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

DERIVATIVES (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
DERIVATIVES (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Carrying Amount of Hedged Asset/(Liabilities)	$ 50,000
Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Unrealized gain within accumulated other comprehensive income, to be reclassified into earnings	1,800
Derivative, amount	0
Fair Value Hedging
Derivatives, Fair Value [Line Items]
Aggregate notional amount of the hedged items	75,900	$ 83,100
Fair value of aggregate notional amount of the hedged items, unrealized loss	5,900	2,000
Loans
Derivatives, Fair Value [Line Items]
Carrying Amount of Hedged Asset/(Liabilities)	75,856	83,078
Cumulative Amount of Basis Adjustments Included in the Carrying Amount of the Hedged Asset/(Liabilities)	5,830	1,972
Available-for-sale Securities
Derivatives, Fair Value [Line Items]
Fair value of aggregate notional amount of the hedged items, unrealized loss	8,000	4,100
Carrying Amount of Hedged Asset/(Liabilities)	179,908	206,799
Cumulative Amount of Basis Adjustments Included in the Carrying Amount of the Hedged Asset/(Liabilities)	7,992	4,072
Available-for-sale Securities \| Fair Value Hedging
Derivatives, Fair Value [Line Items]
Aggregate notional amount of the hedged items	50,000	50,000
Fair value of aggregate notional amount of the hedged items, unrealized loss	$ 8,000	$ 4,100