| Document and Entity Information | Oct. 17, 2019 |
| Document and Entity Information [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Oct. 17, 2019 |
| Entity File Number | 0-20293 |
| Entity Registrant Name | ATLANTIC UNION BANKSHARES CORPORATION |
| Entity Incorporation, State or Country Code | VA |
| Entity Tax Identification Number | 54-1598552 |
| Entity Address, Address Line One | 1051 East Cary Street |
| Entity Address, Adress Line Two | Suite 1200 |
| Entity Address, State or Province | VA |
| Entity Address, City or Town | Richmond |
| Entity Address, Postal Zip Code | 23219 |
| City Area Code | (804) |
| Local Phone Number | 633-5031 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $1.33 per share |
| Trading Symbol | AUB |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000883948 |
| Amendment Flag | false |
