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)

SECURITIES (Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities
Amortized Cost	$ 873,051	$ 1,075,235
Gross Unrealized Gains	18,313	28,737
Gross Unrealized (Losses)	(2,672)	(1,858)
Estimated Fair Value	888,692	1,102,114
US Government Agencies Debt Securities [Member]
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities
Amortized Cost	8,068	8,313
Gross Unrealized Gains	$ 343	166
Gross Unrealized (Losses)		(25)
Estimated Fair Value	$ 8,411	8,454
Obligations of States and Political Subdivisions [Member]
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities
Amortized Cost	241,655	427,483
Gross Unrealized Gains	8,750	18,885
Gross Unrealized (Losses)	(512)	(721)
Estimated Fair Value	249,893	445,647
Corporate and Other Securities [Member]
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities
Amortized Cost	73,917	78,744
Gross Unrealized Gains	70	244
Gross Unrealized (Losses)	(1,525)	(308)
Estimated Fair Value	72,462	78,680
Mortgage Backed Securities [Member]
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities
Amortized Cost	539,230	550,716
Gross Unrealized Gains	9,122	9,411
Gross Unrealized (Losses)	(635)	(798)
Estimated Fair Value	547,717	559,329
Other Securities [Member]
Amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities
Amortized Cost	10,181	9,979
Gross Unrealized Gains	28	31
Gross Unrealized (Losses)		(6)
Estimated Fair Value	$ 10,209	$ 10,004