	$ 171.88
Dividends payable, date to be paid	Dec. 01, 2021
Dividends payable, date of record	Nov. 16, 2021