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

SECURITIES (Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Total AFS securities	$ 1,859,349	$ 1,780,952
Gross Unrealized Gains	60,866	9,414
Gross Unrealized (Losses)	(1,356)	(15,545)
Estimated Fair Value	1,918,859	1,774,821
U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Total AFS securities	4,475
Gross Unrealized Gains	15
Gross Unrealized (Losses)	0
Estimated Fair Value	4,490
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Total AFS securities	411,690	466,588
Gross Unrealized Gains	26,935	3,844
Gross Unrealized (Losses)	(12)	(1,941)
Estimated Fair Value	438,613	468,491
Corporate and other bonds
Debt Securities, Available-for-sale [Line Items]
Total AFS securities	224,854	167,561
Gross Unrealized Gains	5,044	1,118
Gross Unrealized (Losses)	(374)	(983)
Estimated Fair Value	229,524	167,696
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Total AFS securities	1,215,263	1,138,034
Gross Unrealized Gains	28,872	4,452
Gross Unrealized (Losses)	(970)	(12,621)
Estimated Fair Value	1,243,165	1,129,865
Other securities
Debt Securities, Available-for-sale [Line Items]
Total AFS securities	3,067	8,769
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	0	0
Estimated Fair Value	$ 3,067	$ 8,769