Atlantic Union Bankshares Corporation Quarterly report [Sections 13 or 15(d)]

Quarterly report [Sections 13 or 15(d)]

SUBSEQUENT EVENTS (Narrative) (Details)

SUBSEQUENT EVENTS (Narrative) (Details) $ / shares in Units, $ in Thousands, shares in Millions				1 Months Ended	3 Months Ended						5 Months Ended	9 Months Ended		12 Months Ended
	Oct. 29, 2026 $ / shares	May 05, 2026 USD ($)	Apr. 01, 2025 USD ($) shares	Nov. 03, 2026 USD ($) shares	Sep. 30, 2026 USD ($) $ / shares	Jun. 30, 2026 $ / shares	Mar. 31, 2026 $ / shares	Sep. 30, 2025 $ / shares	Jun. 30, 2025 USD ($) $ / shares	Mar. 31, 2025 $ / shares	Sep. 30, 2026 USD ($) $ / shares shares	Sep. 30, 2026 USD ($) $ / shares	Sep. 30, 2025 USD ($) $ / shares	Dec. 31, 2025 USD ($) $ / shares
Subsequent Event [Line Items]
Dividends on common stock (in dollars per share) \| $ / shares					$ 0.37	$ 0.37	$ 0.37	$ 0.34	$ 0.34	$ 0.34		$ 1.11	$ 1.02
Dividends on preferred stock (in dollars per share) \| $ / shares					171.88	$ 171.88	$ 171.88	$ 171.88	$ 171.88	$ 171.88
Common stock, par value (in dollars per share) \| $ / shares					$ 1.33						$ 1.33	$ 1.33		$ 1.33
Stock repurchase program, number of shares repurchased \| shares											1.8
Stock repurchase program, shares repurchased amount											$ 72,500
Stock repurchase program, remaining authorized repurchase amount					$ 177,500						177,500	$ 177,500
Stock repurchase program, authorized amount		$ 250,000
Stock repurchase program, expiration date		May 05, 2027
Subordinated Debt					$ 690,000						$ 690,000	$ 690,000		$ 608,000
Effective rate, as a percent					3.77%						3.77%	3.77%		3.15%
Basis spread on variable rate												0.262%		0.262%
Net proceeds from issuance of long-term debt												$ 246,801	$ 0
Total assets					$ 38,351,665						$ 38,351,665	38,351,665		$ 37,585,754
Total deposits					30,965,529						30,965,529	$ 30,965,529		30,471,636
Issuance of common stock in regard to acquisition									$ 1,275,247
Sandy Spring
Subsequent Event [Line Items]
Conversion ratio			0.9
Additional shares issued \| shares			41.0
Issuance of common stock in regard to acquisition			$ 1,275,969
Common Stock [Member]
Subsequent Event [Line Items]
Issuance of common stock in regard to acquisition									$ 54,530
Series A Preferred Stock [Member]
Subsequent Event [Line Items]
Number of preferred stock represented by each depositary share												each representing a 1/400th ownership interest in a share of its Series A preferred stock
2036 Subordinated Notes
Subsequent Event [Line Items]
Subordinated Debt					$ 250,000						$ 250,000	$ 250,000
Stated percentage on debt instrument					6.25%						6.25%	6.25%
Basis spread on variable rate					2.13%							0.00%
2029 Subordinated Notes \| Sandy Spring
Subsequent Event [Line Items]
Subordinated Debt					$ 168,000						$ 168,000	$ 168,000		$ 168,000
Stated percentage on debt instrument					6.53%						6.53%	6.53%		6.53%
Basis spread on variable rate														2.62%
2031 Subordinate Notes
Subsequent Event [Line Items]
Subordinated Debt					$ 250,000						$ 250,000	$ 250,000		$ 250,000
Stated percentage on debt instrument					2.88%						2.88%	2.88%		2.88%
Basis spread on variable rate												0.00%		0.00%
Subsequent Event [Member]
Subsequent Event [Line Items]
Stock repurchase program, number of shares repurchased \| shares				1.6
Stock repurchase program, shares repurchased amount				$ 62,500
Stock repurchase program, remaining authorized repurchase amount				$ 115,000
Subsequent Event [Member] \| Common Class A [Member] \| O 2026 Q4 Common Dividends [Member]
Subsequent Event [Line Items]
Dividends on common stock (in dollars per share) \| $ / shares	$ 0.4
Dividends payable, date to be paid	Nov. 27, 2026
Dividends payable, date of record	Nov. 13, 2026
Subsequent Event [Member] \| Depositary Shares \| O 2026 Q4 Preferred Dividends [Member]
Subsequent Event [Line Items]
Dividends on preferred stock (in dollars per share) \| $ / shares	$ 0.43
Subsequent Event [Member] \| Series A Preferred Stock [Member] \| O 2026 Q4 Preferred Dividends [Member]
Subsequent Event [Line Items]
Number of preferred stock represented by each depositary share	each representing a 1/400th ownership interest in a share of Series A preferred stock.
Dividends on preferred stock (in dollars per share) \| $ / shares	$ 171.88
Dividends payable, date declared	Oct. 29, 2026
Dividends payable, date to be paid	Dec. 01, 2026
Dividends payable, date of record	Nov. 16, 2026