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	Mar. 31, 2016	Dec. 31, 2015
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	$ 922,870	$ 891,276
Gross Unrealized Gains	20,083	16,661
Gross Unrealized (Losses)	(3,544)	(4,645)
Available for sale securities, Estimated fair value	939,409	903,292
Obligations of States and Political Subdivisions [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	254,851	257,740
Gross Unrealized Gains	11,267	10,479
Gross Unrealized (Losses)	(149)	(140)
Available for sale securities, Estimated fair value	265,969	268,079
Corporate and Other Bonds [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	95,468	77,628
Gross Unrealized Gains	287	55
Gross Unrealized (Losses)	(1,989)	(1,704)
Available for sale securities, Estimated fair value	93,766	75,979
Mortgage Backed Securities [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	561,466	544,823
Gross Unrealized Gains	8,502	6,127
Gross Unrealized (Losses)	(1,406)	(2,779)
Available for sale securities, Estimated fair value	568,562	548,171
Other Securities [Member]
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Amortized Cost	11,085	11,085
Gross Unrealized Gains	27
Gross Unrealized (Losses)		(22)
Available for sale securities, Estimated fair value	$ 11,112	$ 11,063